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| Proficiency Testing of Potassium Permanganate Consumption in Food Contact Materials and Its Application Assessment |
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| DOI： |
| KeyWord:food contact materials potassium permanganate consumption proficiency testing statistic analysis |
| Author | Institution |
| DONG Jing，YANG Zhao-ying，YU Li-bo，DAI Li-xue，BU Dan-dan，LEI Si-jia，CHEN Dong-dong，PENG Tao |
Chinese Academy of Inspection and Quarantine，Beijing ，China |
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| Abstract: |
| Faced with the increasingly perfect health standard system for food contact materials，this paper has implemented the proficiency testing（PT） for the determination of potassium permanganate consumption in food contact plastic materials，in order to master the technical requirements for the determination of potassium permanganate consumption，conducting the corresponding compliance judgments and giving full play to the role of proficiency testing for technical ability supervision and quality improvement of inspection and testing institutions．The brown plastic packaging bottles used in food were customized as relevant proficiency testing samples．The homogeneity and stability were evaluated according to the requirements of relevant standards，and robust statistical techniques were used for the collected results．The assigned value and the standard deviation of the performance assessment were determined by Algorithm A，and the influencing factors that may lead to unsatisfactory results were analyzed．There are 192 participating laboratories in this proficiency test，of which 179 obtained satisfactory results，with a satisfaction rate of 93.2%，and 12 laboratories got unsatisfactory results，accounting for 6.3%，and 1 laboratory got suspicious results，accounting for 0.5%．This proficiency testing activity contributed to PT provider a certain understanding of the testing level of laboratories in this field．The overall results presented by the laboratories were satifactory，while the reason for unqualified results of individual laboratories could be analyzed through this proficiency testing so as to achieve the purpose of improving the detection capability. |
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