Wastewater-Irrigated Vegetables Are a Significant Source of Heavy Metal Contaminants: Toxicity and Health Risks

Water contaminated with heavy metals constitutes an important threat. This threat is a real problem with a negative impact in some developing countries where untreated industrial effluents are used for irrigation. The present study examines heavy metals in wastewater-irrigated vegetables (apple gourd, spinach, cauliflower, sponge gourd, and coriander) water, and soil from Chenab Nagar, Chiniot, Pakistan. In particular, the metals quantified were cadmium (Cd), chromium (Cr), cobalt (Co), nickel (Ni), lead (Pb), and manganese (Mn). Among them, Cr and Co in crops irrigated -wastewater exceeded the levels recommended by the World Health Organization (WHO). In contrast, Ni, Cu, Pb, and Mn concentrations were in line with WHO standards. Compared with the limits established by the Food and Agriculture Organization of the United Nations (FAO), all the study vegetables presented higher (thus unsafe) concentrations of Cd (0.38 to 1.205 mg/Kg). There were also unsafe concentrations of Cr in coriander, sponge gourd, and cauliflower. Pb was found at an unsafe concentration (0.59 mg/Kg) in cauliflower. Conversely, Ni and Mn concentrations were below the maximum permissible limits by WHO, and FAO in all of the analyzed samples. The contamination load index (CLI) in soil, bioconcentration factor (BCF) in plants, daily intake of metals (DIM), and health risk index (HRI) have also been evaluated to estimate the potential risk to human health in that area. We have found an important risk of transitions of Pb, Cd, Cr, and Co from water/soil to the edible part of the plant. The highest HRI value associated with Cd (6.10–13.85) followed by Cr (1.25–7.67) for all vegetable samples presented them as high health risk metal contaminants. If the issue is not addressed, consumption of wastewater-irrigated vegetables will continue posing a health risk.

[1]  S. Wabaidur,et al.  Date pits waste as a solid phase extraction sorbent for the analysis of lead in wastewater and for use in manufacturing brick: An eco-friendly waste management approach , 2022, Journal of Saudi Chemical Society.

[2]  Youyong Zhu,et al.  Multi-Element Analysis and Origin Discrimination of Panax notoginseng Based on Inductively Coupled Plasma Tandem Mass Spectrometry (ICP-MS/MS) , 2022, Molecules.

[3]  S. Wabaidur,et al.  Heavy Metal Ions Removal from Aqueous Solutions by Treated Ajwa Date Pits: Kinetic, Isotherm, and Thermodynamic Approach , 2022, Polymers.

[4]  Nan Wang,et al.  Ratiometric G-Quadruplex Assay for Robust Lead Detection in Food Samples , 2021, Biosensors.

[5]  S. Wabaidur,et al.  Removal of Chromium(III) and Cadmium(II) Heavy Metal Ions from Aqueous Solutions Using Treated Date Seeds: An Eco-Friendly Method , 2021, Molecules.

[6]  M. Azam,et al.  Blueberry, raspberry, and strawberry extracts reduce the formation of carcinogenic heterocyclic amines in fried camel, beef and chicken meats , 2021 .

[7]  N. Ahmad,et al.  Heavy Metals in Acrylic Color Paints Intended for the School Children Use: A Potential Threat to the Children of Early Age , 2021, Molecules.

[8]  Ruijie Deng,et al.  Label-free DNAzyme assays for dually amplified and one-pot detection of lead pollution. , 2020, Journal of hazardous materials.

[9]  Renald Blundell,et al.  Heavy metal pollution in the environment and their toxicological effects on humans , 2020, Heliyon.

[10]  I. Ugulu.  Effect of Wastewater Irrigation on Trace Metal Accumulation in Spinach (Spinacia oleracea L.) and Human Health Risk , 2020, Pakistan Journal of Analytical & Environmental Chemistry.

[11]  M. Naushad,et al.  Cooking with elaborate recipes can reduce the formation of mutagenic heterocyclic amines and promote co-mutagenic amines , 2019, Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment.

[12]  O. Orisakwe,et al.  Heavy Metal Mixture Exposure and Effects in Developing Nations: An Update , 2018, Toxics.

[13]  A. B. Duwiejuah,et al.  Health risk assessment and heavy metal contamination levels in vegetables from Tamale Metropolis, Ghana , 2018, International Journal of Food Contamination.

[14]  P. Lazor,et al.  The Transfer of Heavy Metals from Contaminated Soils into Agricultural Plants in High Tatras Region , 2018 .

[15]  S. Wabaidur,et al.  Determination of heavy metals in skin-whitening cosmetics using microwave digestion and inductively coupled plasma atomic emission spectrometry. , 2017, IET nanobiotechnology.

[16]  Biao Huang,et al.  Heavy metals in intensive greenhouse vegetable production systems along Yellow Sea of China: Levels, transfer and health risk. , 2017, Chemosphere.

[17]  Daniel G. Brown,et al.  SimiVal, a multi-criteria map comparison tool for land-change model projections , 2016, Environ. Model. Softw..

[18]  Ashita Sharma,et al.  Heavy metals in vegetables: screening health risks involved in cultivation along wastewater drain and irrigating with wastewater , 2016, SpringerPlus.

[19]  Mar Edo,et al.  Assessment of chemical and material contamination in waste wood fuels--A case study ranging over nine years. , 2016, Waste management.

[20]  A. Chopra,et al.  Accumulation of heavy metals in the vegetables grown in wastewater irrigated areas of Dehradun, India with reference to human health risk , 2015, Environmental Monitoring and Assessment.

[21]  S. Giri,et al.  Human health risk assessment via drinking water pathway due to metal contamination in the groundwater of Subarnarekha River Basin, India , 2015, Environmental Monitoring and Assessment.

[22]  M. R. Khan.  Influence of food condiments on the formation of carcinogenic heterocyclic amines in cooked chicken and determination by LC-MS/MS , 2015, Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment.

[23]  K. Ahmad,et al.  Heavy Metals Uptake by Cucurbita maxima Grown in Soil Contaminated with Sewage Water and its Human Health Implications in Peri-urban Areas of Sargodha City , 2015 .

[24]  Guo-Wei Chen,et al.  Research progress of natural antioxidants in foods for the treatment of diseases , 2014 .

[25]  K. Narayan,et al.  Do We Produce Enough Fruits and Vegetables to Meet Global Health Need? , 2014, PloS one.

[26]  Riffat Naseem Malik,et al.  Human health risk assessment of heavy metals via consumption of contaminated vegetables collected from different irrigation sources in Lahore, Pakistan , 2014 .

[27]  Zakaria Mennane,et al.  Evaluation of heavy metals pollution in groundwater, soil and some vegetables irrigated with wastewater in the Skhirat region "Morocco" , 2014 .

[28]  B. Van der Bruggen,et al.  Toxicological assessment of heavy metals accumulated in vegetables and fruits grown in Ginfel river near Sheba Tannery, Tigray, Northern Ethiopia. , 2013, Ecotoxicology and environmental safety.

[29]  Yonglong Lu,et al.  Heavy metals in agricultural soils and crops and their health risks in Swat District, northern Pakistan. , 2013, Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association.

[30]  B. Pilarczyk,et al.  Roe and red deer as bioindicators of heavy metals contamination in north-western Poland , 2013 .

[31]  A. Shetty,et al.  Vegetables as Sources of Antioxidants , 2013 .

[32]  Khairia M. Al-qahtani,et al.  Assessment of some heavy metals in vegetables, cereals and fruits in Saudi Arabian markets , 2012 .

[33]  P. Bennekou,et al.  Cobalt uptake and binding in human red blood cells. , 2011, Blood cells, molecules & diseases.

[34]  Md. Abdul Goni,et al.  Heavy metal contamination in water, soil, and vegetables of the industrial areas in Dhaka, Bangladesh , 2010, Environmental monitoring and assessment.

[35]  Yong-guan Zhu,et al.  Health risks of heavy metals in contaminated soils and food crops irrigated with wastewater in Beijing, China. , 2008, Environmental pollution.

[36]  A. Maleki,et al.  Heavy metals in selected edible vegetables and estimation of their daily intake in Sanandaj, Iran. , 2008, The Southeast Asian journal of tropical medicine and public health.

[37]  Sutapa Bose,et al.  Heavy metal accumulation in wheat plant grown in soil amended with industrial sludge. , 2008, Chemosphere.

[38]  P. Sinha,et al.  Alteration in uptake and translocation of essential nutrients in cabbage by excess lead. , 2006, Chemosphere.

[39]  M. A. Radwan,et al.  Market basket survey for some heavy metals in Egyptian fruits and vegetables. , 2006, Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association.

[40]  R. Sharma,et al.  Heavy Metal Contamination in Vegetables Grown in Wastewater Irrigated Areas of Varanasi, India , 2006, Bulletin of environmental contamination and toxicology.

[41]  Jing-zhu Zhao,et al.  Impacts of sewage irrigation on heavy metal distribution and contamination in Beijing, China. , 2005, Environment international.

[42]  Yu-Jing Cui,et al.  Transfer of metals from soil to vegetables in an area near a smelter in Nanning, China. , 2004, Environment international.

[43]  Lars Jarup,et al.  Hazards of heavy metal contamination. , 2003 .

[44]  M. Nobili,et al.  Analysis of intercellular cadmium forms in roots and leaves of bush bean , 1996 .

[45]  R. Chaney,et al.  Interactions of plant zinc and plant species on the bioavailability of plant cadmium to Japanese quail fed lettuce and spinach. , 1992, Environmental research.

[46]  F. Shridi,et al.  Screening of the influence of flavonoids on lipoxygenase and cyclooxygenase activity, as well as on nonenzymic lipid oxidation. , 1988, Polish journal of pharmacology and pharmacy.

[47]  G. Chuah,et al.  The uptake of cadmium by Brassica chinensis and its effect on plant zinc and iron distribution , 1984 .

[48]  N. Lepp,et al.  Effect of Heavy Metal Pollution on Plants , 1981 .

[49]  M. K. John,et al.  Cadmium contamination of soil and its uptake by oats , 1972 .