氢氧化钠标准溶液浓度标定方法的比较研究
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摘要
采用了酸碱滴定法和电导滴定法两种方法,利用两种基准物质邻苯二甲酸氢钾和草酸对氢氧化钠标准溶液的浓度进行了标定.对比邻苯二甲酸氢钾和草酸两种基准物,在酸碱滴定法上,二者测定的氢氧化钠标准溶液的平均浓度比较接近,相对标准偏差差异不显著,均符合滴定分析的标定要求.在电导率滴定法上,两种基准物测得的相对标准偏差比酸碱滴定分析法的相对标准偏差均偏大.
In this paper, two methods of acid-base titration and conductometric titration were adopted to calibrate the concentration of sodium hydroxide standard solution by using two reference materials, potassium hydrogen phthalate and oxalic acid. Through the comparision for potassium hydrogen phthalate and oxalic acid, in the acid-base titration method, the average concentration of sodium hydroxide standard solution determined by the two methods was close, and the relative standard deviation was not significant, both met the requirements of the titration analysis. In the conductometric titration method, the relative standard deviations of the two reference materials were larger than those of the acid-base titration method.
In this paper, two methods of acid-base titration and conductometric titration were adopted to calibrate the concentration of sodium hydroxide standard solution by using two reference materials, potassium hydrogen phthalate and oxalic acid. Through the comparision for potassium hydrogen phthalate and oxalic acid, in the acid-base titration method, the average concentration of sodium hydroxide standard solution determined by the two methods was close, and the relative standard deviation was not significant, both met the requirements of the titration analysis. In the conductometric titration method, the relative standard deviations of the two reference materials were larger than those of the acid-base titration method.
引文
[1] 李红,于素青,周志琴.氢氧化钠标准溶液制备和标定影响因素探讨[J].全面腐蚀控制,2015,29(7):24-26.
[2] 张学东,丁秋玲.医用化学实验教程[M].武汉:华中科技大学出版社,2010.
[3] 张超.氢氧化钠标准溶液配制与标定的影响因素[J].计量测试与技术,2012(7):73.
[4] 刘卫超.两种方法标定氢氧化钠滴定溶液结果分析[J].河南预防医学杂志,2006,(17(4):201-202,
[5] 王志平.标准草酸溶液标定氢氧化钠溶液中指示剂的选择[J].集宁师专学报,2004,26(4):63-64.
[6] 张君.氢氧化钠标准溶液浓度的不确定度评定[J].农业科技与装备,2017,279(9):58-60.
[7] 杨玉.氢氧化钠标准溶液浓度不确定度的评定[J].广东化工,2007,34(6):117-120.
[8] 郑定钊.氢氧化钠标准滴定溶液的标定及其不确定度评定[J].福建分析测试,2006,15(3):57-62.
[2] 张学东,丁秋玲.医用化学实验教程[M].武汉:华中科技大学出版社,2010.
[3] 张超.氢氧化钠标准溶液配制与标定的影响因素[J].计量测试与技术,2012(7):73.
[4] 刘卫超.两种方法标定氢氧化钠滴定溶液结果分析[J].河南预防医学杂志,2006,(17(4):201-202,
[5] 王志平.标准草酸溶液标定氢氧化钠溶液中指示剂的选择[J].集宁师专学报,2004,26(4):63-64.
[6] 张君.氢氧化钠标准溶液浓度的不确定度评定[J].农业科技与装备,2017,279(9):58-60.
[7] 杨玉.氢氧化钠标准溶液浓度不确定度的评定[J].广东化工,2007,34(6):117-120.
[8] 郑定钊.氢氧化钠标准滴定溶液的标定及其不确定度评定[J].福建分析测试,2006,15(3):57-62.