土壤矿物对重金属离子Pb和As的吸附研究

Study on Adsorption of Heavy Metal Ions Pb and As by Soil Minerals

文章以土壤矿物为研究对象,通过吸附试验,探究土壤吸附Pb和As存在不同规律的微观机理。结果表明:pH值影响Pb和As在溶液中存在形态和土壤吸附能力,在低pH值时,Pb主要以正二价的形式存在,而As主要以中性的H_(3)AsO_(3)和带负电的H_(2)AsO_(3)^(-)形式存在,土壤对Pb的吸附能力随pH值升高而增强,而对As的吸附能力随pH值升高而减弱。

In this paper,soil minerals are taken as the research object,and the micro-mechanism of soil adsorption of Pb and As with different patterns is explored through adsorption experiments.The results show that pH value affects the existence morphology of Pb and As in solution and soil adsorption capacity,at low pH,Pb mainly exists in the form of positive divalent,while As mainly exists in the form of neutral H_(3)AsO_(3)and negatively charged H_(2)AsO_(3)^(-),and the adsorption capacity of soil for Pb increases with the increase of pH value,while the adsorption capacity of As decreased with increase of pH value.