铬参与人体糖和脂肪代谢,对人体的健康有着重要的生理功能,是人体的必需微量元素,铬最常见的氧化态是+2、+3和+6价,只有三价铬是人体必需的,但是过量摄入对人体也会造成危害。自然界中的铬以三价最稳定。生物体内三价铬也是最为稳定的存在形式,这是因为三价铬很容易和配位体生成一种比较稳定的络合物。
铬的毒性与存在的价态有关,二价铬毒性非常轻微;六价铬是一种强氧化剂,对人体有毒,并易被人体吸收且在体内蓄积,三价铬和六价铬可以相互转化,六价铬比三价铬毒性高100倍。
在临床上,六价铬及其化合物对于人体的伤害,通常表现在三个方面:一是损害皮肤,导致皮炎、咽炎等;二是损害呼吸道系统,引发肺炎、气管炎等;三是损害消化系统,误食甚至长期接触铬酸盐,极易造成胃炎、胃溃疡等。
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