新乡市王村污灌区土壤中重金属污染及相关性分析

Investigation of the Pollution and Correlation of Heavy Metals in Sewage-irrigated Area in Wangcun,Xinxiang City

采用田间试验,研究了新乡市王村污灌区土壤中Cd,Ni,Zn,Cu的含量及相关性特征.结果表明,除部分Cu的含量能达到国家土壤环境质量二级标准之外,Cd,Ni和Zn的含量均超出标准限值,Cd的污染最严重;重金属化学形态的相关性分析表明,土壤中Cd全量与5种化学形态均显著相关;Ni的全量与碳酸盐结合态和有机结合态显著相关;Zn的全量只与有机结合态显著正相关;Cu的全量与可交换态,碳酸盐结合态,有机结合态及残渣态呈显著相关.

A primary study is performed to investigate the pollution and correlation of Cd,Ni,Zn,Cu in sewage-irrigated area in Wangcun,Xinxiang City.The results showe that the contents of Cd,Ni,Zn are about 90.08,21.14 and 3.82 times of the value for target element in the National Environmental Quality Standard for soils,respectively.But the concentration of Cu in soil is less than the limited value.The correlation between different factors of heavy metals in Wangcun sewage-irrigated soil area are also investigated.The results show that there are significant correlation of Cd between the total content and all fractions in soil.There is a significant correlation of Ni between the total content and organic fraction and carbonate-bound fraction.And thereis a significant correlation of Zn between the total content and organic fraction.There is also a significant correlation of Cu between the total content and exchangable fraction,carbonate-bound fraction and residual bound fraction.