银盐沉淀法测定化工废水中的COD  

Analytical Techniques of Determining COD in Chemical Wastewater with Silver Precipitation Method

作　　者：姜玉梅[1] 

机构地区：[1]湖南化工职业技术学院,湖南株洲412004

出　　处：《当代化工》2009年第2期198-200,共3页Contemporary Chemical Industry

摘　　要：研究了用硝酸银代替硫酸汞掩蔽氯离子测定化工废水中COD的分析方法;试验了从COD测定废液中提取氯化银沉淀,直接用氯化银与浓硫酸反应制备硫酸银催化剂的可行性。实验结果表明,该法具有较好的准确性和重复性,从根本上避免了汞对环境的污染及银的浪费,有着较好的社会效益和经济效益。The analytical methods to determine COD in chemical wastewater by using silver nitrate in place of mercury sulfate to mask chloride ion were studied;Extracting silver chloride precipitation from the determined COD waste liquid, the feasibility of preparing silver sulfate catalyst by the direct reaction of silver chloride and concen- trated sulfuric acid was analyzed. Experimental results showed that the method has good accuracy and repeatabili- ty, fundamentally avoiding the environmental pollution caused by mercury and silver waste. Thus it has a better social and economic benefits.

关 键 词：COD 化工废水 银盐沉淀法 

分 类 号：O655[理学—分析化学]