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| Risk assessment of cadmium contamination of rice using soil available cadmium in paddy fields： Case studies of Guangdong Province， China |
| Received:September 24, 2021 |
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| KeyWord:brown rice;cadmium;available cadmium;extractant;pollution risk;prediction |
| Author Name | Affiliation | E-mail | | CHEN Canming | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | WEI Zebin | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | PENG Jianbing | Guangdong Dongsheng Industrial Group Co. Ltd. & South China Agricultural University-Dongsheng Joint Research and Development Center of Ecological Environment Remediation, Guangzhou 510440, China | | | WU Qitang | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Guangdong Dongsheng Industrial Group Co. Ltd. & South China Agricultural University-Dongsheng Joint Research and Development Center of Ecological Environment Remediation, Guangzhou 510440, China | wuqitang@scau.edu.cn |
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| Abstract: |
| Rice(Oryza sativa L.) is a staple crop in China and has the potential for high accumulation of cadmium(Cd). The Cd in rice can enter the human body through food chain, posing a great threat to human health. To evaluate the Cd contamination risk of rice and safeguard the food safety, the present study was carried out to compare the ability of different extractants to extract available Cd from soil and the ability to reflect Cd content in rice, to establish the best prediction model for Cd accumulation in rice grain and to deduce the risk threshold of soil available Cd. Cd contaminated paddy fields in Shaoguan and Shantou, Guangdong Province, were selected to represent the acid soil region and the neutral soil region, respectively. The paired samples of soil and rice were taken to analyze their Cd content. The results showed that the extraction ability of CaCl2 was lower than that of DTPA for the same soil, and both extractants extracted more Cd from acid soils than from neutral soils. Compared with the total Cd, available Cd index had a better ability to predict Cd content in rice grain. CaCl2 was suitable for the extraction of available Cd from acidic and neutral soils from both regions, while DTPA was only suitable for neutral soils from Shantou but not for acidic soils from Shaoguan. The best prediction models of Cd content in rice were obtained using CaCl2-Cd to fit the linear regression with rice Cd. Based on the calculation of the models, the soil CaCl2-Cd thresholds for Shaoguan early rice(20 cultivars) and late rice(20 cultivars) were about 0.10 mg·kg-1 and 0.05 mg·kg-1, respectively. This study indicates that the prediction method and threshold of rice cadmium based on CaCl2-Cd can guide the safe utilization of Cd contaminated paddy fields in Guangdong Province and serve as a relevant reference for other Cd contaminated areas with acid soils. |
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