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| Derivation of risk screening and intervention values for cadmium-contaminated agricultural land based on Chinese cabbage in the Guizhou Province |
| Received:December 25, 2018 |
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| KeyWord:risk screening values;risk intervention values;soil-crop transfer model;cadmium |
| Author Name | Affiliation | E-mail | | XU Gen-yan | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | SONG Jing | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | jingsong@issas.ac.cn | | GAO Hui | Wageningen University of the Netherlands, 6700 AA, Netherlands | | | ZHANG Sha | University of Delaware of the United States, DE 19716, USA | |
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| Abstract: |
| The objective of this study was to derive regional soil Cd criteria for cultivated land. Six representative soils were collected from Guizhou plateau and were spiked with Cd(NO3)2 in a pot experiment using Chinese cabbage. Two widely utilized extractants, 0.43 mol·L-1 HNO3 and 0.01 mol·L-1 CaCl2, were also included to evaluate the phytoavailability of Cd and were correlated to Cd concentrations in cabbage by either linear regression or multi-linear regression(log transformed). Soil Cd risk screening values(RSVs)and risk intervention values(RIVs)were back calculated based on food quality standards. The results indicated that total Cd and available Cd could be used to establish a highly significant regression model or multiple regression model for the Cd content in the edible parts of Chinese cabbage. Within the pH range(5.5 ≤ pH ≤ 8.0), the calculated soil Cd RSVs50(0.8~1.7 mg·kg-1)and RIVs95(2.8~8.4 mg·kg-1)were higher than the existing national standard(GB 15618-2018). The 0.43 mol·L-1 HNO3-Cd based soil Cd criteria increased with increasing soil pH. The 0.01 mol·L-1 CaCl2-Cd based soil Cd criteria was independent of soil pH. RSVs95, RSVs50, and RIVs95 were 0.02, 0.078 mg·kg-1, and 0.09 mg·kg-1, respectively. Standard suitability assessment using field and literature data showed that the existing national soil Cd standard was rather conservative. The RSVs50 based on total Cd and two available Cd proposed in this study showed a high rate of correctness(>80%). The present study confirmed that for better risk management of agricultural land, the establishment of regional soil environmental standards based on available concentration and specific crops is required. |
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