国际标准ISO 4937滴定法测定铬的评估与修订  

Evaluation and revision of ISO 4937 titration method for determination of chromium

作　　者：缪乐德[1] 张毅[1] 于永波 MIAO Lede;ZHANG Yi;YU Yongbo(Central Research Institute,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201999,China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,上海201999

出　　处：《冶金分析》2024年第8期1-10,共10页Metallurgical Analysis

摘　　要：国际钢标准化技术委员会化学成分测定方法分技术委员会(ISO/TC17/SC1)于2022年第32次会议上通过修订ISO 4937《钢和铁铬含量的测定电位或可视滴定法》的决议。该修订项目拟采用ISO 5725和ISO TR 21074分析ISO 4937国际共同实验数据,并重新计算可视滴定法和电位滴定法的方法精密度,评估方法的适用范围,以符合当前分析需求和分析技术实际水平。本文主要介绍ISO 4937标准修订过程中可视滴定法和电位滴定法共同实验结果的统计与评估过程,通过采用F检验比较了两种方法在不同钒含量样品检测中精密度是否存在显著差异;结果表明可视滴定法在检测钒含量大于6 mg的样品时才显示与电位滴定方法在精密度上有显著差异。通过本次修订,ISO 4937可视滴定部分也适用于称样量中钒含量3~6 mg的样品,拓展了可视滴定法的适用性,通过对精密度的重新统计与评估,与原标准相比,修订后的重现性和再现性都将有显著提高。Revision of ISO 4937 Steel and cast iron-Determination of chromium content-Potentiometric or visual titration method has been approved by the methods of determination of chemical composition sub-technical committee of ISO technical committee steel(ISO/TC17/SC1)at the 32nd meeting.The revision project intends to use ISO 5725 and ISO TR 21074 to analyze the international precision results of ISO4937,recalculate the precision of visual titration and potential titration,and evaluate the scope of ap-plication of the method to meet the current analytical needs and technical realities.This paper mainly intro-duces the statistical and evaluation process of the experimental results of visual titration and potentiometric titration in the revision of ISO 4937.The F-test is used to compare whether there are significant differ-ences in the precision of the two methods in the detection of samples with different vanadium content.The results show that the precision of visual titration is significantly different from potentiometric titration when determinating samples with vanadium content greater than 6 mg in test portion.Through this revi-sion,the visual titration procedure of ISO 4937 is also applicable for samples with 3-6 mg vanadium content in test portion,which expand the applicable scope of visual titration method.Through the re-statistics and evaluation of precision,the reproducibility and reproducibility of the revised would be significantly im-proved compared with the original version.

关 键 词：可视滴定法 电位滴定法 铬含量 ISO 4937 ISO 5725 ISO TR 21074 

分 类 号：O655.2[理学—分析化学] TF031[理学—化学]