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| Screening and evaluation of soil cadmium extraction methods for predicting cadmium accumulation in rice |
| Received:March 10, 2020 |
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| KeyWord:rice;cadmium (Cd);bioavailability;diffusion gradient in thin-film(DGT) |
| Author Name | Affiliation | E-mail | | E Qian | Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Agro-environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHAO Yu-jie | Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Agro-environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | yujiezhao@126.com | | LIU Xiao-wei | Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Agro-environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LI Zhi-tao | Technical Center for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China | | | ZHANG Chuang-chuang | Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Agro-environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SUN Yang | Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Agro-environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHOU Qi-wen | Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Agro-environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | caezhouqiwen@126.com | | LIANG Xue-feng | Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Agro-environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Hai-hua | Linyi Natural Resources and Planing Bureau, Linyi 276000, China | |
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| Abstract: |
| Screening of extraction methods for available Cd in soils and establishing prediction models for Cd accumulation in rice are essential for assessing and classifying soil environmental quality. In this study, a total of 140 pairs of brown rice and soil samples were collected from Cd-contaminated paddy fields in the Changsha-Zhuzhou-Xiangtan area in Hunan Province. Total Cd concentrations in the soils and soil solutions, concentrations determined via chemical extraction methods using acetic acid (HAc), composite organic acid, ethylene diamine tetraacetic acid (EDTA), and CaCl2, respectively, and available fraction analyzed via diffusion gradient in thin-film (DGT)technology were obtained and used to establish soil-rice Cd accumulation models. The results indicated the Cd pollution risk for soil and rice in the study region. The Cd concentration extracted using EDTA was significantly correlated with total soil Cd content (R2=0.908 4). False rates of predicting rice Cd concentration using total soil Cd content were 37.2%~39.8%. The performance of the prediction model was significantly concentration-dependent for the CaCl2 extraction method, with a low determination coefficient (R2=0.006)for concentrations of 0.04~0.13 mg·kg-1 compared to that for the other concentrations. However, DGT technology proved to be a better tool for extracting available Cd to establish the prediction models (R2=0.585 4, 0.900 9)for rice Cd accumulation than chemical extraction methods were as well as for distinguishing the effect of the soil bank supply capacity on Cd enrichment by rice. |
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