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摘要
In order to further explore the background value of heavy metals in soil in Guangxi Xijiang River Basin. A sample of 2864 soil samples was screened for clean soil samples by large-scale systematic sampling. By calculating different means and analyzing and comparing, we re-proposed the background value of heavy metal in soils of Xijiang River in Guangxi. The results show that the background value of the Xijiang River Basin is(mg?kg -1 ): As 17.04,Sb 5.08,Cd 0.56,Pb 50.72,Cu 20.79,Ni 26.47,Zn 67.34,Cr 82.66. Compared with the previous research results, the background values of As, Cu, Ni, Zn and Cr newly proposed in this study are slightly different, the difference is within 5%.The background values of Cd and Pb are 4.2 times and 2.5 times that of previous studies and Sb is 4.8 times that of the national soil background. The main reason for the high elevation is that Nandan County, Jincheng River, Huanjiang County, Du'an County, Dahua County and Yizhou City in the upper reaches of the Xijiang River Basin are in the area of geochemical anomaly, The content of Cd, Pb and Sb in this area is very abnormal, making the whole heavy metal in the soil as a whole. It provides reference value for the re-proposed background value for the study of soil environment in the basin, and also provides an important basis for the development of soil environmental quality standards. ? 2018, Science Press. All right reserved.
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