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研究论文

摘要：黄浦江某支流上海市区河段底泥中汞形态分布的一个显著特征是水溶态汞和酸溶态有机汞之和占很大的比例(8—18％)。通过底泥在静止河水作用下的转化试验,发现底泥中水溶态汞、酸溶态无机汞以及碱溶态汞占总汞的百分含量分别呈一级反应和二级反应的动力学规律而衰减,其它各形态汞则随时间呈指数增加,转化速率几乎均随温度升高而增大,但水溶态汞向水相的释放量甚微,不会污染水体。通过各形态含量之间的相关,发现各种汞形态最终均转化为稳定的王水溶态汞。

Abstract：The speciation of mercury in sediment from a tributary of Huangpu River, Shanghai was investigated.It , was found that the fractions of water soluble and hydrochloric acid soluble organic mercury amounted to 8-18%, which were higher tham those found in other rivers.The transformation of mercury species in the sediment was studied and the results indicated that the reductions of the water soluble, the hydrochloric acid soluble inorganic and alkali soluble mercury obeyed either first-order or second-order kinetics, while other species increased with time exponentially.The rates of the transformation increased with the increase of temperature and the release of water soluble mercury to overlay water column was negligible.According to a correlation analysis, the aqua regia soluble mercury is the final sink for all mercury species in the sediment.