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Bunthoon Laongsri Cheerapa Boonyakong Nongluck Tangpaisarnkul Chainarong Cherdchu 《Accreditation and quality assurance》2007,12(3-4):194-200
It has not been long that metrology is well accepted as an important part in analytical chemistry since it helps the chemists
to receive the best measurement and accurate results with traceability. The National Institute of Metrology Thailand (NIMT),
which is a public agency under the supervision of the Ministry of Science and Technology, not only focuses on physical standards
but also provides and maintains standards in chemical field. pH measurement is one of the most widely used in the laboratories
including industries and medical area in Thailand. The chemical laboratory starts working on the project with the objective
of disseminating an accurate result in routine pH measurement. In 2002, the laboratory provided a service in calibration of
pH meter and organized the first local interlaboratory comparison program (NIMT–C-ILC-1: pH buffer) in pH measurement. There
were three buffer solution samples in the range of acid, neutral, and base. A total of 44 laboratories participated in this
program. The NIMT chemical laboratory also participated in the proficiency testing program that was conducted by PSB Corporation
Testing Group in Singapore. In 2003, NIMT started research in preparation of secondary buffers by using highly accurate pH
meters with glass electrode systems. The laboratory produced three secondary buffers, which were pH 4.01, 6.86, and 9.18 with
uncertainty 0.020 pH at 25°C. The competence of the laboratory was shown by the measurement results of the pilot study (APMP.QM-P06),
which was organized by the APMP electrochemical analysis working group (EAWG/TCQM) in 2005. The title of this study was “pH
determination of two phosphate buffers by Harned cell method and glass electrode method”. NIMT aims to achieve for establishment
of the primary method for pH measurement in the near future.
Presented at -- “BERM-10” -- April 2006, Charleston, SC, USA 相似文献
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