不同分级标准对高背景值农田土壤重金属质量评价的差异性分析——以尤溪县为例不同分级标准对高背景值农田土壤重金属质量评价的差异性分析——以尤溪县为例.pdf

Advances in Geosciences 地球科学前沿, 2014, 4, 224-230 Published Online August 2014 in Hans. /journal/ag /10.12677/ag.2014.44027 Different Classification Standards of High Background Values of Farmland Soil Quality Evaluation of Heavy Metals Analysis of the Differences—In Youxi County Li He Fujian Monitoring Center of Geological Environment, Fuzhou Email: 316411457@ th st th Received: Jun. 4 , 2014; revised: Jul. 1 , 2014; accepted: Jul. 8 , 2014 Copyright © 2014 by author and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract This paper selected the existing soil environmental quality standard GB, soil nutrient classifica- tion standard, environmental background value and limit of four human health risk assessment standards of our country to evaluate farmland soil quality, and comparatively evaluated the heavy metal pollution’s situation of farmland soil by synthesizing index evaluation method. The results showed that due to soil environmental quality standards of the state, soil nutrient grading stan- dard is low, leading to bad evaluation results of regional overall assessment, and the right evalua- tion of ecological quality of the local farmland soil cannot be given. Evaluating with the standard of the provincial level upper limit of regional environmental background values, there were still 7 kinds of heavy metal exceeding; the variable coefficient of copper, zinc, cadmium, lead, mercury was 131%, 137%, 111%, 237% and 103% respectively, which was large among others. Based on the research results, adopting the human health risk assessment method, i