3种测定皂类产品中氯含量方法的比较研究
目的 采用反滴定法、电位滴定法以及离子色谱法分别对皂类产品中的氯含量进行分析和比较。方法 反滴定法采用硫氰酸铵和硝酸银标准溶液进行滴定。电位滴定法采用银电极作为指示电极, 硝酸银作为标准溶液滴定。离子色谱法采用IonPac AS19阴离子交换色谱柱分离, 淋洗液为20 mmol/L KOH溶液, 以电导检测器检测。通过对市售6个香皂样品的检测结果分析, 进行3种方法的比较。结果 反滴定法、电位滴定法、离子色谱法的相对误差为1.2%~2.0%、1.5%~2.2%和0.9%~1.7%; 相对标准偏差分别为0.009%~0.014%、0.013%~0.016%和0.008%~0.012%; 加标回收率分别为101.9%±4.6%、99.8%±8.3%和101.9%±3.0%。结论 从精密度、准确度和加标回收率来看, 离子色谱法检测效果最好, 值得推广应用。
Objective To compare 3 kinds of methods for determination of chloride content in soap products, including back titration, potentiometric titration and ion chromatography. Method The back titration method used ammonium thiocyanate and silver nitrate standard solution for titration. In potentiometric titration method, the silver electrode was used as indicator electrode, and silver nitrate was used as standard solution for titration. In ion chromatography method, IonPac AS19 anion exchange column was used for separation with leacheate of 20 mmol/L KOH and detector of conductivity. Six soap samples were detected to compare the 3 different kinds of methods. Results The relative errors of back titration, potentiometric titration, ion chromatography were 1.2%~2.0%, 1.5%~2.2% and 0.9%~1.7%, respectively; the relative standard deviations of 3 test methods were 0.009%~0.014%, 0.013%~0.016% and 0.008%~0.012%, respectively; and the recoveries were 101.9%±4.6%, 99.8%±8.3% and 101.9%±3.0%, respectively. Conclusions Based on the precision, accuracy and recovery, the ion chromatography method is the best, which deserves to be popularized and applied.
标题：3种测定皂类产品中氯含量方法的比较研究
英文标题：Comparison of 3 kinds of test methods for determination of chloride content in soap products
作者：
杨园园 上海市质量监督检验技术研究院
程白羽 上海市质量监督检验技术研究院
吴秀萍 上海市质量监督检验技术研究院
中文关键词:香皂,氯含量,反滴定法,电位滴定法,离子色谱法,
英文关键词:soap,chloride content,back titration,potentiometric titration,ion chromatography,
发表日期：2016-05-21
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