Hexavalent chromium plating has weaknesses such as toxicity and environmental pollution.
2
六价铬电镀工艺存在严重的环境污染问题，利用三价铬镀铬取而代之已经迫在眉睫。
It's urgent to develop the technique of trivalent chromium plating because of the heavy pollution of hexavalent chromium plating.
3
采集疑似危险废物含铬碳渣的样品，检测其浸出液中的总铬和六价铬含量，确定其性质，分析其污染特征；
Gather the sample of suspected hazardous waste (the chromium dreg), measured chromium in the lixivium, confirmed its property, analyzed its characteristic of pollution.
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