Abstract
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.
References
Barwick V, Burke S, Lawn R, Roper P, Walker R (2001) Application of reference materials in analytical chemistry. The Royal Society of Chemistry, Cambridge, UK
Park CJ, Suh JK (1997) J Anal At Spectrom 12:573–577
International Organisation for Standardisation, Certification of Reference Materials–General and Statistical Principles (2006) ISO Guide 35-2006(E) (2006). ISO, Geneva
Walker R, Lawn R, Roper P, Holcombe G, Stuart B (2001) Low-Cost QC laboratory reference materials investigation of cost-effective production procedures. LGC/VAM/2001/009, LGC, London, UK
International Organisation for Standardisation (2009) General requirements for the competence of reference material producers, Draft ISO Guide 34-2009(E). ISO, Geneva
Myors RB, Nolan AL, Shane A, Saxby DL, Hearn R, Mackay LG (2005) J Anal At Spectrom 20:1051–1057
Pauwels J, Lambert A, Schimmel H (1998) Accred Qual Assur 3:180
Pauwels J, Van der Veen AMH, Lambert A, Schimmel H (2000) Accred Qual Assur 5:95
Linsinger TPJ, Pauwels J, Schimmel H, Lambert A, Van der Veen AMH, Schumann G, Siekmann L (2000) Fresenius J Anal Chem 368:589
Van der Veen AMH, Pauwels J (2000) Accred Qual Assur 5:464
Van der Veen AMH, Linsinger TP, Pauwels J (2001) Accred Qual Assur 6:26
Acknowledgments
We gratefully acknowledge assistance from Dr. Pantip Klomjek of Naresuan University and Mr. Chaiwat Phadermrod of the Padaeng Industry Public Company Limited in the collection of the starting material. We are in debt to ERTC member of staffs, Sununtha Boonprakong, Watjarin Panyasa, Nuttaporn Sukhakasikorn, Phornjit Mungwongsa, Prakong Kotarapong, Wichai Rattanasriboonya, and Kamonchanok Tiyawan, for their hard work in the preparation of candidate material. Special thanks go to the Thailand Institute of Nuclear Technology (TINT) for facilitating the radiation of the sample. Finally, we would like to express our deep appreciation to the National Institute of Metrology, Thailand (NIMT) for sponsoring this project.
Author information
Authors and Affiliations
Corresponding author
Additional information
Presented at BERM-12, July 2009, Oxford, UK.
Rights and permissions
About this article
Cite this article
Yafa, C., Srithongtim, S., Phukphatthanachai, P. et al. New reference material for analysis of elements in glutinous rice produced at the National Institute of Metrology (Thailand). Accred Qual Assur 15, 223–231 (2010). https://doi.org/10.1007/s00769-009-0621-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00769-009-0621-9