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Reference Materials in Measurement and Technology

RMMT 2018: Reference Materials in Measurement and Technology pp 107–121Cite as

Development of a Reference Material for the Composition of 0.1M Potassium Dichromate Solution. Certified Reference Material GSO 10992-2017

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Abstract

This paper describes key stages in the development and investigation of a high-precision certified reference material (CRM) for the composition of potassium dichromate solution. The proposed reference material (RM) exhibits metrological traceability to the units of the International System of Units (SI). Not requiring additional preparation before use, the CRM is convenient for use as a titrant in redox titration. The metrological characteristics of the developed CRM were determined by the direct primary method of coulometric titration using the State Primary Standard GET 176. A procedure for measuring the molar concentration of potassium dichromate is described, along with the equipment used. A comprehensive uncertainty budget for the measurements is assembled. The interval of permissible certified values of the molar concentration of potassium dichromate in the CRM under study is set to vary from 0.098 to 0.102 mol/dm3. The relative expanded uncertainty (k = 2) of the certified value of potassium dichromate molar concentration is calculated to be 0.024%, with the relative standard uncertainties caused by long-term and short-term instability each being equal to 0.0044%. The shelf life of the developed CRM is found to be 1 year, provided that storage conditions are ensured. The developed CRM is included into the State Register of Certified Reference Materials under the number GSO 10992-2017. The CRM can be used for transferring the mass (molar) concentration unit of a component to RMs and chemical reagents via oxidation-reduction reactions; the verification and calibration of measuring instruments (MI), as well as control of metrological characteristics during MI trials including type approval; MI graduation; validation of measurement procedures; control of measurement results when determining the mass (molar) fraction and mass (molar) concentration of components in liquid and solid substances and materials.

Keywords

  • Coulometry
  • Coulometric titration
  • Titrimetry
  • State primary standard
  • GET 176
  • Potassium dichromate solution
  • Reference material
  • Certified value uncertainty
  • Potassium dichromate
  • Traceability

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Notes

  1. 1.

    State standard reference material of the first class (CRM) 2215—potassium dichromate RM. Available at Rosstandart: https://fgis.gost.ru/fundmetrology/registry/19/items/393979.

  2. 2.

    GET 176-2017 State primary standard for units of mass (molar) fraction and mass (molar) concentration of a component in liquid and solid substances and materials based on coulometry. Available at Federal State Unitary Enterprise UNIIM: https://uniim.ru/gauge_fgup_uniim/

  3. 3.

    Calibration and Measurement Capabilities. Amount of substance, High purity chemicals, Russian Federation. Available at: https://kcdb.bipm.org/appendixC/QM/RU/QM_RU_1.pdf.

  4. 4.

    CAS No. 7778-50-9 Potassium dichromate solution. Available at: https://www.carlroth.com/en/en/Chemicals/A-Z-Chemicals/P/Potassium-dichromate-solution-%280%2C1-N%29/Potassium-dichromate-solution/p/000000010000965500020023_en.

  5. 5.

    Potassium dichromate solution. Available at: https://www.sigmaaldrich.com/catalog/product/mm/109118?lang=en&region=RU.

  6. 6.

    Potassium dichromate standard titre (Technical Specification). Available at: http://himreactiv.com/catalog/20799/.

  7. 7.

    Potassium dichromate standard titre. Available at: http://www.upcr.ru/catalog/gso_i_standart_titry/.

  8. 8.

    GSO 10992-2017 Certified reference material for the composition of potassium dichromate solution (0.1М K2Cr2O7, CRM UNIIM). Available at: http://www.fundmetrology.ru/09_st_obr/view.aspx?regn=%D0%93%D0%A1%D0%9E%2010992-2017.

Abbreviations

GET 176:

State primary standard of units of mass (molar) fraction and mass (molar) concentration of components in liquid and solid substances and materials based on coulometry GET 176-2017;

RM:

Reference material;

CRM:

Certified reference material;

MI:

Measuring instrument;

BIPM:

Bureau International des Poids et Mesures—International Bureau of Weights and Measures;

CMC:

Calibration and measurement capabilities.

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Author Contribution Statement

A. V. Sobina: development of the research concept, organization of the research, methodological support, preparation of the manuscript.

A. Yu. Shimolin: development of the research concept, performance of measurements and calculations, preparation of documents for the CRM certification, preparation of the manuscript.

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Authors and Affiliations

  1. Ural Scientific Research Institute for Metrology (FGUP UNIIM), Ekaterinburg, Russia

    Alexander Yu. Shimolin & Alena V. Sobina

Authors
  1. Alexander Yu. Shimolin
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  2. Alena V. Sobina
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Corresponding author

Correspondence to Alexander Yu. Shimolin .

Editor information

Editors and Affiliations

  1. Ural Scientific Research Institute for Metrology, Ekaterinburg, Russia

    Dr. Sergei V. Medvedevskikh

  2. Ural Scientific Research Institute for Metrology, Ekaterinburg, Russia

    Olga N. Kremleva

  3. A.P. Vinogradov Institute of Geochemistry Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia

    Dr. Irina E. Vasil’eva

  4. Ural Scientific Research Institute for Metrology, Ekaterinburg, Russia

    Dr. Egor P. Sobina

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Shimolin, A.Y., Sobina, A.V. (2020). Development of a Reference Material for the Composition of 0.1M Potassium Dichromate Solution. Certified Reference Material GSO 10992-2017. In: Medvedevskikh, S., Kremleva, O., Vasil’eva, I., Sobina, E. (eds) Reference Materials in Measurement and Technology. RMMT 2018. Springer, Cham. https://doi.org/10.1007/978-3-030-32534-3_11

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