Accreditation and Quality Assurance最新文献_第8页

Some pitfalls in the uncertainty evaluation of isotope delta reference materials 同位素δ标准物质不确定度评定中的一些缺陷

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2023-01-11 DOI: 10.1007/s00769-022-01527-6

Manfred Gröning

{"title":"Some pitfalls in the uncertainty evaluation of isotope delta reference materials","authors":"Manfred Gröning","doi":"10.1007/s00769-022-01527-6","DOIUrl":"10.1007/s00769-022-01527-6","url":null,"abstract":"<div><p>The Guide to the Expression of Uncertainty in Measurement (GUM) provides a framework for evaluating analytical data and characterizing their dispersion in a consistent manner. This is of eminent importance in the case of reference materials and their recommended values that are used for calibration of further measurements. The proper propagation of uncertainties for those data is essential. Guidance is provided in the GUM on how to calculate the combined standard uncertainty for a mean value or central value based on multiple individual measurements including their calibration uncertainty. However, according to published data, the guidance provided by GUM is not always properly applied in practice. Several published studies show calculated uncertainties much lower than those of input quantities. This may be caused by improper handling of the propagation of uncertainty components, thereby breaking the traceability chain for reported values. A simple check method using conventional statistical means is proposed to detect and to avoid such mistakes related to calibration uncertainties. It is intended to help to ensure a proper uncertainty propagation, to maintain a system of reliable and traceable reference materials. A spreadsheet is provided for the implementation of such a check. Example calculations for published data are presented.</p></div>","PeriodicalId":454,"journal":{"name":"Accreditation and Quality Assurance","volume":"28 3","pages":"101 - 114"},"PeriodicalIF":0.9,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00769-022-01527-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4460970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On testing of the homogeneity of variances for two-side power distribution family 双侧配电族方差齐性检验

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2022-12-13 DOI: 10.1007/s00769-022-01525-8

A. V. Stepanov, A. G. Chunovkina

引用次数: 0

Correction to: Evaluation of reproducibility uncertainty in micropipette calibrations for non‑nominal volumes through an interlaboratory study 修正:通过实验室间研究对非标称体积微移管校准的可重复性不确定度进行评估

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2022-12-01 DOI: 10.1007/s00769-022-01524-9

Katsuhiro Shirono, Hideyuki Tanaka

引用次数: 0

Complying with the resource requirements of ISO/IEC 17025:2017 in Indonesian calibration and testing laboratories: current challenges and future directions 符合印尼校准和测试实验室ISO/IEC 17025:2017资源要求:当前挑战和未来方向

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2022-10-19 DOI: 10.1007/s00769-022-01523-w

Fransiska Sri Herwahyu Krismastuti, Muhammad Haekal Habibie

引用次数: 0

The units of rate constants in chemical kinetics 化学动力学中速率常数的单位

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2022-10-11 DOI: 10.1007/s00769-022-01515-w

Jeremy Frey, Timothy J. Wallington, Richard Hartshorn, Martin Quack, Pascal Heus, Steven Emmerson

{"title":"The units of rate constants in chemical kinetics","authors":"Jeremy Frey, Timothy J. Wallington, Richard Hartshorn, Martin Quack, Pascal Heus, Steven Emmerson","doi":"10.1007/s00769-022-01515-w","DOIUrl":"10.1007/s00769-022-01515-w","url":null,"abstract":"<div><p>This short article discusses the units of rate constants as used in chemical kinetics and, in particular, the aspect of non-integral powers of base units, which some might find unusual for units in the SI system. In many ways the fact that the units of the rate constants as usually defined convey information about the order of the reaction or reactions involved is very useful, but in other ways having the same (or at least very similar) quantity that has different units under different conditions is not so desirable. Furthermore, just as with chemical equilibrium constants, taking functions of the rate constant (such as the logarithm when representing the Arrhenius equation in the form ln <span>(k,{text {vs.}},1/T)</span>) needs special attention. Here we examine a possible alternative definition of rate constants in terms of an explicit ratio to the concentration standard state and although we acknowledge that this approach unlikely to be adopted by the community, it serves as a basis to discuss the meaning of rate constants.</p></div>","PeriodicalId":454,"journal":{"name":"Accreditation and Quality Assurance","volume":"28 3","pages":"115 - 119"},"PeriodicalIF":0.9,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00769-022-01515-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4778798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a certified reference material for benzo[a]pyrene and benz[a]anthracene in olive oil 开发橄榄油中苯并[a]芘和苯并[a]蒽的认证标准物质

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2022-09-30 DOI: 10.1007/s00769-022-01517-8

Ting Lu, Ee Mei Gui, Juan Wang, Pui Sze Cheow, Tang Lin Teo, Tong Kooi Lee

{"title":"Development of a certified reference material for benzo[a]pyrene and benz[a]anthracene in olive oil","authors":"Ting Lu, Ee Mei Gui, Juan Wang, Pui Sze Cheow, Tang Lin Teo, Tong Kooi Lee","doi":"10.1007/s00769-022-01517-8","DOIUrl":"10.1007/s00769-022-01517-8","url":null,"abstract":"<div><p>This paper describes the development of an olive oil certified reference material containing benzo[a]pyrene and benz[a]anthracene. A method combining solid phase extraction and gas chromatography-isotope dilution mass spectrometry was used for the assignment of certified values and long-term stability study. The method was demonstrated to be suitable for the value assignment of both polycyclic aromatic hydrocarbons (PAHs) as our result was in good agreement with those from other metrology institutes in an international comparison (CCQM-K146) on determination of benzo[a]pyrene in olive oil. A metrological approach was taken to consider potential biases when certifying the mass fraction values of these two PAHs. The certified values with their associated uncertainties at approximately 95 % confidence level obtained for benzo[a]pyrene and benz[a]anthracene in olive oil were 9.85 µg/kg ± 0.75 µg/kg and 8.05 µg/kg ± 0.48 µg/kg, respectively. The measurement uncertainty was obtained by combining the uncertainty contributions from characterisation, homogeneity and stability of the material. Since the mass fraction levels of PAHs in the CRM are about five times higher than the regulatory limits or quantification limits, the practical use of the CRM is as a positive control for PAH monitoring in edible oil samples.\u0000</p></div>","PeriodicalId":454,"journal":{"name":"Accreditation and Quality Assurance","volume":"27 6","pages":"319 - 329"},"PeriodicalIF":0.9,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00769-022-01517-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4043735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new methodology for proficiency testing scheme interpretation based on residual analysis 基于残差分析的能力测试方案解释新方法

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2022-09-19 DOI: 10.1007/s00769-022-01522-x

Luiz Henrique da Conceição Leal, Fernando Gustavo Marques Violante, Lucas Junqueira de Carvalho, Bruno Carius Garrido, Eliane Cristina Pires do Rego, Gabriel Fonseca Sarmanho, Werickson Fortunato de Carvalho Rocha

{"title":"A new methodology for proficiency testing scheme interpretation based on residual analysis","authors":"Luiz Henrique da Conceição Leal, Fernando Gustavo Marques Violante, Lucas Junqueira de Carvalho, Bruno Carius Garrido, Eliane Cristina Pires do Rego, Gabriel Fonseca Sarmanho, Werickson Fortunato de Carvalho Rocha","doi":"10.1007/s00769-022-01522-x","DOIUrl":"10.1007/s00769-022-01522-x","url":null,"abstract":"<div><p>Proficiency testing schemes by interlaboratory comparisons are used to determine the performance of individual laboratories for specific tests or measurements. The international standard ISO 13528:2015 provides a description of statistical methods used for achieving this goal; one of these methods is the <i>z</i> score. The standard allows each participant to choose a measurement method and this can lead to inhomogeneity between participant variance known as heteroscedasticity. The ISO 13528:2015 standard does not mention heteroscedasticity in its statistical procedures. This paper describes a new approach, based on residuals analysis, to assess the performance of an interlaboratory comparison for determining the presence of benzoic acid in orange juice. The results indicate that the conclusions (using <i>z</i> scores) and the proposed approach are different for some laboratories. This occurs due to violation of the homoscedasticity assumption. The <i>z</i> score procedure does not consider this assumption violation while residual analysis can provide such information. Feasible generalized least squares allow one to deal with non-homoscedasticity.\u0000</p></div>","PeriodicalId":454,"journal":{"name":"Accreditation and Quality Assurance","volume":"27 6","pages":"349 - 357"},"PeriodicalIF":0.9,"publicationDate":"2022-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4773838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Risk management approach for testing and calibration laboratories 测试和校准实验室的风险管理方法

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2022-09-12 DOI: 10.1007/s00769-022-01521-y

Michelly Karoline Alves Santana, Geilson Loureiro

引用次数: 0

Purity analysis of 4-bromodiphenyl ether for reference materials 标准物质4-溴联苯醚的纯度分析

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2022-09-12 DOI: 10.1007/s00769-022-01518-7

Ling Chen, Zhipeng Liu, Jinyan Zhou, Siting Luo, Junbin Xu, Yanjie Huang, Zerong Liao

引用次数: 0

Allergenic proteins in wine: an overview of results obtained from proficiency-tests 葡萄酒中的过敏原蛋白:从熟练程度测试中获得的结果概述

IF 0.9 4区工程技术

Accreditation and Quality Assurance Pub Date : 2022-09-09 DOI: 10.1007/s00769-022-01519-6

Caterina Mazzoni, Anne Tirard, Abdelkader Boubetra

{"title":"Allergenic proteins in wine: an overview of results obtained from proficiency-tests","authors":"Caterina Mazzoni, Anne Tirard, Abdelkader Boubetra","doi":"10.1007/s00769-022-01519-6","DOIUrl":"10.1007/s00769-022-01519-6","url":null,"abstract":"<div><p>Food allergy is a significant health problem, and food industry is obliged to provide accurate labelling by clearly indicating the presence of some allergens to protect consumers. This issue concerns also winemakers as the EU Commission Implementing Regulation No. 579/2012 of 29 June 2012 establishes that wines treated with allergenic additives or processing aids are subject to specific labelling if their presence can be detected in the final product. The request of analyses of allergens in wines has increased in recent years, and laboratories therefore have a key role to play in this process. The most performed method for detection and quantification of proteins in wine is the ELISA method, thanks to its performances, ease to use and relatively moderate costs of equipment. However, the analysis of allergens in wine remains a challenge for laboratories, which can choose from an increasing number of kits that differ in allergen extraction method and are likely to estimate diverse forms of the researched protein. To allow laboratories to compare their results and to obtain recognition of their analytical procedures by winemakers and accreditation bodies according to the ISO/IEC 17025 standard, regular proficiency-testing schemes (PTS) for the detection and quantification of allergenic proteins in wine have been proposed since June 2014. For each test, the statistical treatment of the laboratories’ results is performed according to ISO 13528. Results obtained in different tests for analyses of casein, ovalbumin and lysozyme on red, white and rosé wines show that these analyses are well managed by laboratories, even if some drawbacks are encountered especially for some matrices whose physico-chemical properties can interact with the searched allergen.</p></div>","PeriodicalId":454,"journal":{"name":"Accreditation and Quality Assurance","volume":"27 5","pages":"289 - 294"},"PeriodicalIF":0.9,"publicationDate":"2022-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4403655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0