|
| Safe threshold value of lead in cultivated land soil in eastern Yunnan， China |
| Received:January 30, 2022 Revised:June 13, 2022 |
| View Full Text View/Add Comment Download reader |
| KeyWord:cultivated soil;lead;species sensitivity distribution method;threshold value;available state content |
| Author Name | Affiliation | E-mail | | HAN Dongjin | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Yunnan Soil Fertilizer and Pollution Remediation Engineering Laboratory, Kunming 650201, China | | | ZHANG Naiming | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
Yunnan Soil Fertilizer and Pollution Remediation Engineering Laboratory, Kunming 650201, China | zhangnaiming@sina.com | | ZHAO Long | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | zhaolong1227@126.com | | HOU Hong | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | |
|
| Hits: 842 |
| Download times: 722 |
| Abstract: |
| There is an urgent need to carry out research on the safety threshold of heavy metals in contaminated soil based on the results of soil–crop field co-sampling. In this study, eastern Yunnan, which is affected by the superposition of high geological background and human activities, was selected as the research area. Based on co-sampling data of the cereal agricultural products and soil, and considering the physical and chemical properties of the latter, the analysis of lead（Pb）in the samples was carried out. The bioconcentration factors of cultivated lands at different pH ranges were deduced using the species sensitivity distribution（SSD） method and by establishing a regression model of safety threshold values. According to the SSD results（pH≤6.5, 6.57.5） , the full-dose safety thresholds were 84.4, 126.3 mg·kg-1, and 187.4 mg·kg-1, respectively, and the effective thresholds were 20.7, 52.1 mg·kg-1, and 104.5 mg·kg-1, respectively. A regression model was established to deduce the thresholds of available Pb content in soils at pH≤5.5, 5.57.5, whereupon the values were revealed to be 20.2, 42.5, 56.3 mg·kg-1, and 94.1 mg·kg-1, respectively. Through verification and comparison of the co-sampling data in the study area, it was found that the regression model had the highest accuracy（88.1%）in predicting the threshold of available soil Pb content. It is suggested that the predicted value can be used as the basis for a more scientific dynamic adjustment of the categories of soil environmental quality of agricultural land in eastern Yunnan. |
|
|
|
