Complexometric Titration of Bismuth in Over-the-Counter Stomach Relief Products

Complexometric Titration of Bismuth in Over-the-Counter Stomach Relief Products
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非处方胃缓解产品中铋的络合滴定

DOI:
10.1021/acs.jchemed.2c00764
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发表时间:
2022
影响因子:
3
通讯作者:
Mitchell-Koch, Katie R.
Mitchell-Koch, Katie R.
中科院分区:
化学2区
文献类型:
--
作者:
Steinert, Ryan M.;Heikes, Micah E.;Mitchell-Koch, Jeremy T.;Baker, Gary A.;Mitchell-Koch, Katie R.

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介绍了三种直接络合滴定测定非处方药胃舒缓冲剂和液体中的次水杨酸铋的方法,以及用于学生实验室的UV-Vis分析方法。滴定方法之间的主要区别是指示剂的选择;使用二甲酚橙(XO)、邻苯二酚紫(PV)或碘化钾(KI)。这些方法简单而安全,这使得这项实验在普通化学或分析实验室中是可取的,以便将真实世界的样品分析与理论滴定概念联系起来。介绍了威奇托州立大学(WSU)化学II荣誉实验室、伯特利学院化学导论实验室和密苏里大学(Mizzou)定量分析实验室的学习结果、学生反馈和学生数据。大多数学生喜欢这种真实世界的样本分析;然而,对于更高级的学生来说,滴定结果更准确。以XO为指示剂的EDTA滴定是作者选择的CAPLET分析方法,但以PV或KI为指示剂的方法也是可以接受的,尽管KI方法可能会产生大量的碘废物,这取决于类别的大小。所有的滴定方法在低pH(∼1.5-1.6)下都是选择性的,不受常见离子如镁和钙的干扰。使用这项工作中介绍的滴定程序,所有测试的片剂和液体品牌似乎都符合美国药典(USP)的标准,其中有效成分的允许范围在标签值的90%-110%范围内。
Three direct complexometric titration methods for bismuth subsalicylate determination in over-the-counter stomach relief caplets and liquids are presented, as well as a UV–vis assay, for use in student laboratories. The main difference between titration methods is the choice of indicator; either xylenol orange (XO), pyrocatechol violet (PV), or potassium iodide (KI) is used. These methods are simple and safe, making this experiment desirable in a general chemistry or analytical laboratory to relate real-world sample analysis to theoretical titrimetric concepts. Learning outcomes, student feedback, and student data from Wichita State University (WSU) Chemistry II Honors lab, Bethel College Introduction to Chemistry lab, and University of Missouri (Mizzou) Quantitative Analysis lab are presented. The majority of students enjoyed this real-world sample analysis; however, titration results are more precise for more advanced students. The titration with EDTA using XO as an indicator is the method of choice for caplet analysis by the authors, but methods utilizing PV or KI as indicator are also acceptable, although the KI method may generate large amounts of iodide waste depending on class size. All titration methods presented are selective at low pH (∼1.5–1.6) and do not suffer interferences from commonly occurring ions such as magnesium and calcium. Using the titrimetric procedures presented in this work, all tested caplet and liquid brands appear to meet United States Pharmacopeia (USP) standards, where the allowable range of active ingredient is within 90–110% of label value.
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