摘要
利用东湖及长江两种不同类型的沉积物,研究了曝气对沉积物中重金属释放的影响,并对酸挥发性硫化物(AVS)的氧化及重金属的释放过程进行了非线性拟合.结果表明,在曝气条件下,AVS被氧化,沉积物pH值降低,与之相结合的重金属被释放出来.在两种沉积物中发生的AVS氧化反应属于同一类型反应;湖泊沉积物中重金属的溶出反应与AVS氧化密切相关,而河流沉积物中重金属的溶出反应则还与铁锰氧化物及有机质的变化有关.
Effect of aeration on heavy metals release from Changjiang River and Donghu Lake sediments was studied, and nonlinear regression was used to describe the acid-volatile sulfides (AVS) oxidation and the heavy metals release processess. The results show that acid-volatile sulfides are oxidized, pH value of the sediment decreases, and its combined heavy metals are released under aeration condition. The AVS oxidation reactions in these two sediments belong to the same type. In the lake sediment, the heavy metals release is related closely to AVS oxidation; while in the river sediments, this process is also related to the change of Fe and Mn oxides and organic matters in addition to AVS oxidation.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2002年第4期355-359,共5页
China Environmental Science
基金
中国科学院资源环境局重大资助项目(KZ951-A1-202)
关键词
曝气
沉积物
酸挥发性硫化物
重金属
aeration
sediments
acid-volatile sulfides
heavy metals