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首页> 外文OA文献 >IMEP-111: Total Cadmium, Lead, Arsenic, Mercury and Copper and Extractable Cadmium and Lead in Mineral Feed - Report of the Eleventh Interlaboratory Comparison Organised by the European Union Reference Laboratory for Heavy Metals in Feed and Food
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IMEP-111: Total Cadmium, Lead, Arsenic, Mercury and Copper and Extractable Cadmium and Lead in Mineral Feed - Report of the Eleventh Interlaboratory Comparison Organised by the European Union Reference Laboratory for Heavy Metals in Feed and Food

机译：IMEP-111：矿物质饲料中的总镉，铅，砷，汞和铜以及可提取的镉和铅-欧盟饲料和食品中重金属参考实验室组织的第十一次实验室间比较的报告

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The Institute for Reference Materials and Measurements (IRMM) of the Joint Research Centre, a Directorate-General of the European Commission, operates the European Union Reference Laboratory for Heavy Metals in Feed and Food (EU-RL-HM). One of its core tasks is to organize interlaboratory comparisons (ILCs) among appointed National Reference Laboratories. This report presents the results of the eleventh proficiency test (PT) of the EU-RL-HM which focused on the determination of total Cd, Pb, As, Hg and Cu and extractable Cd and Pb in mineral feed according to Directive 2002/32/EC of the European Parliament and of the Council on undesirable substances in animal feed.The test material used in this exercise was the Certified Reference Material (CRM) BCR-032, Moroccan phosphate rock. The material was relabelled to prevent identification by the participants and was dispatched the second half of October 2010. Each participant received one bottle containing approximately 100 g of test material. Thirty-one laboratories from 26 countries registered to the exercise of which 28 reported results for total Cd and total Pb, 25 for total Hg and total Cu, 23 for total As and for extractable Cd and extractable Pb. The assigned values (Xref) for total Cd, As and Cu are the indicative values taken from the BCR-032 certificate. The assigned values (Xref) for total Pb, total Hg and for extractable Cd and Pb were provided by IRMM using isotope dilution-inductively coupled plasma-mass spectrometry (ID-ICP-MS).For total Cd, As, Hg and Cu and for extractable Cd, the uncertainty of the assigned values (uref) was calculated by combining the uncertainty of the characterization (uchar) and a contribution for between-bottle homogeneity (ubb) (which was calculated from the certification report). For total and extractable Pb the number of replicates performed to establish the assigned value was higher (11 replicates) than for the other measurands (6 replicates). Since the aliquots were taken from different bottles, it was assumed that uchar included a contribution for the homogeneity. For total Cd, As and Cu, uchar were taken from the CRM certificate as indicated by the producer. For extractable Cd the same uchar as for total Cd was used. For total Pb and Hg and for extractable Pb, uchar was calculated according to the ISO Guide for the Expression of Uncertainty in Measurement (GUM). Participants were invited to report the uncertainties of their measurements. This was done by the majority of the laboratories taking part in this exercise.
机译：联合研究中心的参考材料和测量研究所（IRMM）是欧盟委员会的总司，负责运营欧盟饲料和食品中重金属参考实验室（EU-RL-HM）。它的核心任务之一是在指定的国家参考实验室之间组织实验室间比较（ILC）。本报告介绍了EU-RL-HM的第十一次能力测试（PT）的结果，该测试着重于根据2002/32号指令测定矿物质饲料中的总Cd，Pb，As，Hg和Cu以及可萃取的Cd和Pb欧洲议会和理事会关于动物饲料中有害物质的/ EC。本练习中使用的测试材料是摩洛哥参考磷酸盐岩石认证参考材料（CRM）BCR-032。为防止与会人员识别材料而重新贴上标签，并于2010年10月下旬将其分发。每位与会人员都收到了一瓶装有约100克测试材料的瓶子。来自26个国家的31个实验室进行了注册，其中28个实验室报告了Cd和Pb总量，Hg和Cu总量的25个，As总量以及Cd和Pb的23个结果。总Cd，As和Cu的分配值（Xref）是从BCR-032证书中获取的指示值。 IRMM使用同位素稀释-电感耦合等离子体质谱法（ID-ICP-MS）提供总Pb，总Hg以及可萃取Cd和Pb的赋值（Xref）。总Cd，As，Hg和Cu对于可萃取的Cd，将特征的不确定性（uchar）与瓶间均匀性的贡献（ubb）结合起来计算得出分配值（uref）的不确定性（从认证报告中计算得出）。对于总铅和可萃取铅，执行以建立指定值的重复次数（11次重复）要比其他被测物（6次重复）要高。由于等分试样取自不同的瓶子，因此可以认为uchar包含了均一性。对于总的Cd，As和Cu，从生产商指示的CRM证书中提取了uchar。对于可萃取的Cd，使用与总Cd相同的uchar。对于总Pb和Hg以及可萃取Pb，根据ISO计量不确定度表达指南（GUM）计算uchar。邀请参与者报告其测量的不确定性。这是由参加此练习的大多数实验室完成的。

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