离子选择电极法测定天然水中氯离子含量
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摘要
天然水中常量元素氯的含量与人类身体健康密切相关,快速、准确地测定水中氯含量具有重要意义。目前,实验室测定天然水中氯离子的方法为国标法GB/T 11896—1989《水质氯化物的测定基本信息硝酸银滴定法》。该方法通过硝酸银滴定法测定水中氯离子。由于硝酸银滴定法依靠指示剂颜色的变化来判断滴定终点,容易造成较大检测误差。因此,为了快速、准确地测定天然水中氯离子含量,本文建立了离子选择电极法。该方法首先配制100 mg/L的氯化钠(NaCl)标准溶液,然后分别取0.5 m L、2.5 mL、5.0 m L标准溶液用以绘制标准曲线,实现天然水中氯离子的定量检测。该方法对天然水中氯离子的检测限为5.2 mg/L,测得氯离子标准溶液回收率为91.7%～101%,相对标准偏差范围为4.5%～6.4%。该方法可以准确测定天然水中的氯离子含量,且较国标法具有定量准确、操作简单、快速等优点,并且可以满足天然水中氯离子含量的测定。
The content of chlorine ion in natural water is closely related to human health, and it is a major element in natural water. Fast and accurate determination of chloride ion in natural water is of great importance. Current laboratory determination of chloride ion in natural water is Chinese National Standard Method GB/T 11896—1989 "Water Quality-Determination of Chloride-Silver Nitrate Titration Method". It is used for the determination of chloride in natural water nowadays, which based on the silver nitrate titration determination of chloride. However, the determination of titration end point relies on color indicator, which causes great detection error. Therefore, in order to detect the chloride content in natural water fastly and accurately, an ion selective electrode method was established. NaCl standard solution of 100 mg/L was prepared, and then 0.5 ml, 2.5 ml and 5 ml standard solutions were used to draw the standard curve and realize the quantitative detection of chlorine ions in natural water. The detection limit of chloride ions in natural water of this method is 5.2 mg/L, the recovery of chloride standard solution is between 91.7% and 101%. The standard deviation range is from 4.5% to 6.4%. This method can quantify chlorine in natural water accurately and simply, and can be widely applied for chlorine quantification in natural water. This method can satisfy the determination of chlorine ion content in natural water.
The content of chlorine ion in natural water is closely related to human health, and it is a major element in natural water. Fast and accurate determination of chloride ion in natural water is of great importance. Current laboratory determination of chloride ion in natural water is Chinese National Standard Method GB/T 11896—1989 "Water Quality-Determination of Chloride-Silver Nitrate Titration Method". It is used for the determination of chloride in natural water nowadays, which based on the silver nitrate titration determination of chloride. However, the determination of titration end point relies on color indicator, which causes great detection error. Therefore, in order to detect the chloride content in natural water fastly and accurately, an ion selective electrode method was established. NaCl standard solution of 100 mg/L was prepared, and then 0.5 ml, 2.5 ml and 5 ml standard solutions were used to draw the standard curve and realize the quantitative detection of chlorine ions in natural water. The detection limit of chloride ions in natural water of this method is 5.2 mg/L, the recovery of chloride standard solution is between 91.7% and 101%. The standard deviation range is from 4.5% to 6.4%. This method can quantify chlorine in natural water accurately and simply, and can be widely applied for chlorine quantification in natural water. This method can satisfy the determination of chlorine ion content in natural water.
引文
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[2]Chen W,He ZL,Yang XE,et al.Chlorine Nutrition of Higher Plants:Progress and Perspectives[J].Plant Nutr,2010(33):943-952.
[3]CB 5749-2006生活饮用水卫生标准[S].
[4]Franco-Navarro J D,Brumós J,Rosales M A,et al.Chloride Regulates Leaf Cell Size and Water Relations in Tobacco Plants[J].Journal of Experimental Botany,2015,67(3):873.
[5]N.M.Y unos,R.Bellomo,D.Story,et al.Bench-To-Bedside Review:Chloride in Critical Illness[J].Critical Care,2010,14(4):226.
[6]GB/T 11896-1989水质氯化物的测定硝酸银滴定法[S].
[7]张宁,郭德立.硝酸银滴定法测定水中氯离子含量的方法[J].山东交通科技,2016(6):93-94+98.
[8]程丁山,赵青秀,陈静娟,等.水中氯离子测定方法的应用与研究[J].青海石油,2014,32(1):129-130.
[9]艾合买提,李世迁,周培疆.硝酸银滴定法测量水中氯化物含量的不确定度评定[J].环境科学与技术,2011,34(7):161-166.
[10]叶菁.水中氯化物测定的分析方法[J].福建化工,2003(1):32-35.
[11]王志勇.硫氰酸汞分光光度法测定饮用水中氯化物[J].城镇供水,2013(5):49-51.
[12]盛丽娜,林华影,李一丹,等.容量法和离子色谱法测定水中氯化物的比较[J].职业与健康,2007(24):2269-2270.
[13]武汉大学.分析化学[M].北京:高等教育出版社,2011.
[14]付志军,罗桂娟,李雅妍,等.离子选择电极法测定水中氯化物[J].环境监测管理与技术,2014,26(1):49-52.
[15]徐金龙,刘中勇,华斌,等.分析化学中检出限问题探讨[J].检验检疫学刊,2012,22(6):74-76.