有机物料对土壤外源铜络合作用及影响因素研究

Research on the Effects and Influence Factors of Organic Materials on Complexation of Exogenous-Cu in Yellow Soil

本文采用动态培养的方法,分析了添加四种有机物料后土壤有机结合态铜含量的动态变化,并探讨了有机物料种类、性质和土壤铁氧化物组分对络合作用的影响。结果表明:有机物料的加入促进了土壤紧有机结合态铜和松有机结合态铜的形成,同时也促进了土壤活性铁和络合态铁的形成,铁离子与铜离子间存在竞争络合现象。泥炭和风化煤处理对促进外源铜向紧有机结合态铜转化的影响趋势更强;猪粪和玉米秸秆对土壤铁形态影响更显著,二者对外源铜向无定形铁结合态转化的促进作用亦更大。

The dynamic changes of the contents of organic bound Cu were analyzed by applying dynamic incubation experiment. The effects of the types and characteristics of organic materials and the contents of iron oxide were discussed in Cu-polluted yellow soil. The results showed that four types of organic materials promoted forming stable organic bound Cu （SBO-Cu） and weak organic bound Cu （WBO-Cu）, also forming active iron and complexing iron. There was a phenomena of competitive complexation between iron and copper ions in all four trials. The effects of peat and weathering coal on forming SBO-Cu were more evident than pig manure and corn straw, but the effects of pig manure and corn straw on forming soil iron were more prominent, which promoted forming the amorphous iron.