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Soil threshold values of total and available cadmium for vegetable growing based on field data in Guangdong province, South China

Authors

  • Fang Fang Sun,

    1. Research Centre for Quality, Safety and Standard of Agricultural Products, Guangdong Academy of Agricultural Sciences, Guangzhou, China
    2. Supervision and Testing Center for Vegetable and Fruit Quality, Ministry of Agriculture, Guangzhou, China
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  • Fu Hua Wang,

    Corresponding author
    1. Supervision and Testing Center for Vegetable and Fruit Quality, Ministry of Agriculture, Guangzhou, China
    • Research Centre for Quality, Safety and Standard of Agricultural Products, Guangdong Academy of Agricultural Sciences, Guangzhou, China
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  • Xu Wang,

    1. Research Centre for Quality, Safety and Standard of Agricultural Products, Guangdong Academy of Agricultural Sciences, Guangzhou, China
    2. Supervision and Testing Center for Vegetable and Fruit Quality, Ministry of Agriculture, Guangzhou, China
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  • Wu He,

    1. Research Centre for Quality, Safety and Standard of Agricultural Products, Guangdong Academy of Agricultural Sciences, Guangzhou, China
    2. Supervision and Testing Center for Vegetable and Fruit Quality, Ministry of Agriculture, Guangzhou, China
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  • Dian Wen,

    1. Research Centre for Quality, Safety and Standard of Agricultural Products, Guangdong Academy of Agricultural Sciences, Guangzhou, China
    2. Supervision and Testing Center for Vegetable and Fruit Quality, Ministry of Agriculture, Guangzhou, China
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  • Qi Feng Wang,

    1. Research Centre for Quality, Safety and Standard of Agricultural Products, Guangdong Academy of Agricultural Sciences, Guangzhou, China
    2. Supervision and Testing Center for Vegetable and Fruit Quality, Ministry of Agriculture, Guangzhou, China
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  • Xiang Xiang Liu

    1. Research Centre for Quality, Safety and Standard of Agricultural Products, Guangdong Academy of Agricultural Sciences, Guangzhou, China
    2. Supervision and Testing Center for Vegetable and Fruit Quality, Ministry of Agriculture, Guangzhou, China
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Correspondence to: Fu Hua Wang, Research Centre for Quality, Safety and Standard of Agricultural Products, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China. E-mail: wfhwqs@163.com

Abstract

BACKGROUND

Human exposure to cadmium (Cd) is largely attributed to consumption of vegetables grown in polluted soils. In China, guidelines set for Cd in soils are uniform for different crops and diverse soil types, but not risk based. A high-density sampling of 711 paired soil and vegetables was carried out across Guangdong, South China. We aimed to model the transfer of Cd from soil to leafy, rootstalk and fruit vegetables, and to set regional guidelines of Cd [total and diethylenetriaminepentaacetic acid (DTPA) -extractable] in soil for vegetable safe production.

RESULTS

Both total and DTPA-extractable Cd concentrations in soil were good predictors for Cd in vegetables. The transfer of Cd in soil to vegetables could be estimated by nonlinear models, with better fit when using DTPA-extractable Cd than total Cd in soil. The calculated thresholds of soil total Cd were 2.42, 0.94 and 1.57 mg kg−1 whereas those of soil DTPA-extractable Cd were 1.08, 0.33 and 0.63 mg kg−1 for leafy, rootstalk and fruit vegetable fields in Guangdong, respectively, all higher than the national soil Cd threshold.

CONCLUSION

Cadmium-contaminated risk for vegetable production in Guangdong province might have been over-estimated according to the Chinese Environmental Quality Standard for Soil. © 2013 Society of Chemical Industry

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