硫酸亚铁铵分光光度法测定水源水及生活饮用水中高锰酸盐指数

唐琳; 孔芳; 曾晖; 闻胜; 王艳

doi:10.13421/j.cnki.hjwsxzz.2021.06.011

硫酸亚铁铵分光光度法测定水源水及生活饮用水中高锰酸盐指数

Determination of Permanganate Index in Source Water and Drinking Water by Ammonium Ferrous Sulfate Spectrophotometry

摘要

摘要:
目的建立硫酸亚铁铵分光光度法测定水源水及生活饮用水中高锰酸盐指数的方法。
方法将加有2 mL水样和0.2 mL高锰酸钾溶液的玻璃消解管在恒温消解器中100 ℃下消解30 min。快速冷却后向样品消解管中加入0.2 mL硫酸亚铁铵溶液, 混匀, 再加入5.0 mL邻菲罗啉溶液显色, 使用分光光度计在510 nm波长下读取测试结果。
结果该方法测定生活饮用水中高锰酸盐指数的最低检测质量浓度为0.50 mg/L; 平均加标回收率为99.2%~107.2%;相对标准偏差为0.20%~0.66%;采用国家有证标准物质(GSB07-3162-2014)进行测定, 结果均在标称值范围内。
结论该方法具有精密度和准确度高, 操作简便等特点, 可以满足水源水及生活饮用水中高锰酸盐指数检测的需要。

Abstract:
Objective To develop a method to determine permanganate index in source water and drinking water by ammonium ferrous sulfate spectrophotometry.
Methods The 2 mL water sample and 0.2 mL KMnO₄ standard solution were added into a vial, which was heated at 100℃ for 30 min in a thermostatic digester. After cooling rapidly, 0.2 mL ammonium ferrous sulfate solution was added into the vial and mixed. Then the sample was colorized with 5 mL phenanthroline indicator solution. The permanganate index was measured by spectrophotometer at 510 nm.
Results The determined limits for permanganate index in drinking water was 0.50 mg/L. The average recoveries were from 99.2% to 107.2%, and the relative standard deviations ranged from 0.20% to 0.66%. The result of national certified standard substances (GSB07-3162-2014) by this method was within the range of quality control.
Conclusion The method established in this paper has the characteristics of good precision and accuracy, simple operation, time-saving and labor-saving, which was more suitable for the analysis permanganate index in source water and drinking water.

HTML全文

参考文献(14)

施引文献

资源附件(0)