苏州河底泥中汞的形态分布和释放能力的关系

The Relationship Between Species Distribution and Release Ability of Mercury in Sediment of Shanghai Suzhou River

本文以上海苏州河河水-底泥静态体系为对象,研究了在不同温度、pH值和模拟船舶航行与疏浚引起扰动等天然环境条件下,底泥中汞的形态分布和总汞释放之间的关系。研究表明,在静水体系中构成底泥汞释放的主要形态是水溶态汞、酸溶态无机汞和碱溶态汞,而在扰动体系中,几乎所有形态汞都对释放作了贡献。底泥中汞形态分布的变化是各形态汞具有不同的释放能力和它们之间相互转化的综合结果,同时,汞的形态分布和释放能力之间的关系在不同的环境条件下呈现不同的特征。

Using a static system of Shanghai Suzhou River water and its sediment, the relationship between mercury species distribution in sediment and the release of total mercury was studied under various conditions of the natural environment such as temperature and pH of water and the disturbance caused by shipping and dredging. It was shown that the predominant species released from the sediment in a quiet water system were water soluble mercury, hydrochloric acid, soluble inorganic mercury and alkali soluble mercury, and almost all the mercury species contributed for the release in disturbed system.The changes of mercury species distribution in sediment could be attributed to the combination of various release ability of different mercury species and their transformation from each other; and furthermore, the relationship mentioned would present different features under different conditions.