Providing a traceable assigned value in a proficiency testing programme on the determination of benzoic acid in orange juice

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• 作者：Shiwan Cheng (1)
  Charline Mesquida (1)
  Ee Mei Gui (1)
  Pui Sze Cheow (1)
  Tong Kooi Lee (1)
  Tang Lin Teo (1)
  
• 关键词：Traceability ; Proficiency testing ; Benzoic acid ; Fruit juice ; Isotope dilution mass spectrometry
• 刊名：Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：19
• 期：6
• 页码：439-443
• 全文大小：198 KB
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• 作者单位：Shiwan Cheng (1)
  Charline Mesquida (1)
  Ee Mei Gui (1)
  Pui Sze Cheow (1)
  Tong Kooi Lee (1)
  Tang Lin Teo (1)
  
  1. Health Sciences Authority, Applied Sciences Group, Chemical Metrology Division, 1 Science Park Road, The Capricorn, Science Park II, #01-05/06, Singapore, 117528, Singapore
  
• ISSN：1432-0517

文摘

A proficiency testing (PT) programme on the determination of benzoic acid in orange juice was organised by the Chemical Metrology Laboratory, Health Sciences Authority, Singapore, for the local food testing laboratories. The PT programme used a metrologically traceable assigned value determined by isotope dilution mass spectrometry to assess the performance of the participating laboratories. This paper discusses the reasons and approach to applying metrological principles to determine the assigned value of a PT programme. The procedure undertaken by the Laboratory to prepare a batch of PT sample, conduct homogeneity and stability testings, as well as value assignment, is presented. The discussions also include the estimation of the measurement uncertainties arising from the characterisation, testing for homogeneity and testing for stability of the PT sample. The Coordinator of the PT programme used the assigned value and its associated measurement uncertainty, together with those of the participating laboratories to assess their performances. Statistical tools applied in the performance evaluations are also presented.