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The organic contamination level based on the total soil mass is not a proper index of the soil contamination intensity |
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| Authors: | Hsu-Wen Hung G Daniel Sheng Tsair-Fuh Lin Yuhong Su Cary T Chiou |
| Institution: | aSustainable Environment Research Center, National Cheng Kung University, Tainan 70101, Taiwan;bCollege of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China;cDepartment of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan;dDepartment of Chemistry, Xinjiang University, Urumqi, Xinjiang 830046, China;eU.S. Geological Survey, Federal Center, Denver, CO 80225, USA |
| Abstract: | Concentrations of organic contaminants in common productive soils based on the total soil mass give a misleading account of actual contamination effects. This is attributed to the fact that productive soils are essentially water-saturated, with the result that the soil uptake of organic compounds occurs principally by partition into the soil organic matter (SOM). This report illustrates that the soil contamination intensity of a compound is governed by the concentration in the SOM (Com) rather than by the concentration in whole soil (Cs). Supporting data consist of the measured levels and toxicities of many pesticides in soils of widely differing SOM contents and the related levels in in-situ crops that defy explanation by the Cs values. This SOM-based index is timely needed for evaluating the contamination effects of food crops grown in different soils and for establishing a dependable priority ranking for intended remediation of numerous contamination sites. |
| Keywords: | Organic contaminants Pesticides Productive soils Soil contamination intensity Soil organic matter Crop contamination |
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