纳米级二氧化锰对土壤中砷形态影响的研究

Effect of Nano-Manganese Oxides on As Fractions in Soil

本文通过土壤原位钝化与土壤砷分级实验,研究了添加浓度为土壤质量0.2%、0.5%、1.0%、2.0%的纳米级二氧化锰对土壤中砷形态的影响。结果表明:添加了纳米级二氧化锰的土壤中,其土壤中As的形态以残渣态为主,占50%左右,其次是Fe-As、Ca-As,Ca-As含量随着纳米级二氧化锰含量增加变化趋势是先增加后降低,且浓度为2.0%的纳米级二氧化锰添加量土壤中Ca-结合态As最少,为12.25%;纳米级二氧化锰对土壤中松散结合态As有一定影响,但影响效应不显著;同时发现,对于土壤中的残渣态As,添加纳米级二氧化锰对其有增加作用。

The As species in paddy soil before and after adding 0.2%, 0.5%, 1.0%, 2.0% nano-manganese oxides were analyzed within site immobilization and As species classification. The results showed that As was mainly in the residual form, which accounts for 50%, when adding the nano-manga- nese oxides, and followed Fe-As and Ca-As. The nano-manganese oxides could decrease the contents of Ca-As in soil, and when the 2.0% of the nano-manganese oxide was added to soil, the percentages of Ca-bound was the lowest with 12.25%. While, there were non-significant effects on the loosely bounded As with nano-manganese oxides. Moreover, the percentage of residual As in the soil increased with nano-manganese oxide increasing.