Consideration in potential titration paths to assay osmium compounds: toward the establishment of the mono-elemental standard solution

Asakai, Toshiaki

doi:10.1007/s00769-020-01437-5

Cited by 1 publication

(1 citation statement)

References 40 publications

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“…The process, therefore, plays a key role in the accuracy of standardization of iron(III). One of the authors has discussed several appropriate standardization procedures through the iodine liberation reaction for strong oxidants such as iodate, cerium(IV), bromate, periodate, dichromate, and osmium(VIII). − The accuracy of the titrimetric procedure for iron(III) would be lower than that for these strong oxidants because the lower oxidizing ability of iron(III) would lead to a smaller oxidation rate of iodide ions. Longer experimental time would lead to larger biases due to side reactions such as the oxidation of iodide ions by atmospheric oxygen and the volatilization of generated iodine.…”

Section: Introductionmentioning

confidence: 99%

Reliability in Standardization of Iron(III) and Titanium(III) Solutions in Volumetric Analysis

Asakai

Suzuki

2021

ACS Omega

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Titanium(III) is a useful strong reductant and is usually standardized with iron(III) in volumetric analysis. Iron(III) is widely used as an oxidant and is usually standardized with thiosulfate ions through an iodine liberation reaction. The evaluation of the standardization procedure for iron(III) with thiosulfate ions is therefore essential to ensure the reliability of standardized titanium(III) solutions. To investigate the titration procedure for iron(III), two different titrations were performed: redox titration with thiosulfate ions through an iodine liberation reaction and chelatometric titration with disodium dihydrogen ethylenediaminetetraacetate. Subsequently, for the investigation of standardization of iron(III), titanium(III) was assayed through two titration paths: redox titration with standardized iron(III) and redox titration with standard potassium dichromate. The reliability of titrimetric procedures was evaluated by applying several different stoichiometric reactions to each chemical. All titrimetric procedures were consistent with each other within their expanded uncertainties and were capable of providing reliable volumetric standards with careful operations presented in this study.

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