The environmental risk threshold (HC5) for Cd remediation in Chinese agricultural soils

文献类型： 外文期刊

第一作者： Qin, Luyao

作者： Qin, Luyao;Yu, Lei;Wang, Meng;Sun, Xiaoyi;Wang, Jing;Liu, Jiaxiao;Chen, Shibao;Qin, Luyao;Wang, Yi;White, Jason C.

作者机构：

关键词： Cadmium; Chemical extraction methods; Species sensitivity distribution (SSD); Hazard concentration for 5% of species (HC5); Remediation standard

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.0； 五年影响因子：7.9 ）

ISSN： 0301-4797

年卷期： 2024 年 362 卷

页码：

收录情况： SCI

摘要： Given the increasing concern over Cd contamination of agricultural soils in China, reducing the availability of the toxic metal has become an important remedial strategy. However, the lack of a unified evaluation framework complicates the assessment of remediation efficiency of different practices. Here, we evaluated the general extraction method (GEM) of available Cd in nine typical soil types by comparing extraction agents, including CaCl2, EDTA, Mehlich-III, HCl and DTPA. The safe grain concentration of different agricultural products from National Food Safety Standards Limits of Contaminants in Food (GB 2762-2022) was then applied to understand soil limited available Cd concentration based on dose -response curves. We also derived environmental risk threshold (HC5) values for Cd remediation in agricultural soils by constructing species sensitivity distribution (SSD) curves. The results showed that Mehlich-III best predicted Cd accumulation in crops (with 76.5% of explanation of grain Cd) and was selected as the GEM of soil available Cd for subsequent analyses. The regression coefficient (R2) of dose -response curves fitting between Cd absorption in crop tissues and soil available Cd extracted by GEM based on 30 different crop species varied from 51.0% to 79.5%, and the derived limit concentration of soil available Cd based on standard GB 2762-2022 was 0.18-0.76 mg -kg- 1. An HC5 of 0.19 mg -kg- 1 was then calculated, meaning that a concentration of available Cd in agricultural soil below 0.19 mg -kg - 1 ensures that 95% of agricultural products meet the quality and safety requirements of standard GB 2762-2022. The prediction model was well verified in the field test, indicating that can correctly estimate the soil available Cd based on the content of Cd in plant. This study provides a robust scientific framework for deriving the risk threshold for Cd remediation in agricultural soils and could be quite useful for establishing soil remediation standards.

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