摘要:
在缺氧沉积物中,酸可挥发硫(AVS)是总硫含量中的一个活性最大的部分,它控制着还原状态沉积物内孔隙水的重金属浓度又通过与重金属形成硫化物,影响着沉积物中重金属的形态,现已证明,AVS与重金属反应是重要方面,AVS的变化来自人类活动(疏浚河道和港口)和自然现象(风暴的沉积物再悬浮的化学变化),本项研究通过对香港河流和海湾沉积物32d的连续充气实验,探索硫含量变化对Zn的影响,结果表明:沉积物充分氧化过程引起AVS的迅速减少,同时,Zn、Eh、DO、pH也发生了明显的变化趋势.
关键词:
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香港
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沉积物
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酸可挥发硫、锌
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充气
Abstract:
Acid-volatile sulfide (AVS)has been shown to be the part of activity the lagest of todal sulfide content in anoxic sediments. Acid-volatile sulfide (AVS)controls concentration of heavy metals in pore water of reduction phase sediments and it form sulfide with heavy metals again, and effects shape of heavy metals in sediments. Sutdy has been proven to be the dominant phase AVS reacting with heavy metals. Change of AVS can occur either through human activities, such as dredging waterways and harbors, or by natural phenoment, such as resuspenslon due to storms and changes in sediment chemistry. The study passed a series of laboratory aeration experiments for 32 days, effect of probe the change of sulfide content on zinc. The result shows: aeration of sediments results in rapid decrease of the AVS. At the same time, Zn, Eh, Do, pH happened clear change trend again.
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