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EURL-HM-22 Proficiency test report: Determination of total As, Cd, Pb, Hg, MeHg and inorganic As in fish

机译：EURL-HM-22能力验证报告：鱼中总砷，镉，铅，汞，甲基汞和无机砷的测定

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摘要

The European Union Reference Laboratory for Heavy Metals in Feed and Food (EURL-HM) organised a proficiency test (EURL-HM-22) for the determination of total As, Cd, Pb, Hg and inorganic As (iAs) in fish to support the Commission Regulation (EC) 1881/2006 setting maximum levels for certain contaminants in foodstuffs. This PT was open only to National Reference Laboratories (NRLs). The reference material "IAEA-436" (Tuna fish flesh homogenate) was used as test item. The finely ground dry powder material was rebottled, relabelled and dispatched to the participants. The reference values of interest were provided by the IAEA, together with an informative value for total Pb. The University of Graz (Austria) was requested to analyse the mass fraction of iAs in the material and reported a truncated value ("less than" 0.005 mg kg-1). Forty two participants from 30 countries registered to the exercise (all EU Member States plus Iceland and Norway). Only one participant could not report results due to technical instrumental problems. Laboratory results were rated using z- (z'- for MeHg) and zeta scores in accordance with ISO 13528:2015. The following relative standard deviations for proficiency assessment (σpt) were set according to the modified Horwitz equation: 13% for total Hg and MeHg; 15% for total As; and 22% for total Cd. No scoring was provided for total Pb and iAs. More than 92% of the participating NRLs reported satisfactory results (according to the z-score) for total As, Cd, Hg and MeHg, thus confirming their ability in monitoring the maximum levels set by the European Regulation (EC) No 1881/2006 for fish commodities. However, only 9 (out of 41) participants reported results for MeHg. Most of the laboratories provided realistic estimates of their measurement uncertainties.
机译：欧盟饲料和食品中重金属参考实验室（EURL-HM）组织了一项能力测试（EURL-HM-22），用于测定鱼类中总砷，镉，铅，汞和无机砷（iAs）的含量委员会法规（EC）1881/2006设定了食品中某些污染物的最高含量。该PT仅向国家参考实验室（NRL）开放。将参考材料“ IAEA-436”（金枪鱼鱼肉匀浆）用作测试项目。将细磨的干粉材料重新装瓶，重新贴标签并分发给参与者。感兴趣的参考值由国际原子能机构提供，并提供了总铅的参考值。要求格拉茨大学（奥地利）分析材料中iAs的质量分数，并报告其截断值（“小于” 0.005 mg kg-1）。来自30个国家/地区的42位参与者注册了该练习（所有欧盟成员国以及冰岛和挪威）。由于技术性仪器问题，只有一名参与者无法报告结果。根据ISO 13528：2015，使用z-（对于MeHg为z'-）和zeta评分对实验室结果进行评分。根据修正的Horwitz方程设置以下用于能力评估的相对标准偏差（σpt）：总Hg和MeHg为13％；总Hg和MeHg为13％。总砷的15％；总镉为22％。没有提供总Pb和iAs的评分。超过92％的参与NRL报告的总As，Cd，Hg和MeHg的结果令人满意（根据z得分），从而证实了其监测欧洲法规（EC）1881/2006所设定的最高水平的能力用于鱼类商品。但是，只有41名参与者中的9名报告了MeHg结果。大多数实验室提供了其测量不确定度的现实估计。

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