数据评价在鸡蛋壳钙镁含量测定实验中的应用  

Application of data evaluation in the determination of calcium and magnesium content in egg shells

作　　者：马宇一 卢雯 胡敏[1] 向丹 高培红 张雯[1] MA Yuyi;LU Wen;HU Min;XIANG Dan;GAO Peihong;ZHANG Wen(College of Chemistry,Xi an Jiaotong University,Xi an 710049,China)

机构地区：[1]西安交通大学化学学院,陕西西安710049

出　　处：《实验室科学》2023年第3期30-33,共4页Laboratory Science

基　　金：西安交通大学名课程建设项目(2020年)。

摘　　要：数据评价是定量分析的重要内容。以蛋壳中钙镁含量的测定实验为例,对同种方法同一样品单次测量的数据和同一样品用不同方法测量的数据进行了评价。样品分别采用酸碱滴定法和配位滴定法测定,在用G检验法剔除单次测量可疑数据之后,样品的钙镁总含量分别为83.22%和92.57%(以CaCO_(3)的质量分数表示)。然后通过F-t联合检验法得出两种滴定方法所得结果存在显著性差异。通过该实验,学生加深了对数据处理在实际体系中运用的理解。Data evaluation is an important part of quantitative analysis.In the experiment,we used acid-base titration and complexometric titration to measure the total content of calcium and magnesium in egg shells.In the process of data analysis,Grubbs’test was used to eliminate outliers and F-t test was used to compare the two methods.We calculated that the total content of calcium and magnesium in the sample measured by acid-base titration and complexometric titration was 83.22%and 92.57%respectively(represented by the mass fraction of CaCO_(3)).By the results of F-test and t-test,we found that there was a significant difference between the two methods.This experiment improved students’ability of data evaluation in real sample determination.

关 键 词：鸡蛋壳 钙镁含量 酸碱滴定法 配位滴定法 

分 类 号：O61[理学—无机化学] G64[理学—化学]