称重法配制标准溶液研究及其不确定度评估.pdf

2010年12月
岩矿测试
Vol 29. No6
December 2010
ROCK AND MINERAL ANALYSIS
文章编号:0254-5357(2010)06-0729-06
称重法配制标准溶液硏究及其不确定度评估
马新荣,王蕾,温宏利,现爱华
(国家地质实验测试中心,北京100037)
摘要:在标准溶液配制及稀释的过程中放弃了传统的定量移液管,采用精密电子天平作为定量工具。精
密电子天平准确度高,重复性好,不需考虑溶液黏度、管口流速等因素对不确定度的影响,而且明显地降低
了在标准溶液逐級稀释过程中由于读数、操作等原因产生的误差,可实现大比例稀释,操作简便。根据
《化学分析中不确定度的评估指南》(CNAI/AC07:2002)评定了此方法与传统溶液配制方法的不确定度。
利用电感耦合等离子体原子发射光语法(ICP-AES)验证了其准确性和线性,均获得满意结果。本法适用
于ICP-AES法测定样品中的主元素(含量在x%~x%)时的标准溶液配制,也可应用于原子荧光光语、
原子吸收光谱等仪器系列标准溶液的配制。
关键词:称重法;标准溶液配制;不确定度评定;电感耦合等离子体发射光谱法
中图分类号:0213;TQ421.31;0655.2
文献标识码:B
Study on Standard Solution Preparation with Weighting Method and
Its Uncertainty Evaluation
MA Xin-rong, WANG Lei, WEW Hong-li, GONG Ai-hua
National Reseach Center for Geoanalysis, Beijing 100037, China
Abstract: A new method for standard solution preparation was introduced, which utilized the sophisticated
electronic balance as a quantitative tool in place of traditional quantitative tubes in standard solution preparation
and dilution. Both the accuracy and repeatability by new method are good and without considering the influence
factors, such as solution viseosity, on uncertainty. And the new method also greatly reduced the errors from scale
reading and dilution operation etc. in gradual dilution of standard solutions. Based on Guide to Uncertaint
Evaluation in Chemistry Analysis (CNAI/AG07 2002), the uncertainties from the new and traditional methods
were evaluated. The accuracy and linearity of the new method were also tested by ICP-AES determination of
analytes with satisfactory results. The method is suitable for the preparation of calibration solutions in
determination of the major components with concentration range of x% m ax% by ICP-AES and preparation of
calibration solutions in AFS and AAS analysis
Key words: weighting method; standard solution preparation; uncertainty evaluation; inductively coupled
plasma-alomic emission spec trometry
标准溶液是已知准确浓度的溶液。配制标准液和标准工作溶液。
溶液通常有直接法和标定法炳种,在仪器分析中
传统的标准溶液酛制方法通常以休积作为定
通常采用直接法配制。标准溶液包插标准储备浴量的依据,即准确称取一定量的基准物质,溶解后
收稿日期:2009-12-20;修订日期:2010-05-15
基金项目:国家地质实验测试中心基本科研业务费项目资助(2009CS04
作者简介:马新荣(1980-),女,北京人,工程师,从事分析化学专业工作。E-mail:maxinrong@eags.ac.cn。