《Table 3 Standard Values for Environmental Quality of Soils(mg/kg)》

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《新型小城镇地质环境综合调查服务——以江苏丹阳2016年数据集为例》

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The single-element-based environmental quality grade of the soil in each assessment unit was determined by directly comparing the measured values of pH，Cd，Hg，Cu，As，Pb，Cr，Zn and Ni in the soil with their standard values specified in GB 15618-1995.Building on this，the soil categories determined by the indices mentioned above were summarized and the environmental quality grade of the soil in each unit was determined by the method that the highest value prevails（“one-vote veto”）.In this way，the soils of CategoryⅠ，Ⅱ，Ⅲand superⅢwere delineated.