摘要
提出了一种以重铬酸钾为氧化剂,以6%硫酸银代替硫酸汞作为掩蔽-催化剂消除高氯离子干扰,测定化学需氧量(COD)的无汞密封新方法。研究了反应温度、反应时间和硫酸银浓度等测定条件。该法可以避免汞盐对环境的污染,适合测定多种类型的水样。该法测定结果的相对标准偏差为1.4%(n=8),平均加标回收率为98.5%.
A new method for the determination of COD was eatablished. In this method potassium dichromate was used as ox- idant and silver sulfate inhibitor to elimination of chloride ion interference instead of mercury sulfate. The reaction conditions such as reaction time, reaction temperature and silver sulfate concentration were investigated. The new method can avoid pollution to environ- ment. The method can be used to determine various water samples. The RSD was 1.4% （ n = 8） , and the average recovery was 98.5%,
出处
《化学分析计量》
CAS
2007年第4期29-31,共3页
Chemical Analysis And Meterage
关键词
化学需氧量
高氯离子
干扰
无汞密封法
COD, high-chloride ion, interference, mercury-free close-tube method
