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Production of Certified pH Buffer Solutions at National Metrology Institute of Turkey

Yıl 2019, , 1747 - 1758, 31.12.2019
https://doi.org/10.18185/erzifbed.618740

Öz



pH,
a thermodynamic function, is the negative logarithm of the activity of
hydronium ions. It is well-known concept used in many different areas from
science to industry. The widespread use of pH measurements has increased the
need for certified reference solutions in this field. The primary pH
measurement system that was established in Turkey as the first and only was
used for production and certification of reference pH buffer solutions. The
system consists of measurement cell named as Harned cell, Ag/AgCl electrodes,
Pt/Pt
black or Pt/Pdblack electrodes, thermostatic bath,
PT-100 probe and display unit, data acquisition unit and barometer. The
software of primary system was developed and validated in TUBITAK UME. Moreover,
high precision coulometry system has been used to determine the acid molality
utilized at first step of primary level pH measurement system. Homogeneity,
short and long term stability, characterization, certification
  and post-production studies were performed
according to ISO Guide 34: 2009, ISO Guide 35: 2006 and ERM Application Note
1: 2010 for the production and evaluation of the results of certified pH
buffer solutions. Thanks to this situation, traceability will be disseminated
through TUBITAK UME directly. Moreover the foreign currency spent for these
solutions, that are generally used for calibration of pH meters and used in
many other areas, will be retained in the country.


 


Destekleyen Kurum

TÜBİTAK UME

Proje Numarası

G3RM-E1-08-I

Teşekkür

This study was the internal project of TUBITAK UME, Electrochemistry Laboratory with a project code “G3RM-E1-08-I” and named as “Production of Certified Reference Solutions for pH Measurement and Calibration”. The authors would like to thank to TUBITAK UME for infrastructure and financial support.

Kaynakça

  • Buck, R. P., Rondinini, S., Covington, A. K., Baucke, F. G. K., Brett, C. M. A., Camões, M. F., Milton, M. J. T., Mussini, T., Naumann, R., Pratt, K. W., Spitzer, P., Wilson, G. S. 2002. “Measurement of pH. Definition, Standards, and Procedures (IUPAC Recommendations 2002)”, International Union of Pure and Applied Chemistry, 74, 2169-2200.
  • International Organization for Standardization (ISO). (2006). “Reference materials – General and statistical principles for certification”, ISO, Switzerland.
  • International Organization for Standardization (ISO). (2009). “General requirements for the competence of reference material producers”, ISO, Switzerland.
  • IUPAC. (1993). “Quantities, units and symbols in physical chemistry”, Blackwell Scientific, United Kingdom.
  • Jakobsen, P. T. (2014). “DFM measurement report for CCQM-K99 pH of physiological phosphate buffer”, DFM, Denmark.
  • JCGM. (2008). “Evaluation of measurement data – Guide to the expression of uncertainty in measurement”, JCGM, France.
  • Linsinger, T. (2010). “Application note 1: Comparison of a measurement result with the certified value”, IRMM, Belgium.
  • Milton, M. J. T., Wielgosz, R. I. (1999). “New consensus on pH measurements and their traceacility to the SI – a submission to the CCQM 1999”, NPL, United Kingdom.
  • Sørensen, S. P. L., Linderstrøm-Lang, K. L. 1924. “On the Determination and Value of π0 in Electmetric Measurement of Hydrogen-Ion Concentration”, Comptes-rendus des travaux du Laboratoire Carlsberg, 15, 6.
  • Vyskočil, L., Máriássy, M., Mathiasová, A. (2001). “pH – Measurement and traceability in Slovakia”, SMU, Slovakia.

Türkiye Ulusal Metroloji Enstitüsü’nde Sertifikalı pH Tampon Çözeltilerinin Üretimi

Yıl 2019, , 1747 - 1758, 31.12.2019
https://doi.org/10.18185/erzifbed.618740

Öz

Termodinamik bir fonksiyon olan pH, hidronyum iyonlarının
aktivitesinin eksi logaritması olarak tanımlanmaktadır. pH, bilimden endüstriye
kadar çok farklı alanlarda kullanılan, iyi bilinen bir kavramdır. pH
ölçümlerinin yaygın kullanımı bu alanda sertifikalı referans çözelti ihtiyacını
arttırmıştır. Türkiye’de ilk ve tek olarak kurulan
birincil seviye
pH ölçüm sistemi referans pH tampon çözeltilerinin üretim ve sertifikasyonu
için kullanılmıştır. Sistem, Harned hücresi olarak isimlendirilen bir ölçüm
hücresi, Ag/AgCl elektrotları,
Pt/Ptsiyah
veya Pt/Pdsiyah elektrotları, termostatik banyo, PT-100 probu ve
göstergesi, veri toplama ünitesi ve barometreden oluşmaktadır. Sistemin
yazılımı TÜBİTAK UME’de geliştirilmiş ve valide edilmiştir. Ayrıca,
birincil seviye
pH ölçüm sisteminin ilk aşamasında kullanılan asitin molalitesinin tayini
yüksek kesinlikte kulometri cihazı kullanılarak yapılmıştır.
Sertifikalı pH tampon çözeltilerinin üretimi ve
sonuçların değerlendirilmesi için homojenlik, kısa ve uzun dönem kararlılık,
karakterizasyon, sertifikasyon ve sertifikasyon sonrası izleme çalışmaları ISO
Rehberi 34: 2009, ISO Rehberi 35: 2006 ve ERM Uygulama Notu 1: 2010 dokümanlarına
göre gerçekleştirilmiştir. Bu durum sayesinde izlenebilirlik TÜBİTAK UME
üzerinden doğrudan sağlanacaktır. Ayrıca genellikle pH metrelerin kalibrasyonu
için ve pek çok diğer alanda kullanılan bu çözeltiler için harcanan döviz
ülkede kalacaktır.

Proje Numarası

G3RM-E1-08-I

Kaynakça

  • Buck, R. P., Rondinini, S., Covington, A. K., Baucke, F. G. K., Brett, C. M. A., Camões, M. F., Milton, M. J. T., Mussini, T., Naumann, R., Pratt, K. W., Spitzer, P., Wilson, G. S. 2002. “Measurement of pH. Definition, Standards, and Procedures (IUPAC Recommendations 2002)”, International Union of Pure and Applied Chemistry, 74, 2169-2200.
  • International Organization for Standardization (ISO). (2006). “Reference materials – General and statistical principles for certification”, ISO, Switzerland.
  • International Organization for Standardization (ISO). (2009). “General requirements for the competence of reference material producers”, ISO, Switzerland.
  • IUPAC. (1993). “Quantities, units and symbols in physical chemistry”, Blackwell Scientific, United Kingdom.
  • Jakobsen, P. T. (2014). “DFM measurement report for CCQM-K99 pH of physiological phosphate buffer”, DFM, Denmark.
  • JCGM. (2008). “Evaluation of measurement data – Guide to the expression of uncertainty in measurement”, JCGM, France.
  • Linsinger, T. (2010). “Application note 1: Comparison of a measurement result with the certified value”, IRMM, Belgium.
  • Milton, M. J. T., Wielgosz, R. I. (1999). “New consensus on pH measurements and their traceacility to the SI – a submission to the CCQM 1999”, NPL, United Kingdom.
  • Sørensen, S. P. L., Linderstrøm-Lang, K. L. 1924. “On the Determination and Value of π0 in Electmetric Measurement of Hydrogen-Ion Concentration”, Comptes-rendus des travaux du Laboratoire Carlsberg, 15, 6.
  • Vyskočil, L., Máriássy, M., Mathiasová, A. (2001). “pH – Measurement and traceability in Slovakia”, SMU, Slovakia.
Toplam 10 adet kaynakça vardır.

Ayrıntılar

Birincil Dil İngilizce
Konular Mühendislik
Bölüm Makaleler
Yazarlar

Lokman Liv 0000-0001-8008-1012

Emrah Uysal 0000-0001-5783-1874

Proje Numarası G3RM-E1-08-I
Yayımlanma Tarihi 31 Aralık 2019
Yayımlandığı Sayı Yıl 2019

Kaynak Göster

APA Liv, L., & Uysal, E. (2019). Production of Certified pH Buffer Solutions at National Metrology Institute of Turkey. Erzincan University Journal of Science and Technology, 12(3), 1747-1758. https://doi.org/10.18185/erzifbed.618740