自动电位滴定法测定混合碱及不确定度的评定  

Determination of Mixed Alkali by Automatic Potentiometric Titration and Evaluation of Uncertainty

作　　者：吴继强 柳樱华 廖国超 袁冰清 王艳霞 成伟杰 WU Ji-qiang;LIU Ying-hua;LIAO Guo-chao;YUAN Bing-qing;WANG Yan-xia;CHENG Wei-jie(Lanzhou Petrochemical University of vocation technology,Lanzhou Gansu 730000,China)

机构地区：[1]兰州石化职业技术大学,甘肃兰州730060

出　　处：《辽宁化工》2022年第6期870-873,共4页Liaoning Chemical Industry

摘　　要：目的建立自动电位滴定法测定混合碱成分含量,并评定产生的不确定度。方法称取一定质量的试样,溶解完全后,用0.1 mol·L^(-1) HCl进行自动电位滴定;建立数学模型对测定时产生的不确定度进行评定。结果所选混合碱试样中w(Na_(2)CO_(3))为(65.00±0.7308)%,w(NaOH)为(34.98±0.3946)%。结论该方法操作简便,滴定终点易确定,准确性高;标准溶液标定、使用玻璃量器及滴定仪器是影响测定准确的显著因素,可以考虑尽可能地使用准确级别较高的仪器,或者对仪器进行校正,以此减小其对测定结果造成的影响。An automatic potentiometric titration method was established for the determination of mixed alkali,and the uncertainty was evaluated.After a certain mass of samples were weighed and dissolved completely,0.1 mol·L^(-1) HCl was used for automatic potentiometric titration.A mathematical model was established to evaluate the uncertainty.The results showed thatω(Na_(2)CO_(3))andω(NaOH)were(65.00±0.7308)%and(34.98±0.3946)%respectively.The method was easy to operate,the end point of titration was easy to determine and the accuracy was also high.The calibration of standard solution,the use of glass gauge and titration instrument were the noteworthy factors affecting the accuracy of the measurement.It could be considered to use the instrument with higher accuracy level as far as possible,or to calibrate the instrument,so as to reduce the influence of the instrument on the measurement results.

关 键 词：自动电位滴定法 混合碱 不确定度 

分 类 号：TQ014[化学工程]