摘要
目的建立定量加酸-非线性拟合测定中性脱脂剂浓度的快速检测方法,解决滴定法和重量法在准确度和检测效率上不足的问题。方法采用脱脂剂原液配制成不同浓度的工作曲线溶液,在其中加入定量的酸后测定其pH值,将测得的pH值与脱脂剂浓度采用非线性拟合得出关系函数,进而利用该函数计算得到现场脱脂液中的脱脂剂浓度。对酸的加入量、曲线拟合方式和拟合阶数进行探索并得出最佳试验条件。结果将该方法用于中性脱脂剂浓度的快速测定,测定结果相对标准偏差(Relative Standard Deviation,RSD)为0.85%~1.17%,回收率在98.52%~103.34%之间。结论本研究提出的新方法准确可靠、简便快速,克服了传统滴定法和重量法方法的不足,可以有效指导中性脱脂剂的应用,进而提高金属材料的表面质量。
Objective To establish a rapid method for the determination of neutral degreaser concentration by quantitative acid addition and nonlinear fitting,and to solve the problem of titration method and weighing method lack of accuracy and detection efficiency.Methods Prepare the working curve solutions of different concentrations by using the degreaser original solution,and measure the pH value after adding a quantitative amount of acid.The relationship function between the pH value and the concentration of degreaser is obtained by non-linear fitting,and then the concentration in the production sites degreasing solution is calculated by the function.Explore the amount of acid added,curve fitting method,and fitting order,and determine the optimal experimental conditions.Results The method was applied to the rapid determination of neutral degreaser concentration,with a relative standard deviation(RSD)of 0.85%to 1.17%and a recovery rate between 98.52%to 103.34%.Conclusion The new method proposed in this study is accurate,reliable,simple and rapid.And overcomes the shortcomings of traditional titration and gravimetric methods,it can effectively guide the application of neutral degreaser and improve the surface quality of metal materials.
作者
李绍文
张砚博
刘一凡
LI Shao-Wen;ZHANG Yan-Bo;LIU Yi-Fan(Chinalco Luoyang Copper Co.,Ltd.,Luoyang 471039,China)
出处
《实验室检测》
2024年第5期26-30,共5页
Laboratory Testing
关键词
脱脂剂
中性
浓度
非线性拟合
快速测定
degreaser
neutral
concentration
nonlinear fitting
rapid determination
