Heavy Metals in Fresh Apples: A Comprehensive Literature Review

Heavy metals represent a persistent environmental challenge that directly affects the safety of agricultural crops consumed globally. Fresh apples, as one of the world’s most widely consumed fruits, can accumulate potentially toxic metals from soil, water, and atmospheric sources [1]. The presence of heavy metals in apples and other food crops has become a critical public health concern, particularly for vulnerable populations such as children, given the lack of efficient biological excretion mechanisms for these non-biodegradable elements [2]. Consumption of foodstuffs remains the most likely route for human exposure to heavy metals, with fruits contributing significantly to overall dietary intake [3]. Understanding the concentration levels of these contaminants, their sources, and the regulatory framework governing their presence is essential for ensuring the safety of apples and apple products in the global food supply chain.

Why Heavy Metals May Be Present in Apples: Sources and Pathways

Agricultural Practices and Chemical Inputs

Heavy metals accumulate in agricultural soils primarily through anthropogenic sources, which subsequently transfer to apple trees and their fruit through root uptake and foliar deposition. The excessive use of chemical fertilizers and pesticides represents a significant contribution to heavy metal contamination in arable lands [4]. These agrochemical products often contain trace levels of toxic metals that bioaccumulate in soil over multiple growing seasons. Specifically, sulfur-containing fungicides and copper-based pesticides used extensively in apple orchards have been documented to increase copper, lead, and other metal concentrations in vineyard soils, with similar mechanisms likely operating in apple cultivation [5]. Additionally, livestock manures, compost, and sewage sludge-based biosolids—frequently applied as soil amendments in both conventional and organic farming systems—contribute substantial quantities of heavy metals to cultivated soils [4].

Irrigation practices constitute another critical pathway for metal entry into apple production systems. Agricultural soils irrigated with treated and untreated wastewater can experience significant accumulation of cadmium, lead, chromium, and arsenic, which subsequently transfer to edible crops through root uptake pathways [6]. The bioavailability of these metals in soil is strongly influenced by pH, organic matter content, and soil texture, with acidic soils enhancing the mobility and uptake of cadmium and other toxic elements [7].

Natural Geological Sources and Weathering

Beyond anthropogenic sources, heavy metals originate naturally from the weathering of parent rock materials and mineral deposits. Soils derived from metal-rich geological formations naturally contain elevated baseline concentrations of arsenic, cadmium, lead, and mercury [8]. These natural background levels vary considerably by geographic region, with volcanic soils exhibiting particularly high natural concentrations of certain metals [9]. The transfer factor—the ratio of metal concentration in plants to that in soil—varies by metal type, soil properties, and plant species, meaning that even naturally contaminated soils can result in elevated metal accumulation in fruits [10].

Industrial and Atmospheric Deposition

Industrial emissions, mining activities, and vehicular traffic near agricultural areas deposit heavy metals through atmospheric pathways, with subsequent soil and foliar accumulation in apple trees [11]. Lead and other volatile metals released from industrial sources settle on apple leaf surfaces and can be translocated to developing fruit tissues. Proximity to highways and industrialized zones has been associated with elevated fruit metal concentrations, particularly for lead and chromium [12]. Even in non-mining regions, long-term atmospheric deposition from coal combustion, smelting operations, and other industrial processes contributes to environmental heavy metal pools that eventually enter the soil-plant-food chain continuum [13].

Metals Overview in Apples: Prevalence, Sources, and Detection

The primary heavy metals of concern in apples align with those identified as priority contaminants by the European Food Safety Authority and the U.S. Environmental Protection Agency. Research on apples from industrialized regions, such as the Mitrovica area in Kosovo, has documented concentrations of lead, cadmium, chromium, nickel, arsenic, zinc, copper, and iron [14]. The specific patterns of metal accumulation reflect both regional contamination profiles and the relative bioavailability of each metal in local soils.

Heavy Metals in Fresh Apples—Sources, Forms, and Evidence Summary

Evidence Strength Definitions: – Strong: Multiple independent peer-reviewed studies with consistent findings; regulatory agencies have established limits; epidemiological or mechanistic data supports toxicological concerns – Moderate: Several studies document presence; some mechanistic understanding; potential for health effects under chronic exposure – Weak to Moderate: Limited data on occurrence in apples specifically; concern more theoretical or related to other food matrices

Regulatory and Monitoring Framework: U.S. and European Union Standards

European Union Regulations on Heavy Metals in Fruits

The European Union has established comprehensive regulatory limits for heavy metals in food, including apples and apple products, under Commission Regulation (EC) No. 1881/2006 and subsequent amendments. These regulations reflect risk assessments conducted by the European Food Safety Authority (EFSA) and are designed to protect consumer health while maintaining realistic enforcement standards. For lead in fruits (including apples), the EU maximum level is 0.1 mg/kg for fruits intended for direct consumption [18]. For cadmium, the EU distinguishes between leafy vegetables (0.2 mg/kg) and fruits (0.05 mg/kg), reflecting the differential bioaccumulation patterns of different crops [18]. Arsenic levels in fruits are subject to the general maximum contaminant level of 0.15 mg/kg as total arsenic (with ongoing discussions regarding inorganic arsenic-specific limits). Mercury in fruits is regulated at 0.05 mg/kg maximum level.

The EU framework also includes provisions for monitoring and surveillance of fruit products, with member states required to conduct routine testing of agricultural products. Additionally, the regulations account for processed products (juices, purees) by recognizing that concentration or processing factors may affect final contaminant levels relative to fresh fruit [3]. The EFSA periodically issues scientific opinions on acceptable dietary exposures, including tolerable weekly intakes for cadmium and other metals, which inform regulatory updates.

United States FDA and EPA Standards

In the United States, regulatory oversight of heavy metals in food—including apples—falls under the authority of the FDA, with supporting standards from the EPA for drinking water and environmental quality. The FDA’s Guidance for Industry on lead in food sets an action level of 0.1 mg/kg for lead in most foods, aligning with international standards [18]. For cadmium, the FDA has not established a specific action level in fresh produce but recognizes dietary exposure through a Total Diet Study approach, monitoring cadmium concentrations in food categories including fruits [19]. Research on dietary cadmium intake in the U.S. population indicates that average consumption is approximately 4.63 μg/day (or 0.54 μg/kg body weight/week), which is approximately 22% of the FAO/WHO provisional tolerable weekly intake of 2.5 μg/kg body weight/week [19].

Arsenic in food is monitored through FDA surveillance programs, with particular attention to inorganic arsenic as a probable carcinogen. Mercury levels in food are similarly monitored, with FDA action levels established primarily for seafood at 1 mg/kg, though freshwater produce is included in broader monitoring schemes.

The EPA, through the Safe Drinking Water Act, sets maximum contaminant levels (MCLs) for heavy metals in drinking water that indirectly influence apple safety standards, since irrigation water quality affects fruit contamination [20]. These MCLs include 15 μg/L for lead, 5 μg/L for cadmium, 10 μg/L for arsenic, and 2 μg/L for mercury.

Harmonization and Global Context

Both the U.S. and EU regulations are informed by guidance from the Codex Alimentarius Commission, the joint FAO/WHO body that establishes international food safety standards. The Codex standards for lead in fruits are 0.1 mg/kg, for cadmium 0.05 mg/kg, and for arsenic 0.15 mg/kg, providing a harmonized international baseline [11]. Many developing countries adopt Codex standards, while some nations set stricter or more lenient limits depending on regional contamination patterns and risk tolerance.

Apples and apple products (including juice, sauce, and dried apple) typically fall under the regulatory category of “fruits” in both U.S. and EU frameworks. However, apple juice concentrate may be subject to additional scrutiny due to the potential for metal concentration during the processing steps. The implementation of HACCP (Hazard Analysis and Critical Control Points) systems in apple juice production has been particularly important for controlling pathogens and monitoring contaminant levels [21].

Practical Considerations for Consumers: Evidence-Based Risk Minimization

While apples are generally recognized as a safe and nutritious food with respect to heavy metals, particularly in regions with well-regulated agriculture and monitoring systems, consumers can take evidence-based steps to further minimize potential exposure:

Geographic awareness: Apples grown in regions with known industrial contamination, near highways, or downstream from mining areas may carry higher metal burdens. Whenever possible, consumers in developed countries with strong regulatory enforcement (EU, North America, Australia) can reasonably expect lower contaminant levels than fruits from unmonitored regions. Studies have documented that apples from organic farming systems in developed regions show lower heavy metal content than conventional equivalents, primarily due to restricted pesticide/fungicide use and careful management of soil amendments [22].

Cultivar selection: Different apple varieties exhibit differential metal uptake capacity. Research comparing cultivars shows substantial variation in cadmium and lead accumulation [14], though specific cultivar recommendations for heavy metal avoidance are limited. When available, locally-produced apples from certified low-contamination orchards are preferable to imported fruit from countries with minimal regulatory oversight.

Water washing: Simple rinsing with clean water removes surface contamination including dust-borne lead and other atmospheric deposits. This practice is particularly important for apples grown near roadways. While washing does not remove metals that have been translocated into the fruit tissue, it eliminates the external contamination layer [12].

Peeling considerations: For apples with intact skin and grown in regulated agricultural systems, peeling is not necessary and removes beneficial fiber and polyphenol content. However, in high-contamination regions, peeling may modestly reduce dietary metal intake, though metals have already accumulated throughout the fruit tissue [7].

Processed apple products: Apple juice and juice concentrates warrant careful selection. The concentration of metals during juice processing can result in higher per-serving metal levels compared to fresh fruit. Consumers concerned about heavy metal intake should verify that apple juice products have been tested for lead, cadmium, and arsenic and meet applicable regulatory limits.

Varied fruit consumption: Consuming a diverse array of fruits reduces the cumulative dietary heavy metal burden from any single produce item. While apples are typically low in mercury and moderate in lead/cadmium (compared to some vegetables like leafy greens and root crops), dietary diversity remains the most practical risk reduction strategy [3].

Portion control for vulnerable populations: For children and pregnant women—groups with heightened susceptibility to heavy metal toxicity and reduced excretion capacity—moderation of high-metal foods is advisable. However, the documented benefits of fruit consumption far outweigh the risks from heavy metals present at regulatory compliance levels [18].

For consumers with private wells or in areas with aging water infrastructure, irrigation water quality should be periodically tested for heavy metals. Contaminated irrigation water can substantially increase fruit metal concentrations, and water treatment (reverse osmosis, activated carbon filtration) can reduce this exposure pathway [20].

Frequently Asked Questions (FAQs)

Q1: Are apples safe to eat regarding heavy metal contamination?

A1: Yes, apples grown in regulated agricultural systems (U.S., EU, Canada, Australia, etc.) are safe to consume according to scientific consensus and regulatory standards. Heavy metal concentrations in commercially available apples from these regions typically comply with stringent regulatory limits (lead <0.1 mg/kg, cadmium <0.05 mg/kg) [18]. Consumption of apples and other fruits provides substantial health benefits—including fiber, vitamins, and antioxidants—that far outweigh the minimal heavy metal exposure from compliant products. However, apples grown in unmonitored regions near industrial contamination or mining sites may pose elevated risk and should be verified for safety before consumption [12].

Q2: Why are heavy metals found in apples if they’re grown in soil?

A2: Heavy metals enter apple trees and fruit through multiple pathways. Natural weathering of mineral-rich parent rock releases metals into soil that plant roots absorb during uptake of water and essential nutrients [8]. Additionally, agricultural inputs—particularly phosphate fertilizers and pesticides—contain trace metals that accumulate over years of application [4]. Irrigation with contaminated water, atmospheric deposition from industrial or traffic sources, and use of metal-containing soil amendments (sewage sludge, compost) contribute further [6]. The availability of these metals for plant uptake depends on soil pH, organic matter content, and other factors, meaning that even contaminated soils do not necessarily result in unsafe fruit if bioavailability is low [7].

Q3: Should I worry about lead in apple juice?

A3: Apple juice products sold in regulated markets (U.S., EU) are monitored and must comply with regulatory limits for lead, cadmium, arsenic, and other heavy metals [3]. However, the concentration process used in juice production can theoretically increase metal concentrations per unit volume. Consumers concerned about heavy metal exposure should select apple juice products from reputable manufacturers in countries with strict FDA or EFSA enforcement. Apple juice from apples grown in regulated regions and subject to routine testing represents a low-risk product. Fresh whole apples generally contain slightly lower metal levels than concentrated juice on a per-kilogram basis, making whole fruit a reasonable alternative [3].

Q4: Can I reduce heavy metals in apples by washing or peeling?

A4: Washing apples with clean water removes surface dust and environmental contaminants, including some lead and other metals deposited from atmospheric sources—a practice that modestly reduces external contamination [12]. However, washing does not remove metals that have been translocated into the fruit tissue itself through the vascular system during tree growth. Peeling removes the skin layer but does not substantially reduce internal metal concentrations, and it eliminates beneficial dietary fiber. For apples grown in regulated agricultural systems and tested to meet safety standards, washing (without peeling) is a reasonable hygiene practice, though the additional metal reduction is minimal [12].

Q5: Are organic apples safer from heavy metals than conventional apples?

A5: Research comparing organic and conventional apple cultivation systems shows that organic apples often contain lower concentrations of certain heavy metals, particularly lead and cadmium [22]. This difference reflects the restricted use of synthetic pesticides and fungicides (which may contain or accumulate metals) in organic systems, as well as careful management of soil amendments. However, organic apples can still accumulate metals from natural geological sources and atmospheric deposition, particularly in contaminated regions. The primary advantage of organic apples regarding heavy metals is reduced exposure to metals from agricultural chemical inputs, not the elimination of all heavy metal contamination [22]. Certification and regulatory compliance matter more than farming method alone.

Q6: Which heavy metal is the most concerning in apples?

A6: Cadmium and lead are typically the most frequently detected and health-concerning heavy metals in apples, particularly in regions with industrial contamination or acidic soils that enhance bioavailability [7]. Cadmium is classified as a probable human carcinogen by international agencies and bioaccumulates readily in kidney tissue; even low chronic exposure carries health risks [2]. Lead poses particular concern for children’s neurodevelopment and is associated with cognitive deficits and behavioral effects at exposure levels once considered safe [18]. Arsenic, while present in some apples—particularly in regions with natural arsenic-rich geology—is typically at lower concentrations than in rice or certain vegetables [16]. Mercury in apples is rarely of significant concern due to generally low soil availability and limited plant uptake relative to aquatic organisms [2].

Q7: How do apple varieties or growing regions affect heavy metal content?

A7: Apple cultivars show differential capacity for heavy metal accumulation, with some varieties bioaccumulating cadmium and lead more efficiently than others [14]. Geographic location is the primary determinant of heavy metal burden in apples, reflecting local soil geochemistry, agricultural input history, and industrial/traffic proximity. Apples grown in post-industrial areas with long histories of chemical application show higher metal levels than those from rural agricultural regions with minimal industrial activity [11]. Volcanic soils naturally contain higher baseline metal concentrations, while acidic soils enhance the bioavailability of cadmium and other metals for plant uptake [9]. Mountain or cooler-climate regions with less intensive historical agriculture generally produce apples with lower heavy metal levels. Consumers interested in minimizing metal exposure should prioritize apples from regulated regions with transparent testing protocols and established low-contamination profiles [18].

Q8: What are the regulatory limits for heavy metals in apples, and are they adequately protective?

A8: Regulatory limits for heavy metals in apples vary slightly between jurisdictions but follow international guidance. The EU sets lead limits at 0.1 mg/kg for fresh fruits, cadmium at 0.05 mg/kg, and arsenic at 0.15 mg/kg total [18]. The U.S. FDA action level for lead is similarly 0.1 mg/kg. These limits are based on extensive risk assessments considering dietary exposure patterns, bioavailability, susceptible populations (children, pregnant women), and margin of safety factors [18]. The limits are considered adequately protective by regulatory bodies and are regularly reviewed as new scientific evidence emerges. However, some toxicologists argue that cadmium limits could be lower given its carcinogenicity, and ongoing research informs possible future regulatory tightening [18]. In practical terms, regulatory limits set a clear safety threshold; apples complying with these limits are considered safe for the general population and specifically for children when consumed as part of a balanced diet [3].

The findings summarized in this review have direct relevance to the growing role of heavy metal testing and certification in food systems governance. Although regulatory limits established by the European Union, U.S. FDA, and Codex Alimentarius provide a baseline for consumer protection, the literature consistently demonstrates substantial spatial variability in heavy metal accumulation in apples, driven by soil geochemistry, irrigation water quality, atmospheric deposition, and historical agricultural practices. Regulatory compliance alone therefore does not guarantee uniform exposure minimization, particularly for products sourced from regions with heterogeneous contamination profiles or limited surveillance capacity.

Independent heavy metal testing programs address this limitation by shifting the focus from theoretical compliance to verified, lot-specific contaminant data. For apples and apple-derived products, such testing is particularly relevant for cadmium and lead, which exhibit strong bioaccumulation potential and well-documented toxicity at low chronic exposure levels. Certification frameworks that require routine multi-metal testing provide an additional layer of risk control beyond statutory requirements, enabling producers to identify upstream contamination sources and implement targeted mitigation strategies such as soil amendment adjustments, irrigation water treatment, or orchard relocation.

From a public health perspective, certification programs also function as a communication tool, translating complex toxicological and regulatory information into an interpretable signal for consumers, caregivers, and institutional buyers. This is especially salient for infant and child-focused food categories, where cumulative exposure and limited physiological detoxification capacity heighten concern. Transparent certification grounded in independent laboratory verification helps bridge the gap between regulatory thresholds and consumer expectations for precautionary safety.

Finally, the evidence base reviewed here supports certification as a driver of continuous improvement rather than a static compliance exercise. By generating comparable, longitudinal datasets, testing and certification schemes can inform future regulatory refinement, support epidemiological exposure assessments, and incentivize best-in-class agricultural and processing practices. In this context, heavy metal certification emerges not as a substitute for regulation, but as a complementary, data-driven mechanism to strengthen food safety assurance, enhance supply-chain accountability, and reduce preventable dietary exposure to toxic metals in widely consumed fruits such as apples.

Conclusion

Heavy metals in fresh apples represent a manageable environmental health issue in regulated agricultural markets where monitoring and enforcement systems are robust. Lead, cadmium, arsenic, mercury, chromium, nickel, aluminum, and tin can accumulate in apples through multiple pathways including soil contamination, agricultural chemical inputs, irrigation water, and atmospheric deposition. However, comprehensive regulatory frameworks in the U.S., European Union, and other developed nations ensure that commercially available apples meet strict safety standards that protect consumer health. The documented benefits of apple consumption—including fiber, vitamins, and bioactive polyphenols—substantially outweigh the minimal heavy metal exposure from compliant fruit. Consumers in developed markets can confidently consume apples while implementing simple risk-reduction practices such as washing, selecting fruit from regulated regions, and maintaining dietary diversity. For vulnerable populations and in regions with minimal regulatory oversight, more careful product selection and potential verification testing may be warranted. Ongoing monitoring, regulatory evolution informed by scientific evidence, and continued consumer awareness remain essential for maintaining the safety of apples and other food crops in the global food supply.

[1] Camata et al., “Assessing the sources and risks of heavy metals in agricultural soils: A comprehensive review,” International Journal of Innovative Science and Research Technology, 2025.

[2] K. S. din, Y. Abdalbasit, A. Abbady, and N. Saad, “Assessment of toxic heavy metals in commonly consumed foods in egypt and their implications for public health and safety,” Scientific Reports, 2025.

[3] G. Liang, W. Gong, B. Li, J. Zuo, L. Pan, and X. Liu, “Analysis of heavy metals in foodstuffs and an assessment of the health risks to the general public via consumption in beijing, china,” Multidisciplinary Digital Publishing Institute, 2019.

[4] A. Rashid et al., “Heavy metal contamination in agricultural soil: Environmental pollutants affecting crop health,” Agronomy, 2023.

[5] I. Ochmian and R. Malinowski, “Effect of multi-year protection of grapevines with copper pesticides on the content of heavy metals in soil, leaves, and fruit,” Agronomy, 2024.

[6] Z. Parmoozeh, G. Mostafaii, D. Rabbani, H. Akbari, A. Salem, and M. Miranzadeh, “Investigation of heavy metal concentrations (lead, cadmium, and arsenic) in vegetables irrigated with synthetic effluent and well water: Risk assessment of carcinogenicity and non-carcinogenicity,” Environmental Health Engineering and Management, 2024.

[7] Dr. B. Alkali et al., “Health risk associated with heavy metals contamination in soil and rice: A quantitative assessment of non-carcinogenic and carcinogenic risk,” Journal of Biotechnology and Agricultural Research, 2025.

[8] H. I. Mohamed et al., “Heavy metals toxicity in plants: Understanding mechanisms and developing coping strategies for remediation: A review,” Bioresources and Bioprocessing, 2025.

[9] L. Tang et al., “Soil geochemical controls on heavy metal(loid) accumulation in tuber crops from basalt-derived soils and associated dietary intake health risks on hainan island, china,” Toxics, 2025.

[10] B. Alhogbi, S. A. Al-Ansari, and M. El-Shahawi, “A comparative study on the bioavailability and soil-to-plant transfer factors of potentially toxic element contamination in agricultural soils and their impacts: A case study of dense farmland in the western region of saudi arabia,” Processes, 2023.

[11] R. R. P. Kaushik, V. Kumar, H. D. Bhartiya, A. Dhaka, and G. K. Ahirwar, “A systematic review of heavy metal contamination and human health risk assessment in soils and vegetables of jhansi, bundelkhand region, india,” International Journal of Plant &amp; Soil Science, 2025.

[12] A. K. Iyabode, O. F. Olusegun, T. Taofik, and A. H. Folasade, “Evaluation of heavy metal contamination in apple, orange, and watermelon retailed along roadsides in okinni, egbedore local government, osun state, nigeria,” Asian Journal of Research in Crop Science, 2024.

[13] A. Abdullahi, M. Lawal, and A. M. Salisu, “Heavy metals in contaminated soil: Source, accumulation, health risk and remediation process,” Bayero Journal of Pure and Applied Sciences, 2021.

[14] R. Imeri, “CONCENTRATIONS OF HEAVY METALS OF IN APPLE FRUITS AROUND THE INDUSTERIAL AREA OF MITROVICA , KOSOVO,” None, 2019.

[15] M. Munir, A. Ghafoor, N. Alqahtani, and Z. Iqbal, “Comparative assessment of heavy metals contamination in selected date palm cultivars and its significance for food safety,” Pakistan journal of botany, 2024.

[16] A. Nowar, Md. H. Islam, S. Islam, A. Jubayer, and M. Nayan, “A systematic review on heavy metals contamination in bangladeshi vegetables and their associated health risks,” Frontiers in Environmental Science, 2024.

[17] Q. Li, Z. Han, Y. Tian, H. Xiao, and M. Yang, “Risk assessment of heavy metal in farmlands and crops near PbZn mine tailing ponds in niujiaotang, china,” Toxics, 2023.

[18] E. F. S. Authority, “Lead dietary exposure in the european population,” Wiley, 2012.

[19] K. Kim, M. M. Melough, T. M. Vance, H. Noh, S. I. Koo, and O. K. Chun, “Dietary cadmium intake and sources in the US,” Multidisciplinary Digital Publishing Institute, 2018.

[20] G. Zakir-Hassan, L. J. Baumgartner, C. Allan, J. Punthakey, and H. Rasheed, “Risk assessment of heavy metals in groundwater for a managed aquifer recharge project,” Water, 2025.

[21] S. Duan et al., “Implementation of the HACCP system for apple juice concentrate based on patulin prevention and control,” Multidisciplinary Digital Publishing Institute, 2023.

[22] S. Nithya et al., “Comparing heavy metals, nutritional value, and toxicity in organic vs conventional moringa oleifera leaves from chennai district,” Journal of Natural Remedies, 2025.

[1]  Camata et al., “Assessing the Sources and Risks of Heavy Metals in Agricultural Soils: A Comprehensive Review,” International Journal of Innovative Science and Research Technology, Apr. 2025, doi: 10.38124/ijisrt/25mar1849.

[2]  K. S. Din, Y. Abdalbasit, A. Abbady, and N. Saad, “Assessment of toxic heavy metals in commonly consumed foods in Egypt and their implications for public health and safety,” Scientific Reports, Dec. 2025, doi: 10.1038/s41598-025-27798-w.

[3]  G. Liang, W. Gong, B. Li, J. Zuo, L. Pan, and X. Liu, “Analysis of Heavy Metals in Foodstuffs and an Assessment of the Health Risks to the General Public via Consumption in Beijing, China,” Multidisciplinary Digital Publishing Institute, Mar. 2019, doi: https://doi.org/10.3390/ijerph16060909.

[4]  A. Rashid et al., “Heavy Metal Contamination in Agricultural Soil: Environmental Pollutants Affecting Crop Health,” Agronomy, May 2023, doi: 10.3390/agronomy13061521.

[5]  I. Ochmian and R. Malinowski, “Effect of Multi-Year Protection of Grapevines with Copper Pesticides on the Content of Heavy Metals in Soil, Leaves, and Fruit,” Agronomy, Jul. 2024, doi: 10.3390/agronomy14081677.

[6]  Z. Parmoozeh, G. Mostafaii, D. Rabbani, H. Akbari, A. Salem, and M. Miranzadeh, “Investigation of heavy metal concentrations (lead, cadmium, and arsenic) in vegetables irrigated with synthetic effluent and well water: Risk assessment of carcinogenicity and non-carcinogenicity,” Environmental Health Engineering and Management, Aug. 2024, doi: 10.34172/ehem.2024.32.

[7]  Dr. B. Alkali et al., “Health Risk Associated with Heavy Metals Contamination in Soil and Rice: A Quantitative Assessment of Non-Carcinogenic and Carcinogenic Risk,” Journal of Biotechnology and Agricultural Research, Dec. 2025, doi: 10.70382/ajbar.v10i1.014.

[8]  H. I. Mohamed et al., “Heavy metals toxicity in plants: understanding mechanisms and developing coping strategies for remediation: a review,” Bioresources and Bioprocessing, Sep. 2025, doi: 10.1186/s40643-025-00930-4.

[9]  L. Tang et al., “Soil Geochemical Controls on Heavy Metal(loid) Accumulation in Tuber Crops from Basalt-Derived Soils and Associated Dietary Intake Health Risks on Hainan Island, China,” Toxics, Dec. 2025, doi: 10.3390/toxics14010048.

[10]  B. Alhogbi, S. A. Al-Ansari, and M. El-Shahawi, “A Comparative Study on the Bioavailability and Soil-to-Plant Transfer Factors of Potentially Toxic Element Contamination in Agricultural Soils and Their Impacts: A Case Study of Dense Farmland in the Western Region of Saudi Arabia,” Processes, Aug. 2023, doi: 10.3390/pr11092515.

[11]  R. R. P. Kaushik, V. Kumar, H. d Bhartiya, A. Dhaka, and G. k Ahirwar, “A Systematic Review of Heavy Metal Contamination and Human Health Risk Assessment in Soils and Vegetables of Jhansi, Bundelkhand Region, India,” International Journal of Plant & Soil Science, Nov. 2025, doi: 10.9734/ijpss/2025/v37i115823.

[12]  A. K. Iyabode, O. F. Olusegun, T. Taofik, and A. H. Folasade, “Evaluation of Heavy Metal Contamination in Apple, Orange, and Watermelon Retailed Along Roadsides in Okinni, Egbedore Local Government, Osun State, Nigeria,” Asian Journal of Research in Crop Science, Feb. 2024, doi: 10.9734/ajrcs/2024/v9i1255.

[13]  A. Abdullahi, M. Lawal, and A. M. Salisu, “Heavy metals in contaminated soil: source, accumulation, health risk and remediation process,” Bayero Journal of Pure and Applied Sciences, Dec. 2021, doi: 10.4314/bajopas.v14i1.1.

[14]  R. Imeri, “CONCENTRATIONS OF HEAVY METALS OF IN APPLE FRUITS AROUND THE INDUSTERIAL AREA OF MITROVICA , KOSOVO,” None, Mar. 2019, doi: https://doi.org/10.36103/ijas.v50i1.291.

[15]  M. Munir, A. Ghafoor, N. Alqahtani, and Z. Iqbal, “Comparative assessment of heavy metals contamination in selected date palm cultivars and its significance for food safety,” Pakistan journal of botany, Aug. 2024, doi: 10.30848/pjb2025-1(30).

[16]  A. Nowar, Md. H. Islam, S. Islam, A. Jubayer, and M. Nayan, “A systematic review on heavy metals contamination in Bangladeshi vegetables and their associated health risks,” Frontiers in Environmental Science, Aug. 2024, doi: 10.3389/fenvs.2024.1425286.

[17]  Q. Li, Z. Han, Y. Tian, H. Xiao, and M. Yang, “Risk Assessment of Heavy Metal in Farmlands and Crops Near PbZn Mine Tailing Ponds in Niujiaotang, China,” Toxics, Jan. 2023, doi: 10.3390/toxics11020106.

[18]  E. F. S. Authority, “Lead dietary exposure in the European population,” Wiley, Jul. 2012, doi: https://doi.org/10.2903/j.efsa.2012.2831.

[19]  K. Kim, M. M. Melough, T. M. Vance, H. Noh, S. I. Koo, and O. K. Chun, “Dietary Cadmium Intake and Sources in the US,” Multidisciplinary Digital Publishing Institute, Dec. 2018, doi: https://doi.org/10.3390/nu11010002.

[20]  G. Zakir-Hassan, L. J. Baumgartner, C. Allan, J. Punthakey, and H. Rasheed, “Risk Assessment of Heavy Metals in Groundwater for a Managed Aquifer Recharge Project,” Water, Oct. 2025, doi: 10.3390/w17213092.

[21]  S. Duan et al., “Implementation of the HACCP System for Apple Juice Concentrate Based on Patulin Prevention and Control,” Multidisciplinary Digital Publishing Institute, Feb. 2023, doi: https://doi.org/10.3390/foods12040786.

[22]  S. Nithya et al., “Comparing Heavy Metals, Nutritional Value, and Toxicity in Organic vs Conventional Moringa oleifera Leaves from Chennai District,” Journal of Natural Remedies, Apr. 2025, doi: 10.18311/jnr/2025/45483.