铬对海洋生物的影响

铬(Cr)是生物代谢活动中的一个基本营养元素,又是一个很毒的重金属元素。海水中溶解态铬主要以Cr(Ⅲ)、Cr(Ⅵ)和有机铬等形态存在;铬元素在海洋生物体内分布广泛,铬对单细胞藻类有一定的毒害作用,不同种类的单细胞藻类对铬元素有不同程度的富集作用,海洋细菌可将无机铬转化为有机铬;近年来,含铬的饲料已应用于水产养殖业,海洋环境污染研究中也将铬作为监测指标之一。

The effects of chromium on marine biology

Chromium is not only a nutritional element in metabolism, but also a very poisonous heavy metal element. In sea water, deliquescent chromium mainly exists in aqueous systems in trivalent (Cr 3 ), hexavalent (Cr 6 ) and organic forms. It has been found that chromium exists in many apparatus of marine biology. Although chromium is poisonous to single-cell algae, some kinds of algae have the ability to enrich chromium. Moreover, inorganic chromium can be changed into organic chromium by marine bacteria. Recently, chromous feed for aquatic product has been applied in aquaculture, and chromium is chosen as an index for environmental pollution.