ZHANGXiang-qiong,WANGYan-xin,LIUBo,et al.Hydrogen Peroxide Reduction and Potassium Dichromate Reverse Titration for Determination of Chlorate in Sodium Hypochlorite[J].China Water & Wastewater,2022,38(16):135-138.
H2O2还原-重铬酸钾返滴定法测定次氯酸钠中氯酸盐
- Title:
- Hydrogen Peroxide Reduction and Potassium Dichromate Reverse Titration for Determination of Chlorate in Sodium Hypochlorite
- 摘要:
- 水厂使用低浓度次氯酸钠消毒过程中，存在很大的氯酸盐含量超标风险，因此，次氯酸钠中的氯酸盐含量、氯酸盐与有效氯之比将成为自来水企业未来关注的重点。但是目前次氯酸钠中氯酸盐含量检测尚无国家标准和行业标准，为此研究建立了过氧化氢还原-重铬酸钾返滴定法测定次氯酸钠消毒剂中氯酸盐含量的分析方法。对样品前处理中的过氧化氢、饱和碳酸钠溶液的加入量以及加热时间等实验条件进行了优化，并对实际样品和标准样品进行了测定，测定结果的相对标准偏差为1.0%~2.7%，标准样品测定结果的相对偏差为-1.0%~3.7%，实际样品加标回收率为95.5%~103.6%，与离子色谱法测定结果无显著差异。该方法操作简便、经济、适用性强、准确度高，可用于次氯酸钠消毒剂中氯酸盐含量的测定。
- Abstract:
- There is a great risk of chlorate content exceeding the standard in the disinfection process of low concentration sodium hypochlorite in water plants. Therefore, content of chlorate in sodium hypochlorite and the ratio of chlorate to effective chlorine will become the focus of water enterprises in the future. However, there is no national standard or industrial standard for the determination of chlorate content in sodium hypochlorite at present, so the method of hydrogen peroxide reduction and potassium dichromate reverse titration for the determination of chlorate content in sodium hypochlorite disinfectant was established. The experimental conditions, such as the amount of hydrogen peroxide, saturated sodium carbonate solution and heating time, were optimized, and the chlorate contents in actual water samples and reference samples were determined. The relative standard deviation of the determination results was 1.0%-2.7%, the relative deviation of the reference samples was -1.0%-3.7%, and the recoveries of actual water samples were 95.5%-103.6%, which had no significant difference with the results determined by ion chromatography. The method is simple, economical, applicable and accurate, and can be applied for the determination of chlorate content in sodium hypochlorite disinfectant.
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