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Charun Yafa Sirinapha Srithongtim Pranee Phukphatthanachai Araya Thiparuk Nittaya Sudsiri Laddawan Rojanapantip Mayuree Uraroongroj Panawan Kluengklangdon Preeyaporn Jaengkarnkit Kittipong Sirisuthanant Chamoy Thonglue Thanida Pimma Paramee Pengpreecha Tippaya Julwee Fortune Ratirot Zwicker Vorapot Permnamtip Sirinart Laoharojanaphnad Boonlert Suanmamuang Juwadee Shiowatana Weerawan Waiyawat Atitaya Siripinyanond Kunchit Judprasong Benjawan Boonsong Suwaluck Talaluck Chainarong Cherdchu 《Accreditation and quality assurance》2010,15(4):223-231
Reference materials play an important role for evaluating the accuracy of analytical results, and are essential parts of good laboratory practice. They represent a key tool for quality control of chemical analyses. In Thailand, the demand of food and environmental reference materials is constantly increasing, and the National Institute of Metrology (NIMT, Thailand) is responding to the urgent needs for affordable materials, which require collaborative efforts at the national level. This paper describes the preparation of a new glutinous rice reference material, along with homogeneity and stability studies and the analytical work carried out for the certification of the contents of inorganic elements. The incurred material was collected from an actual rice paddy field. Material preparation along with homogeneity and stability testing were carried out at the Environmental Research Training Centre (ERTC). The homogeneity study was designed to have three experimental conditions; (A) 10 bottles of candidate materials being analyzed each with 2 replicates, (B) 20 bottles with 2 replicates, (C) 10 bottles with 7 replicates, in order to study the suitable treatments for homogeneity testing in the reference material production. It was shown that a minimum number of 10 bottles with duplicate analyses are enough to demonstrate the homogeneity of candidate reference material. Certification of a candidate reference material in a single laboratory using reference method was confirmed with an interlaboratory comparison participated by a certain number of well recognized testing laboratories in Thailand. Further elaborative results will be discussed. 相似文献
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