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1·To remove main disturbing ion, chlorine ion in the COD potassium dichromate reflux method, silver sulfate replaces mercury sulfate as a screening agent.

对cod重铬酸钾回流法中的主要干扰离子，氯化物的消除，选择了用硫酸银代替硫酸汞做掩蔽剂。

2·Iron line replacement method is used to recovery metal silver from silver sulfate in COD waste liquid, and it is reused to analyze, so analysis cost and environment pollution are decreased.

对COD废液中的硫酸银，采用铁线置换法回收金属银，进行循环使用，降低了分析费用，减小了环境污染。

3·In this paper, the study on making cupric sulfate with high arsenic bearing copper concentrate and the recovery of gold and silver are introduced.

介绍了以高砷铜精矿为原料，进行制取硫酸铜并回收其中金银的研究。