1. Tianjin Geological Mineral Test Center,Tianjin 300191,China 2. Geological Center of Tianjin Planning and Natural Resources Bureau,Tianjin 300042,China
Soil and crop samples were collected simultaneously from the main vegetable production areas of Tianjin. The concentration of available Cd, influence factors and key regulation factor were studied by correlation analysis and principal component analysis. The results show that the content of Cd in soil samples ranges from 0.21×10-6 to 1.03×10-6, with an average of 0.47×10-6, and the proportion exceeding the risk screening value (GB15618-2018) is 28%.The content of available Cd ranges from 0.05×10-6 to 0.48×10-6, with an average of 0.14×10-6. The Cd content in crop samples is lower than 0.05×10-6, which meet the food safety requirements (GB2762-2017). The content of Cd in crops is positively correlated with Cd and available Cd in soil (p<0.01). Available Cd content is negatively correlated with pH, CEC and clay content (p<0.01), positively correlated with available P content (p<0.01), but not with organic matter and Eh. Combined with principal component analysis and linear regression analysis, it can be inferred that Cd content is the dominant factor of available Cd in soil.
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