Prediction of Cadmium uptake by brown rice and derivation of soil–plant transfer models to improve soil protection guidelines |
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| Authors: | PFAM Römkens HY Guo CL Chu TS Liu CF Chiang GF Koopmans |
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| Institution: | 1. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;2. University of the Chinese Academy of Sciences, Beijing 100049, China;3. Southern Methodist University, Dallas, USA;4. Guizhou Normal University, Guiyang 550001, China;5. Guizhou Academy of Environmental Science and Designing, Guiyang 550000, China;6. Agri-Environment Branch, Agri-Food and Biosciences Institute, Belfast, UK;1. Beijing Research Center for Agricultural Standards and Testing, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China;2. Beijing Municipal Key Laboratory of Agriculture Environment Monitoring, Beijing 100097, China;3. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;4. School of Environmental Studies & State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;5. State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong, China |
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| Abstract: | Cadmium (Cd) levels in paddy fields across Taiwan have increased due to emission from industry. To ensure the production of rice that meets food quality standards, predictive models or suitable soil tests are needed to evaluate the quality of soils to be used for rice cropping. Levels of Cd in soil and rice grains were measured in 19 paddy fields across the western plains in Taiwan. Cadmium levels in soil range from less than 0.1 mg kg?1 to 30 mg kg?1. Measured Cd levels in brown rice were predicted very well (R2 > 0.8) based on Cd and Zinc in a 0.01 M CaCl2 extract or a soil–plant transfer model using the reactive soil Cd content, pH, and cation exchange capacity. In contrast to current soil quality standards used in Taiwan, such models are effective in identifying soils where Cd in rice will exceed food quality standards. |
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