Abstract
Widespread pollution of agricultural soil is posing great risks to food safety and human health. The absence of human health-based Generic Assessment Criteria (GAC) for agricultural land means Chinese farmers struggle to manage these risks efficiently and effectively. Cadmium (Cd) and hexachlorocyclohexane (HCH), two of the most concerned contaminants, demonstrate threshold toxicity meaning that background exposure (MDIoral) is considered when deriving soil Generic Assessment Criteria (GAC). The CLEA (Contaminated Land Exposure Assessment) model was used to derive GAC for Cd and HCH that reflect differences in diet and soil characteristics across 19 provinces/cities. For both cadmium and alpha-HCH, Sichuan had the lowest GAC of 0.379 mg kg−1 and 0.0136 mg kg−1, respectively, resulting from its significant high MDIoral values, which are approximately six to nine times larger than the average MDIoral for all the 19 provinces/cities. Jiangxi province had the highest GAC of 1.230 mg kg−1 and 0.0866 mg kg−1, respectively, for cadmium and alpha-HCH, caused by its notable low MDIoral values and low vegetable consumption rate. Human health risk assessment based on regional GAC for Cd revealed that agricultural land with very high to high risks is located in southern China, while very low-risk land is located in northern China. For HCH, alpha- and gamma-HCH pose negligible health risks, but beta-HCH poses some health risk in some of the provinces/cities. When applying the regional GAC for beta-HCH, agricultural land in Beijing and Sichuan posed the highest risk, and those in Heilongjiang and Jiangxi had the lowest risk. This reflects the significant influence of background and vegetable consumption pathway on the GAC. Regional GACs could simplify and speed up risk assessment of agricultural land in different regions of China, by avoiding the need to calculate site-specific assessment criteria, thus saving time and money by avoiding over or under remediation.
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Acknowledgements
The present study was supported by the Jiangsu Provincial Key Laboratory of Environmental Science and Engineering (JSHJZDSYS-202002). Many thanks to the editorial team and the anonymous reviewers for their sincere, constructive and professional comments that helped to improve the quality of this manuscript. Thanks also to Mr. ZHANG Zhimin for his technical assistance with the figures.
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The present study was supported by the Jiangsu Provincial Key Laboratory of Environmental Science and Engineering (JSHJZDSYS-202002).
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Cheng, Y., Nathanail, C.P. Regional human health risk assessment of cadmium and hexachlorocyclohexane for agricultural land in China. Environ Geochem Health 43, 3715–3732 (2021). https://doi.org/10.1007/s10653-021-00868-4
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DOI: https://doi.org/10.1007/s10653-021-00868-4