Application of direct and indirect methods for determining the mass fraction of the main component in flotation potassium chloride-Reference-Cited by-同舟云学术

Application of direct and indirect methods for determining the mass fraction of the main component in flotation potassium chloride

Published:2022-01-17 Issue:4 Volume:17 Page:65-84
ISSN:2687-0886
Container-title:Measurement Standards. Reference Materials
language:
Short-container-title:Stand. obraz.

Author:

Sobina E. P.¹^ORCID,Sobina A. V.¹^ORCID,Shimolin A. Yu.¹^ORCID,Tabatchikova T. N.¹,Lebedeva E. L.¹^ORCID,Migal’ P. V.¹^ORCID,Krasheninina M. P.¹

Affiliation:

1. UNIIM - Affiliated Branch of the D.I. Mendeleev Institute for Metrology

Abstract

The article is devoted to the comparison of two approaches to determining the purity of metal salts on the example of a complex in composition object - flotation potassium chloride. The results of determining the mass fraction of the main component (potassium chloride) in flotation potassium chloride obtained by direct (using the coulometric titration method with correction for anions titrated with the determined chloride ion and an excess of cations) and indirect (according to the scheme 100% minus the amount of impurities with regard to their species) methods. It is shown that direct and indirect methods give well consistent results: (96.08 ± 0.17) % and (96.11 ± 0.12) %, respectively. Also, the measurement results obtained using the standard installations considering the uncertainty are well consistent with the certified value of the mass fraction of potassium chloride (96.11 ± 0.11) %, obtained based on an interlaboratory experiment in laboratories that perform measurements in accordance with GOST 20851.3. The feature of the direct and indirect methods implemented in this work is the construction of a model of the chemical composition of the analysed object based on a priori and experimental data using two basic principles when summing up the content of impurities: the conditions of material balance and the principle of electroneutrality.

Publisher

Ural Research Institute of Metrology (UNIIM)

Subject

General Medicine

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