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高氯低COD值水样的无汞快速测定法
引用本文:李静,张园.高氯低COD值水样的无汞快速测定法[J].环境监测管理与技术,2014,26(6):42-45.
作者姓名:李静  张园
作者单位:天津市环境监测中心,天津,300191
摘    要:以硝酸银和硫酸铬钾代替硫酸汞来消除 COD 测定中的氯离子干扰,同时将重铬酸钾溶液的浓度降低为0.100 mol/L,并用硫磷混酸代替硫酸,该方法经过对标准样品和实际样品的测定,表现出对于测定氯离子含量低于25000 mg/L的高氯低 COD 值水样具有较好的准确度和精密度,同时可以实现银盐的回收再利用。

关 键 词:高氯水样  滴定法  快速测定

Study on Rapid Mercury free Determination of High chlorine Low COD Water Samples
LI Jing , ZHANG Yuan.Study on Rapid Mercury free Determination of High chlorine Low COD Water Samples[J].The Administration and Technique of Environmental Monitoring,2014,26(6):42-45.
Authors:LI Jing  ZHANG Yuan
Institution:( Tianjin Environment Monitoring Center, Tianjin 300191 , China)
Abstract:AgNO3 and CrK(SO4)2·12H2O was used instead of HgSO4 for elimination of chloride ion inter-ference in the determination of COD.Meanwhile,the concentration of potassium dichromate was reduced to 0.100 mol/L.A mixture of sulphuric acid and phosphor acid was used instead of sulfuric acid.The determina-tion of standard samples and examination of actual samples showed that this method had a good accuracy and pre-cision for determination of low-COD water samples containing chloride ion below 25 000 mg/L,and the silver re-cycling could also be achieved.
Keywords:COD  High chlorine water samples  Titration method  Rapid determination
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