【摘要】 <正>自从轰动世界的日本“骨痛病”公害发生后,镉的环境污染问题日益为世界各国所重视。由于镉金属具有许多优良的特性而被广泛应用,但它对人类健康的危害也很大。在使用和生产过程中镉会严重污染环境,尤其对江河、海洋的污染直接危害水生生物,进而危害人类健康。镉是一种重要的环境污染物。更多还原

【Abstract】 A Preliminary investigation on chemical forms of cadmium, a serious environmental pollutant in the water body of Zhujiang estuarine area was carried out, and the rule of their distribution has been studied. The analytical method in which a Model AD-1 polarograph is used to determine five chemical forms of cadmium-inorganic strongly bound (Cdrsb), inorganic weakly bound(Cdrwb), organic bound(CdoB), labile(CdL)and particulate(Cdp), is briefly described. Results show that in the water body soluble cadmium species, including CdrSB, Cdrwb, CdOB and CdL, account for about 75% of the total, while CdP only about 25%, of which CdrSB is 41%, CdL 19%, CdOB 9 % and CdrwB 6 %. However, this is an average calculation of distribution. Each form distributes differently in the different area, i.e. fresh water area, brackish water area and sea water area. For instance, from fresh water area to sea water area, content of Cdp gradually decreases; CdrSB content almost remains the same, whereas CdL gradually increases.In this paper, we attempt to study, theoretically and practically, the possible causes which bring about the changes when the cadmium species are being transported. In addition, the general survey of cadmium pollution in this estuarine area has also been discussed.更多还原