【摘要】 <正>为探明汞、镉在珠江口海域的迁移转化、最后归宿及评价海区对汞、镉的自净能力,从1980年1月—1984年10月,我们对汞、镉在本海域(113°31′—114°30′E,21°30′—23°02′N的范围)的含量分布、迁移的主要形式、吸附交换情况以及它们在沉积物中的化学形态等,进行了较为系统的研究。更多还原

【Abstract】 <Author>A series of studies on the content distributions, main migration forms in the water body, effects of environmental factors on migration and chemical forms in the sediments for Hg and Cd in the Zhujiang estuarine area has been made for over four years. The results are as follows: (1) The main migration forms of Hg and Cd in the water body are suspended Hg and inorganic strongly bound Cd, respectively; (2) of the factors effecting Hg and Cd migration from water to sediments, pH and salinity are more impor-tant ones; (3) The distribution of Hg and Cd contents in the surface sedi-ments decreases gradually in a seaward direction; (4) As chemical forms of Hg and Cd in the sediments differ from each other, their absorption to and desorption from the sediments are different, e.g., effects of pH on Hg de-sorption and of salinity on Cd desorption are obvious. The entry of high salinity may cause the exchangeable Cd in Lingding Yang sediments to dis-solve into the water body; (5) Purification effect of the sediments in the area on Hg and Cd in the waters is mainly chemical absorption; (6) There is a stronger self-purification capacity in the waters and a large tolerable level of Hg and Cd at the sediments.更多还原