Effect of aeration of sediment on cadmium binding
Effect of aeration of sediment on cadmium binding
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DOI：
10.1002/etc.5620130505
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发表时间：
1994-05
影响因子：
4.1
通讯作者：
Y. Zhuang;H. Allen;G. Fu
中科院分区：
文献类型：
--
作者：
Y. Zhuang;H. Allen;G. Fu
酸挥发性硫化物（AVS）是缺氧沉积物中与金属反应的主要相态。沉积物中的AVS减少再悬浮由于风暴和疏浚，并在冬季时，通气过程的速率超过硫化物的形成。作者在间歇式反应器中进行了一系列实验室曝气实验，以研究曝气对沉积物中硫化物含量和镉（一种模式有毒金属）在沉积物中的分配的影响。沉积物的曝气导致AVS的快速下降。作者研究了曝气期约一个月的沉积物特性。在此期间，溶解金属的浓度相对于测试开始时存在的浓度增加了200至400%或更多。与AVS和黄铁矿相关的金属浓度降低。在曝气过程中，含水铁和锰氧化物的浓度增加，这些材料在镉的结合中变得越来越重要。曝气后，> 50%的镉与沉积物中可提取的铁和锰成分有关。总的来说，曝气后沉积物对镉的结合能力降低。«少
Acid-volatile sulfide (AVS) has been shown to be the dominant phase reacting with metals in anoxic sediments. The AVS in sediment decreases upon resuspension due to storm and dredging, and in winter when the rate of aeration processes exceeds that of the formation of sulfide. The authors conducted a series of lab aeration experiments in batch reactors to investigate the effects of aeration of sediment on the sulfide content of sediment and on the partitioning of cadmium, a model toxic metal, to the sediment. Aeration of sediment results in rapid decrease of the AVS. The authors studied the sediment characteristics for aeration periods of approximately a month. During this time, the concentrations of dissolved metals increased by 200 to 400% or more, relative to the concentrations present at the beginning of the test. The concentration of metal associated with AVS and with pyrite decreased. During the aeration, there are increases in the concentrations of hydrous iron and manganese oxides, and these materials become increasingly more important in the binding of cadmium. Following the aeration, > 50% of the cadmium was associated with the extractable iron and manganese components of the sediment. Overall, the binding capacity of the sediments for cadmiummore » decreased after aeration.« less