攀西某芒果产区土壤重金属污染源解析

为了探究攀西地区芒果产区土壤重金属的污染来源,通过基于地理信息系统(geographic information system,GIS),结合数理统计、相关性分析以及正定矩阵因子分析等方法,以攀枝花米易县某芒果产区为研究区分析土壤重金属的污染现状并识别重金属来源.结果表明:研究区土壤样品中Cd全超标,Cr、Cu、Ni超...

Source Apportionment of Soil Heavy Metal Pollution in a Mongo Producing Area in Panxi

To clear the source of soil heavy metal pollution in a mongo producing area in Panxi, this article is based on geographic information system (GIS), combined with the mathematical statistics, correlation analysis and Positive Matrix Factorization (PMF) analysis method for analysis of pollution situation and source identification of soil heavy metals in a mongo producing area located in Miyi county, Panzhihua, Sichuan province. The results showed that:(1) Compared with the risk screening values for soil contamination of agricultural (GB15618-2018), Cd in all soil samples exceeds the standard, and exceeding standard rate of Cr, Cu and Ni ranges from 29.63% to 37.04%, and only Pb and Zn satisfies the quality requirement of national soil environment. (2) Only the average Zn content in the six heavy metals did not exceed the background value of Sichuan Province, and the average other heavy metals exceeded the background value;(3) No excessive heavy metals were detected in mango pulp, and no sign of enrichment of heavy metals in mango was found;(4) Cd plays a controlling role in soil heavy metal pollution in the study area, mainly from soil parent material and agricultural production activities, and the total contribution rate of pollution sources related to human production activities to Cd is 2.3 times that of soil parent material sources;(5) Industrial and agricultural production activities are main sources of Cu in soil and their contribution rate is 97.19%. (6) Cr and Ni mainly come from agricultural production activities such as fertilization during mango planting.