紫外可见分光光度法测定地表水和地下水的高锰酸盐指数

用分光光度法测定水中高锰酸盐指数。方法检出限为0.05mg/L。对实际水样进行连续5次测定,方法精密度为1.01%～1.20%,回收率为95.0%～100.5%。经国家标准容量法验证,结果与标准方法测定值相符。方法简便快速,灵敏度高,精密度好,试剂试样量少,成本低,适用于测定氯化物低于300mg/L、清洁或污染轻微的水样高锰酸盐指数的分析。

Ultraviolet-visible Spectrophotometric Determination of Permanganate Index of Surface Water and Groundwater

The permanganate index in surface water and groundwater was determined by ultraviolet-visible spectrophotometry. The detection limit of the method was 0.05 mg/L and the recoveries were 95.0%~100.5% with precision of 1.01%~1.20%RSD (n=5). The analytical results from this method are consistent with those determined by standard volumetric method. The method provides the advantages of high sensitivity and precision, high efficiency, less cost and is suitable for the determination of permanganate index in clean or slight polluted surface water and groundwater samples with chloride content of <300 mg/L.