在我国工业生产的清洗电镀行业中,用铬酐进行清洗钝化是相当普遍的。应用铬酐进行钝化,就产品质量来说确实具有不少优点。但随着工业的发展,它的用量越来越大,工业生产废水中 C_r~(6+)浓度越来越高,因此,它的毒性作用就越来越明显。根据大量的动物实验数据 In China's industrial production of cleaning plating industry, the use of chromic anhydride cleaning passivation is quite common. The use of chromic anhydride for passivation does have a number of advantages in terms of product quality. However, with the development of industry, its use is more and more large, and the concentration of C_r ~ (6+) in industrial production wastewater is getting higher and higher. Therefore, its toxic effect becomes more and more obvious. Based on a large number of animal experiments data