煤矸石土壤砷污染相关性分析

在对内蒙古自治区某矿区周边土壤环境总砷含量、全磷、有机质、含水率等项目测定的基础上,分析了土壤总砷含量、有效砷含量与土壤理化性质指标的相关性。同时,通过模拟研究区降水特点和降水量,采用淋溶试验装置,对由煤矸石和自然表层土壤组成的两组混合样品在不同pH值条件下砷的析出规律进行了实验研究。结果表明,研究区土壤有效态砷与总砷含量存在显著正相关关系;总砷含量与pH值、全磷存在一定的正相关性,与有机质和水解性氮之间的相关性不显著;土壤有效态砷含量与有机质含量呈正相关关系,与pH值呈一定的负相关关系。混合土层中砷的淋出量随淋溶液pH值的增加呈降低趋势,pH值越低,砷淋出量越高。

Correlation Analysis for Arsenic Pollution in Coal-gangue Soil

The correlations of soil physicochemical parameters with the total content of arsenic(As) and the available content of arsenic were analyzed based on the measured contents of arsenic, total phosphorus, organic matter and soil moisture in soils around a mine in Inner Mongolia area. There were two mixed samples consisting of coal gangue and local natural topsoil. Arsenic was separated out from the mixed samples through leaching process at different pH values according to rainfall amount and characteristics. Results show that there was a significantly positive correlation between the available arsenic and the total arsenic content. Total arsenic content had a certain positive correlation with pH value and total phosphorus, but insignificant correlation with organic matter and hydrolysable nitrogen. The available As content had a positive correlation with organic matter, but a negative correlation with pH value. The arsenic leaching decreased with the increasing pH value of leaching solution. The lower pH value was, the higher arsenic leaching was.