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Journal of Electrochemical Science and Engineering, Vol. 8 No. 3, 2018.

Professional paper

https://doi.org/10.5599/jese.467

Borax buffer solution for pH measurement: Homogeneity and stability studies and its application in the proficiency testing program

Nurhani Aryana ; Metrology in Chemistry Research Group, Research Centre for Metrology-Indonesian Institute of Sciences (RCM-LIPI), Building No. 456, Kawasan PUSPIPTEK, Serpong 15314, Tangerang Selatan-Banten, Indonesia
Ayu Hindayani ; Metrology in Chemistry Research Group, Research Centre for Metrology-Indonesian Institute of Sciences (RCM-LIPI), Building No. 456, Kawasan PUSPIPTEK, Serpong 15314, Tangerang Selatan-Banten, Indonesia
Oman Zuas orcid id orcid.org/0000-0002-0101-5277 ; Metrology in Chemistry Research Group, Research Centre for Metrology-Indonesian Institute of Sciences (RCM-LIPI), Building No. 456, Kawasan PUSPIPTEK, Serpong 15314, Tangerang Selatan-Banten, Indonesia
Fransiska S. H. Krismastuti ; Metrology in Chemistry Research Group, Research Centre for Metrology-Indonesian Institute of Sciences (RCM-LIPI), Building No. 456, Kawasan PUSPIPTEK, Serpong 15314, Tangerang Selatan-Banten, Indonesia

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Abstract

This paper describes the preparation of borax buffer solution and its application as proficiency testing (PT) test samples in a PT scheme. The test samples were made gravimetrically from 0.01 M sodium tetraborate decahydrate and pH of the test samples were measured by using a differential potentiometric cell. Homogeneity and stability of test samples were evaluated in accordance to ISO13528:2015. The results obtained revealed that test samples met the PT requirement criteria in terms of stability and homogeneity. The prepared PT test samples were used in the 2016 PT scheme. From the results received from 50 participants, it was found that about 44 % of participants achieved satisfactory results, 38 % achieved unsatisfactory results, while the remaining participants (about 18 %) showed a questionable result.

Keywords

Sodium tetraborate decahydrate; pH measurements; Proficiency testing scheme; ISO 17043; ISO 17025

Hrčak ID:

201120

URI

https://hrcak.srce.hr/201120

Publication date:

17.5.2018.

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