作者：邹展, 赵许群, 史海

作者单位：中国科学院大连化学物理研究所, 辽宁 大连 116023

关键词：电位滴定;硝酸铵;氢氧化钠标准溶液

摘要：

研究以电位滴定法滴定水溶液中硝酸铵浓度，对该方法进行线性、精密度、准确度等试验，并将该方法与GB/T 659-2011《化学试剂 硝酸铵》中的检测方法进行对比。试验结果表明：电位滴定法可用于硝酸铵浓度的检测。在0.05~1.50 mol/L线性范围内r²为0.999 9，相对标准偏差为0.409%。消耗滴定液体积维持在4~13 mL之间时，试验相对误差小于1%。同时，与GB/T 659-2011中的化学滴定法的测定结果无显著差异。可见，使用电位滴定法测定硝酸铵线性、准确度、精密性均满足要求，且操作简便，有较好的可行性和实用性。

Determination of ammonium nitrate by automatic potentiometric titration
ZOU Zhan, ZHAO Xuqun, SHI Hai
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Abstract: The concentration of ammonium nitrate was studied by potentiometric titration. The method was tested by linearity, precision and accuracy, and the method was compared with the detection method in GB/T 659-2011. The results show that potentiometric titration method can be used to determine the concentration of ammonium nitrate. The linear relationship r² is 0.999 9 and RSD is 0.409%, when the concentration of ammonium nitrate is 0.05-1.50 mol/L. When the consumption of titration liquid is maintained between 4-13 mL, the relative error is less than 1%. And there are no significant difference in measurement values between potentiometric titration and the method in GB/T 659-2011. This study suggests that the potentiometric titration method has good linearity, precision and accuracy, which is easy to operate and can be feasible and practicable in determining NH₄NO₃.
Keywords: potentiometric titration;NH₄NO₃;sodium hydroxide standard solution
2019, 45(1):60-63  收稿日期: 2018-04-16;收到修改稿日期: 2018-06-23
基金项目:
作者简介: 邹展(1991-),女,辽宁大连市人,助理工程师,硕士,主要从事催化剂表征与分析
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