การพัฒนาวัสดุอ้างอิงรับรองสําหรับวัดธาตุปริมาณน้อยในน้ำดื่ม

Usana Thiengmanee; Nattikarn Kaewkhomdee; Sutthinun Taebunpakut; Charun Yafa

doi:10.60136/bas.v6.2017.212

Authors

Usana Thiengmanee National Institute of Metrology (Thailand)
Nattikarn Kaewkhomdee National Institute of Metrology (Thailand)
Sutthinun Taebunpakut National Institute of Metrology (Thailand)
Charun Yafa National Institute of Metrology (Thailand)

DOI:

https://doi.org/10.60136/bas.v6.2017.212

Keywords:

Reference material, Drinking water, Reference values, Measurement uncertainty

Abstract

Certified reference material of determining trace elements in drinking water has been developed. It is so called Thailand reference material (TRM) issued by the National Institute of Metrology (Thailand) has been initiatively produced under the project of the ASEAN Food Testing Laboratory Committee (AFTLC). The TRM production was prepared from spiking appropriate amount of standard solution containing Cadmium (Cd) Copper (Cu) Iron (Fe) Zinc (Zn) and Lead (Pb) into acidic aqueous solution. This regards using valid procedures for homogeneity and stability studies implemented according to the requirement stated in ISO 17034 - ISO Guide 35 to ensure the quality of CRM. Their property values of TRM were characterized by exact-matching double isotope dilution mass spectrometric (IDMS) technique and their associated uncertainties were then estimated from characterization, homogeneity and stability studies. Referred to Policy on Measurement Traceability for Life Sciences Testing and Forensic Conformity Assessment Bodies (P113-A2LA), results for measurement comparison activities of the International Committee for Weights and Measures (CIPM) participated, e.g., SIM.QM.S2 SIM.QM-S7 and CCOM-K89, could be considered to support for becoming a prospective reference material producer in this region.

References

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INTERNATIONAL ORGANISATION FOR STANDARDIZATION. ISO 17034:2016(en). General requirements for the competence of reference material producers.

INTERNATIONAL ORGANISATION FOR STANDARDIZATION. ISO Guide 35:2006. Reference materials - General and statistical principles for certification

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SIM.QM-S7: Supplementary Comparison Trace Metals in Drinking Water (Draft B Report). 2017.

CCOM-K89: Trace and Essential Elements in Herba Ecliptae (Final Report). 2013.

AMERICAN ASSOCIATION FOR LABORATORY ACCREDITATION (Document Revised 2016). P113-A2LA Policy on Measurement Traceability for Life Sciences Testing and Forensic Conformity Assessment Bodies (CABs).

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