鸭绿江口再悬浮沉积物中汞的释放

MOBILIZATION OF MERCURY FROM THE RESUSPENDED SEDIMENTS FROM YALUJIANG ESTUARY, NORTHEAST CHINA

报道了鸭绿江河口区悬浮物中汞含量随潮态的变化,并通过实验模拟研究了鸭绿江下游污染沉积物中汞在海水作用下的释放机理.结果表明,在河口区,高潮时悬浮物中汞含量低于低潮时的含量.其原因除了海水中氯离子对悬浮物中汞的络合作用以及碱金属和碱土金属离子的交换作用外,还由于悬浮沉积物中汞主要以有机物、腐殖酸结合态存在,碱性海水能溶解腐殖酸,从而导致与腐殖酸结合态汞的释放.

The variations in mercury contents in suspended particulate matter from Yalujiang estuary during mixing process of river and seawater were studied. The mobilizations of mercury in the sediments from the estuary were also investigated. It was found that the mercury content in the suspended solids is higher during hightide period than that during lowtide, due mainly to the complexation of Cl-and exchange of alkali and alkaline earth cations, as well as the release of organic material bound mercury from the suspended solids by seawater.