摘要
研究了Ｃｅ（ＳＯ４）２Ｈ２ＳＯ４体系反向流动注射分析法测定环境水中化学需氧量（ＣＯＤ）的试验条件。在２．５～１６０．０ｍｇ／Ｌ线性范围内，采样频率达到２５／ｈ，Ｃｌ－的质量浓度至２５００ｍｇ／Ｌ无干扰。对６０ｍｇ／Ｌ的标准试样重复测定１１次，相对标准偏差为０．７９％，检出下限为２．５ｍｇ／Ｌ。该法便于实际工作中ＣＯＤ的连续监测，用于河水、池塘水分析，获得结果与经典的重铬酸钾法相对照。
A system of Ce(SO4)2H2SO4 for determination of COD in natural water samples by reversed flow injection analysis is discussed. In the linear range of 2.5160.0 mg/L for COD concentration, the sampling frequency of 25/h is obtained. Up to 2500 mg/L of Cl- does not interfere with determination of COD. The detection limit of the method for COD is 2.5 mg/L. Precision of the determination for the sample with 60 mg/L of COD is 0.79% RSD (n=11). The method has been applied to the online determination of COD in river and pool water and the results are in agrecment with traditional method using potassium dichromate.\=\=
出处
《岩矿测试》
CAS
CSCD
北大核心
1999年第3期185-188,共4页
Rock and Mineral Analysis
基金
甘肃省自然科学基金
甘肃省环保局科学技术资助
关键词
化学需氧量
反向流动注射分析
环境水
chemical oxygen demand(COD)
reversed flow injection analysis
natural water
