| 杜作灵,王永鑫,张晓丽.流动注射法测定生活饮用水中挥发酚脱氯剂的研究[J].贵州地质,2025,42(3):409-413, 422 |
| 流动注射法测定生活饮用水中挥发酚脱氯剂的研究 |
| Research on the Determination of Volatile Phenol Dechlorinating Agents in Domestic Drinking Water by Flow Injection Method |
| 投稿时间：2025-04-22 |
| DOI： |
| 中文关键词: 流动注射 硫代硫酸钠 挥发酚测定 脱氯剂 |
| 英文关键词:Flow injection method Sodium thiosulfate Volatile phenol Dechlorinating agent〖WT〗 |
| 基金项目:贵州省地质矿产勘查开发局地质科研项目(编号:黔地矿科合〔2022〕19 号) |
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| 中文摘要: |
| :根据《生活饮用水卫生标准》(GB 5749-2022)，出厂水中游离氯需控制在03〖XC线.TIF,JZ〗2 mg/L之间。游离氯的存在使生活饮用水具有较强氧化性，测定生活饮用水中的挥发酚时，会使挥发酚的测定结果偏低。方法《生活饮用水标准检验方法》(GB/T 57504-2023)中以硫酸亚铁铵消除余氯的影响。但硫酸亚铁铵作脱氯剂会有少量沉淀产生，给挥发酚检测带来困难。为解决这一困难，本文以硫代硫酸钠作脱氯剂，既消除了余氯对挥发酚测定的影响也无其他影响测定的干扰产生。实验结果表明，以硫代硫酸钠作脱氯剂，测定挥发酚的加标回收率，经7次平行测定，挥发酚回收率在1026%〖XC线.TIF,JZ〗1081%之间，相对标准偏差(RSD， n = 7)＜ 5%。对硫代硫酸钠作脱氯剂的实用性作探究，以硫代硫酸钠为脱氯剂的溶液于(0〖XC线.TIF,JZ〗4)℃下保存48 h，测定挥发酚的回收率在975%〖XC线.TIF,JZ〗104%之间。由实验结果可知，硫代硫酸钠作脱氯剂，效果良好，在实际生产中，降低了时间成本和经济成本，提高生产效率。 |
| 英文摘要: |
| According to ‘Sanitary Standards for Drinking Water’ (GB 5749-2022), the free chlorine should be controlled beween 0.3 to 2 mg/L in the treated water. The exist of free chlorine will cause the drinking water has strong oxidability. When determining volatile phenols in domestic drinking water, residual chlorine can cause the determination results of volatile phenols to be lower. Method: Ammonium ferrous sulfate is used to eliminate the influence of residual chlorine in ‘Standard Test Methods for Drinking Water’ (GB/T 5750.4-2023). However, when ammonium ferrous sulfate is used as a dechlorinating agent, a little precipitation will be produced, which will brings difficulties to the detection of volatile phenols. In order to solve this dif-ficulty, sodium thiosulfate is used as the dechlorinating agent in this paper. That is, the influence of residual chlorine on the determination of volatile phenols was eliminated and no other interference was generated. The experimental results show that when sodium thiosulfate is used as the dechlorinating agent to determine the spiked recovery rate of volatile phenols, after 7 parallel determinations, the spiked recovery rate of volatile phenols is between 1026% and 1081%, and the relative standard deviation (RSD, n = 7) is ＜5%. The practicality of using sodium thiosulfate as a dechlorinating agent was explored. The solution with sodium thiosulfate as the dechlorinating agent was stored at 0℃〖XC线.TIF,JZ〗4℃ for 48 hours, and the recovery rate of volatile phenols was determined to be greater than 975%〖XC线.TIF,JZ〗104%. It can be known from the experimental results that sodium thiosulfate has a good effect as a dechlorinating agent. In the actual production, it can improve production efficiency, save time cost and economic cost. |
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