REACH对标准物质生产与销售的影响

2007年6月1日欧盟的REACH法规正式生效,为了帮助标准物质生产者和使用者理解法规有关规定,了解这一法规的实施对标准物质生产与销售的影响,对如何遵照法规提出了需要注意的几点建议.     

ISO/REMCO关于标准物质的新定义

对"标准物质(RM)"和"有证标准物质(CRM)"术语进行进一步的解释和说明,以帮助读者对标准物质的定义有正确的理解.     

ISO/REMCO近期活动

介绍ISO/REMCO 2007年已开展的和2008年将要开展的工作.重点介绍ISO/REMCO与标准物质相关的文件制定等一系列工作.     

标准物质新老定义的理解与比较

近年来,国际标准化组织/标准物质委员会(ISO/REMCO)对标准物质进行了重新定义,国际计量学词汇第3版(VIM3)对标准物质赋予新的定义,两组定义存在着一定的差异。对标准物质的新老定义进行了比较。     

高中生对物质结构与性质关系理解的调查研究

利用访谈法对15名高二学生进行研究,通过关注他们是否能利用物质结构与性质的关系来预测物质的性质以及如何利用物质结构与性质的关系来预测物质的性质,得出结论:(1)学生得出正确结论并不意味着真正理解了问题的本质;(2)学生的思维具有多样性,对于同一个问题,他们得出结论的途径五花八门;(3)学生在思考问题时倾向于利用捷径得出结论。     

标准物质讲座(第三讲)国外标准物质的现状

介绍有关国际组织标准物质和国外标准物质的现状。     

正确使用标准物质/标准样品

介绍了标准物质与标准样品、有证与非有证标准物质/标准样品的区别与联系,国內外有证标准物质/标准样品的判断依据,标准物质/标准样品及其证书的科学使用。对正确理解和使用标准物质/标准样品提出了一些建议。     

环境监测分析中标准物质的选择及应用

针对分析人员对标准物质概念不清、使用不规范等问题,就环境监测领域标准物质选择和应用方法做了梳理。从标准物质的概念、区分有证和非有证标准物质的方法、标准物质的应用范围及标准物质的使用注意事项等4个方面系统地进行了梳理,重点阐述了有证标准物质和非有证标准物质的概念区别及使用时的误区,为分析人员在实际工作中出具准确数据提供理论依据。     

ZnAl_(4-1)锌合金标准物质的研制

介绍了ZnAl_(4-1)锌合金标准物质的制备技术和研制过程。并以大量数据表明所研制的ZnAl_(4-1)光谱和化学两种标准物质都具有良好的均匀性和稳定性、定值准确可靠、符合国家一级标准物质的技术要求,达到了美国NIST同类标准物质的先进水平。     

Implementation of ISO Guide 34: Accreditation for reference material production

The National Analytical Reference Laboratory of the Australian Government Analytical Laboratories was initially accredited to ILAC Guide G 12:2000 in January 2000 and is currently accredited to ISO Guide 34 (2000) for the production of a range of pure organic substance reference materials. This paper discusses the practical challenges and rewards of developing and implementing a quality system for reference material production and discusses some of the barriers, and potential solutions, to more general implementation of third-party accreditation.     

Characterization of reference materials: proposal for a simplification of the options listed in ISO Guide 34

ISO Guide 34 and 35 list 4 approaches for the characterization of reference materials. We argue that an approach using “one method of demonstrable accuracy, performed by a network of competent laboratories” will provide method-specific values. Furthermore, as it is impossible to objectively decide whether a method is a reference method or not, the approach using “two or more independent reference methods in one or several laboratories” should be combined with the approach “two or more methods of demonstrable accuracy, performed by a network of competent laboratories.” We therefore propose to replace the four characterization approaches by three in the ongoing revision of ISO Guide 35.     

Outline for the revision of ISO Guide 35

The production of reference materials (RMs) is a key activity for the improvement and maintenance of a worldwide coherent measurement system. As detailed in ISO Guide 33, RMs with different characteristics are used in measurements, such as calibration, quality control and method validation, as well as for the assignment of values to other materials. Currently, ISO Guide 35 is in its third edition after it was revised in 2006. The Guide was developed to support best practices in the value assignment to specified properties of Certified Reference Materials (CRMs). This Guide gives general guidance and explains concepts to assist the understanding and development of valid methods to assign values to the properties of a reference material, including the evaluation of their associated measurement uncertainties, and the establishment of their metrological traceability. From the outcome of a systematic review of ISO Guide 35 among the members of ISO/REMCO, the ISO Committee on Reference Materials, it followed that there is a need for revising the current edition of ISO Guide 35. The mandate for the revision is focused on editorial updates to explain the concepts in more detail. It is not envisaged that major technical changes will be introduced. This paper explains the approach and rationale for the revision of ISO Guide 35 and invites comments from the users of the current edition of ISO Guide 35.     

Summary of ISO/TC 201 standard: XIII,ISO 18114:2003—surface chemical analysis—secondary ion mass spectrometry—determination of relative sensitivity factors from ion‐implanted reference materials

This International Standard specifies a method of determining relative sensitivity factors (RSFs) for secondary ion mass spectrometry (SIMS) from ion‐implanted reference materials. The method is applicable to specimens in which the matrix is of uniform chemical composition, and in which the peak concentration of the implanted species does not exceed one atomic percent. Published in 2006 by John Wiley & Sons, Ltd.     

Summary of ISO/TC 201 standard: XV. ISO 20341:2003—Surface chemical analysis—secondary ion mass spectrometry—method for estimating depth resolution parameters with multiple delta‐layer reference materials

This International Standard specifies procedures for estimating three depth resolution parameters, via the leading‐edge decay length, the trailing‐edge decay length and Gaussian broadening, in SIMS depth profiling using multiple delta‐layer reference materials. This International Standard is not applicable to delta‐layers where the chemical and physical state of the near‐surface region, modified by the incident primary ions, is not in the steady state. Copyright © 2005 John Wiley & Sons, Ltd.