该工艺具有成本低、生产周期短、无酸洗污染等优点。
Thetechnology possess the advantages of low cost, short producing and no picklingpollution.
本文介绍的铜制件光亮酸洗钝化工艺，既无有毒的含铬物质，又无氮氧化物污染。
The no pollution bright pickling passivation technique of copper parts introduced in this pa-per, has neither the toxic chromium containing materials nor nitrogen oxide pollution.
实验过程中采用铬酸洗液对实验器皿进行清洗，有效防止环境中邻苯二甲酸酯类物质对样品的污染。
All the vessels are cleaned by chromic acid lotion to avoid the dimethyl (o - ) phthalate in the environment to pollute the samples.
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