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| Applicability of risk screening values for soil contamination of agricultural land in evaluation and classification of cadmium-contaminated rice producing areas |
| Received:February 19, 2019 |
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| KeyWord:rice;cadmium;influencing factors;origin classification |
| Author Name | Affiliation | E-mail | | WANG Zu-guang | Key Laboratory of Environmental Factors Control of Agro-protuct Quality Safety, MARA, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHOU Qi-wen | Key Laboratory of Environmental Factors Control of Agro-protuct Quality Safety, MARA, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | caezhouqiwen@126.com | | ZHAO Yu-jie | Key Laboratory of Environmental Factors Control of Agro-protuct Quality Safety, MARA, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | yujiezhao@126.com | | LIU Xiao-wei | Key Laboratory of Environmental Factors Control of Agro-protuct Quality Safety, MARA, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Tie-liang | Key Laboratory of Environmental Factors Control of Agro-protuct Quality Safety, MARA, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Xia-hui | Chinese Academy of Environmental Planning, Beijing 100012, China | | | LI Zhi-tao | Chinese Academy of Environmental Planning, Beijing 100012, China | |
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| Abstract: |
| Risk screening values for soil contamination of agricultural land are fundamental for the assessment and classification of soil environmental quality. However, owing to the complexity of the accumulation and enrichment of soil pollutants in crops, the evaluation of soil environmental quality and the classification of safety utilization categories of agricultural land based on the risk screening values for soil contamination are difficult to reflect the actual conditions in some regions. In the current study, Cd in paddy soils as a typical pollutant and the non-correspondence exceeding standard(misjudgment rate)between Cd concentrations in soils and rice samples as the decision parameter were used to investigate the applicability of the risk screening values in environmental quality assessment and classification of rice producing areas based on Cd concentrations in corresponding soil and rice samples in typical rice producing areas in China. The results showed that there were errors in the evaluation of environmental quality of rice producing areas using the risk screening values for the Chang-Zhu-Tan of Hunan Province and the northern area of Guangdong Province. In the high misjudgment area, the key factors affecting the accumulation of Cd in rice samples were screened by field sampling multi-parameter analysis and mixed linear modeling. It was observed that besides total Cd concentrations and pH values of soils, the concentration of Ca in soils had an important influence on Cd enrichment in rice samples. In order to avoid misjudgments, future studies should focus on the areas with high misjudgment rates based on risk screening values and other critical factors of soils. |
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