东平湖不同粒径底泥沉积物中汞的形态分布

Morphology Distribution of Mercury in Sediments of Different Sizes in the Dong-ping Lake

对东平湖底泥沉积物中重金属汞的总量和形态及沉积物形貌进行了研究,从粒径分布与沿程分布分析了汞元素的形态分布特征。结果表明,东平湖底泥沉积物的主要粒径<63μm,且沉积物颗粒粒径越小,其表面的吸附物越多。不同粒级沉积物中汞的存在均以可氧化提取态形式为主,汞的形态分布与沉积物粒径的相关性可能受到原生矿物及因粒度效应产生吸附差异的综合影响。汞形态的沿程分布特征表明,湖南采样点受污染严重,潜在危害较大。

Total content and morphology of mercury in sediments in Dong-ping Lake were determined. The characteristic of morphologic distribution was discussed from two aspects-size distribution and distance distribution. The results showed that the smaller the size of surface sediments was, the more matters it adsorbed. The most particulate sizes of sediments in the Dong-ping Lake were less than 63um. Mercury existed in sediments with different sizes as oxidizable fraction primarily, and the relationship between morphology of mercury and particulate size of sediments was influenced by the mineral composition and the adsorption involved in granularity effect. The results of distance distribution of mercury indicated that south lake was heavy polluted and had potential harm to environment.