Borax buffer solution for pH measurement: Homogeneity and stability studies and its application in the proficiency testing program
DOI:
https://doi.org/10.5599/jese.467Keywords:
Sodium tetraborate decahydrate, pH measurements, Proficiency testing scheme, ISO 17043, ISO 17025
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 2016PT 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.
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References
SNI ISO/IEC 17043: Conformity Asessment-General Requirements For Proficiency Testing (2010).
Y. Mitani, J. V. Lara-Manzano, A. Rodriguez-Lopez, Accreditation and Quality Assurance 13 (2008) 421-426.
ILAC Secretariat, Benefits for Laboratories Participating in Proficiency Testing Programs, ILAC, Silverwater, Australia, 2008.
I. Mann, B. Brookman, Selection, Use and Interpretation of Proficiency Testing (PT) Schemes, Second Edition, Eurachem, 2011.
SNI ISO/IEC 17025: General Requirements for the Competence of Testing and Calibration Laboratories (2008).
F. B. Gonzaga, J. C. Dias, D. Jehnert, B. Werner, K. Schräpler, L. Vyskočil, Electroanalysis 25 (2013) 1955-1959.
Critical factors affecting pH measurement, http://www.jumo.ch/media/PDFs/Press/white-paper/JUMO_Critical_Factors_pH_Measurement.pdf (Accessed on 31 August 2017)
MiC Laboratory, Report of Citric Buffer Solution (LBS15), LIPI, Serpong, Indonesia, 2015.
M. F. Palupi, R. A. Sari, U. Partriana, D. Widyarimbi, E. Rusmiati, et al., National Technical Meeting for Agricultural Functional, Proceedings, Bogor, Indonesia, 2006, p 37-42.
F. G. K. Baucke, Journal of Electroanalytical Chemistry 368 (1994) 67-75.
Y. D. Mustopo, Effect of Time on Thickness and Adhesivity layer in Electroplating Process of Chrome Decorative without Basic Layer with Copper Basic Layer and Copper-Nickel, Department of Mechanical Engineering, Technical Faculty of UNS, Solo, Indonesia, 2011.
ISO 13528: Statistical Methods for Use in Proficiency Testing by Interlaboratory Comparison (2015).
R. P. Buck, S. Rondinini, A. K. Covington, F. G. K Baucke, C. M. A. Brett, M. S. Camoes, M. J. T. Milton, T. Mussini, R. Naumann, K. W. Pratt, P. Spitzer, G. S. Wolsin, Pure and Applied Chemistry 74 (2002) 2169-2200.
P. Spitzer, Accreditation and Quality Assurance 6 (2001) 55-60.
Federman Neto, A., A. D. L. Borges, M. A. S. Lavrador, Journal of Basic and Applied Pharmaceutical Sciences 27 (2006) 63-72.
J. C. Gust, 4th ILAC Proficiency Testing Consultative Group, A Discussion of Stability and Homogeneity Issues in Proficiency Testing for Calibration Laboratories, Vienna, Autria, 2006.
R. Iavetz, Statistical Manual-Chemical Proficiency Testing, Australian Government Department of Industry, Innovation and Science, National Measurement Institute, Australia, 2016.
J. Pauwels, A. Lamberty,H. Schimmel, Accreditation and Quality Assurance 3 (1998) 51-55.
J. C. Ulrich, J. E. d. S. Sarkis, 16th International Congress of Metrology, Estimation of Uncertainty to the Homogeneity Study in the Certification of a Candidate Certified Reference Material in Fish Matrix, Paris, France, 2013.
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