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| A new approach for evaluating soil heavy metal impact: A comprehensive index combined soil environmental quality and agricultural products quality |
| Received:June 24, 2016 |
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| KeyWord:heavy metals;soil environmental quality;agricultural products;evaluation approach;farmland |
| Author Name | Affiliation | E-mail | | WANG Yu-jun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LIU Cun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | CHEN Huai-man | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | hmchen@issas.ac.cn |
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| Abstract: |
| The current evaluation method of the effects of heavy metals in soil has not yet been closely linked to the element contents in soil and agricultural products, and its scientificity and reliability are often questioned. A new method was proposed in this paper incorporating simultaneously the contents of heavy metals in soil and agricultural products in the evaluation of the soil environmental quality standard, the soil element background values, the safety standard for maximum levels of contaminants in agricultural products, and the element valence effect. The method suitably applies to the influence evaluation of combined and/or separate soil heavy metal pollutions. The main steps of assessment procedures include the calculations of the relative impact equivalent, RIE; the deviation degree of the determined concentration from the background value, DDDB; the deviation degree of the soil environmental quality standard from the background value, DDSB; the quality index of agricultural products, QIAP; and then the influence index of comprehensive quality, ⅡCQ, was constructed on the basis of above values, which is the sum of ⅡCQS (the influence index of comprehensive quality of soil) and ⅡCQAp (the influence index of comprehensive quality of agricultural products). Furthermore, the principles and procedures of the evaluation method were established, and the soil environmental quality classifications based on the numerical index and description of soil environmental quality status were provided. The soil environmental quality for particular farmland uses was suggested to be divided into clean (ⅡCQ ≤ 1), slightly polluted (1<ⅡCQ ≤ 2), lightly polluted (2<ⅡCQ ≤ 3), moderately polluted (3<ⅡCQ ≤ 5), and heavily polluted (ⅡCQ>5), plus additional subgroups for pollution status with heavy metals exceeding standard only in soil or agricultural products. |
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