Interlaboratory comparison for the determination of pesticide residues in Chinese cabbage |
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Authors: | Byungjoo Kim Seonghee Ahn Yoshito Mitani |
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Institution: | (1) Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science, Yuseong, Daejeon, 305-340, Korea;(2) Centro Nacional de Metrologia, Municipio deEl Marques, 76246 Queretrao, Mexico |
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Abstract: | The results of and findings from an interlaboratory comparison among laboratories carrying out food testing of pesticide residues
in the APEC (Asia–Pacific Economic Cooperation) region are presented and discussed to show critical roles of chemical metrology
infrastructure in establishing traceability of measurements and in supporting existing measurement capability in safety and
quality of food trade. The study material, which was prepared and certified by Korea Research Institute of Standards and Science
(KRISS), was freeze-dried Chinese cabbage powder fortified with two organophosphorous pesticides (diazinon and chlorpyrifos).
Among 14 participants, 12 laboratories were accredited based on ISO/IEC17025 and one laboratory was under assessment for the
accreditation at the time of this study. Though all participants demonstrated very good intra-day repeatability and inter-day
intermediate precision, many of them showed a large bias from the certified values. It is suggested that in addition to the
accreditation system, economies are encouraged to develop appropriate chemical metrology infrastructure, which could effectively
support laboratories to assure measurement traceability to SI, for which NMIs could play significant roles through their metrological
services recognized in Mutual Recognition Arrangement (MRA) of the International Committee for Weights and Measures (Comité
International des Poids et Mesures, CIPM). |
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Keywords: | |
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