Probabilistic remediation criterions of contaminated soil for Pb derived from quality standards in wheat
CHAO Lei1,2, ZHOU Qi-xing1,3, CHEN Su1,2, CUI Shuang1,2
1. Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China; 3. College of Environmental Science and Engineering, NanKai University, Tianjin 300071, China
This paper contributes to the development of critical levels of heavy metal Pb in soil at which agriculture production of food is safe.In this study,a remediation criterion for Pb in soil is derived from the relationship from the Pb concentration and biomass of wheat between the total and available Pb in soil.Results showed that concentration of Pb in wheat increased with the increase of Pb application.With the biomass dropped by 10% set as the critical point for soil Pb pollution to be toxic to wheat in brown soil,the critical value is 292 mg·kg-1 for total Pb,7mg·kg-1 for available Pb.Given the food quality standard and a maximum acceptable probability of exceeding this standard,the Pb concentration in brown soil is 170 mg·kg-1 for total Pb,4 mg·kg-1 for available Pb.
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