ＭＰＴ－ＡＥＳ法测定牛奶中钙镁质量浓度的不确定度评定

辽宁石油化工大学学报 ›› 2012, Vol. 32 ›› Issue (4): 8-12.

ＭＰＴ－ＡＥＳ法测定牛奶中钙镁质量浓度的不确定度评定

蔚永清，张金生，李丽华^＊，赵文涛，张小燕，杨　杰，杨宏娟

辽宁石油化工大学化学与材料科学学院，辽宁抚顺１１３００１

收稿日期:2012-04-28 出版日期:2012-12-20 发布日期:2017-07-06
作者简介:蔚永清（１９８４－），男，内蒙古凉城县，在读硕士

Evaluation of Uncertainty in the Determination of  Calcium and Magnesium in Milk by MPT-AES

YU Yong-qing, ZHANG Jin-sheng, LI Li-hua^*, ZHAO Wen-tao, ZHANG Xiao-yan, YANG Jie, YANG Hong-juan

School of Chemistry and Materials Science, Liaoning Shihua University, Fushun Liaoning 113001, P.R.China

Received:2012-04-28 Published:2012-12-20 Online:2017-07-06

摘要/Abstract

摘要： 　研究了微波等离子体原子发射光谱法测定钙、镁质量浓度的各种不确定度因素，评定了该方法测定钙、镁质量浓度的不确定度。实验结果表明，两个综合性因素（方法的精密度和准确度）以及取样过程是方法不确定度的主要来源，另外，校准溶液浓度的不确定度是评定镁质量浓度不确定度的主要来源；在置信水平为９５％和包含因子ｋ＝２的条件下，测定钙、镁质量浓度的扩展不确定度分别为１８．６和３．２ｍｇ／Ｌ。

关键词: 　微波等离子体原子发射光谱法 , 　测量不确定度 , 　牛奶 , 　钙 , 　镁

Abstract: The measurement uncertainty was estimated for the determination of calcium and magnesium in milk using microwave plasma torch atomic emission spectrometry (MPT-AES) and the uncertainty parameters were discussed and compared in detail. The results show that the "whole method" performance parameters, such as precision and recovery, and sampling are the three main contributors to uncertainty. In addition, the content of calibration solution is the main contributor to measurement uncertainty in the determination of magnesium. When coverage factor k=2 and confidence level approximately 95%, the expanded uncertainties were determined as 18.6 and 3.2 mg/L for Ca and Mg, respectively.

Key words: Microwave plasma torch-atomic emission spectrometry , Measurement uncertainty , Milk , Calcium , Magnesium

蔚永清，张金生，李丽华，赵文涛，张小燕，杨　杰，杨宏娟. ＭＰＴ－ＡＥＳ法测定牛奶中钙镁质量浓度的不确定度评定[J]. 辽宁石油化工大学学报, 2012, 32(4): 8-12.

YU Yong-qing, ZHANG Jin-sheng, LI Li-hua, ZHAO Wen-tao, . Evaluation of Uncertainty in the Determination of  Calcium and Magnesium in Milk by MPT-AES[J]. Journal of Liaoning Petrochemical University, 2012, 32(4): 8-12.