共查询到20条相似文献,搜索用时 0 毫秒
1.
Proficiency testing (PT) results have been used to improve traceability in chemical drinking water analysis. With a generalized
least-square regression the mass concentrations of As and Sb were calculated in a drinking water that had been used to prepare
proficiency testing samples by a spiking procedure. From the mass concentrations in the matrix and the spiked amounts, reference
values with an uncertainty budget could be calculated without the need for reference measurements. The degree to which these
reference values can be regarded as traceable is discussed. The results showed slight deviations in some samples between reference
values and consensus means. 相似文献
2.
Weiping Wang Jiang Zheng Daniel W. Tholen Zhijun Cao Xingan Lu 《Accreditation and quality assurance》2005,10(4):140-143
A statistical strategy for discouraging collusion in split-level proficiency testing schemes was developed. When the samples are randomly labeled, the difference in the analyte levels in the two samples can be designed to maximize the probability of detecting collusion when it occurs, so that participants who colluded cannot easily receive satisfactory assessments. This favors providing convictive assessments of participants proficiency and giving the participants a level playing field. 相似文献
3.
Accreditation and Quality Assurance - Participation in proficiency testing schemes is necessary and beneficial for all testing laboratories across the world. Laboratories in developing countries... 相似文献
4.
5.
Bauke te Nijenhuis Karin Heutinck Ben van Schijndel 《Analytical and bioanalytical chemistry》2001,369(7-8):741-743
Participation in proficiency testing schemes (PT-schemes) is an important way to prove and to improve the skills of analytical chemical students. It gives valuable information on the professional capabilities of the students and is thus an important step in the training of laboratory engineers and technicians. In the programme described three types of samples are offered to the students: chemical, environmental and clinical samples. A guiding protocol presents instructions to the participating student groups. Standard operating procedures are available, but the students are also free to select their own method. The results are methodologically and statistically judged by professional PT-organisers and are presented in the customary way: the dataset, the mean (consensus) value of all participants and the Z-scores. The final presentation of the results takes place in an annual symposium where awards are presented to the best performing student groups, and a lecture programme is presented with subjects in the area of quality assurance and quality control. A selection of results from the KILO/PT/1998–1999 and the KILO/PT/1999–2000 programme is presented. 相似文献
6.
te Nijenhuis B Heutinck K van Schijndel B 《Fresenius' Journal of Analytical Chemistry》2001,369(7-8):741-743
Participation in proficiency testing schemes (PT-schemes) is an important way to prove and to improve the skills of analytical chemical students. It gives valuable information on the professional capabilities of the students and is thus an important step in the training of laboratory engineers and technicians. In the programme described three types of samples are offered to the students: chemical, environmental and clinical samples. A guiding protocol presents instructions to the participating student groups. Standard operating procedures are available, but the students are also free to select their own method. The results are methodologically and statistically judged by professional PT-organisers and are presented in the customary way: the dataset, the mean (consensus) value of all participants and the Z-scores. The final presentation of the results takes place in an annual symposium where awards are presented to the best performing student groups, and a lecture programme is presented with subjects in the area of quality assurance and quality control. A selection of results from the KILO/PT/1998-1999 and the KILO/PT/1999-2000 programme is presented. 相似文献
7.
Analysis of historical data from the Aquacheck proficiency testing scheme demonstrates improvement in the performance of participants correlated to the frequency of participation. Analysis of the spread of results returned by all participants, defined by the percentage relative standard deviation (RSD) and the performance (Z) scores awarded to the individual participants, indicates that the overall performance for the group of participants is consistent. However, when the frequency of participation is analysed, it can be clearly seen that those laboratories who participated in the majority of the distributions available reported 10–15% more acceptable (Z-scores between +2 and ?2) results than those labs who took part with a greatly reduced frequency. When ‘more difficult’ analytes are considered, those laboratories who participated in greater than 75% of available rounds reported up to 30% more acceptable results than those laboratories who participated in 25% or fewer, of the available rounds. 相似文献
8.
Research activity in the Balkan and East Mediterranean countries was evaluated on the basis of publications appearing in Analytical Abstracts (AA) during the cumulative 8-year period of 1994-2001. This was accomplished by assessing the scientific publication productivity in analytical chemistry as the number of publications from each country and the number of publications per population unit. To assess the impact in the scientific community, the mean impact factor for each country was calculated. The publication productivity trend was recorded for the 7-year period 1994-2000. Moreover, the preference to publish in specific journals per country was appraised. According to the total number of publications, Egypt (765 publications) and Greece (717 publications) are the most productive countries, while Slovenia shows the highest number of publications per million of population (140). Scientists from Israel published their work in the highest impact analytical journals with a mean impact factor of 2.02, followed by Slovenia (mean impact factor of 1.67) and Greece (mean impact factor of 1.53). Studies of scientists from different countries do not show any obvious preference to a single specific journal. It is interesting to note that preference for journals reveals the research interests of scientists from each country for sub-fields of analytical chemistry. 相似文献
9.
Adriaan M. H. van der Veen 《Accreditation and quality assurance》2001,6(4-5):160-163
The evaluation of measurement uncertainty, and that of uncertainty statements of participating laboratories will be a challenge
to be met in the coming years. The publication of ISO 17025 has led to the situation that testing laboratories should, to
a certain extent, meet the same requirements regarding measurement uncertainty and traceability. As a consequence, proficiency
test organizers should deal with the issues measurement uncertainty and traceability as well. Two common statistical models
used in proficiency testing are revisited to explore the options to include the evaluation of the measurement uncertainty
of the PTRV (proficiency test reference value). Furthermore, the use of this PTRV and its uncertainty estimate for assessing
the uncertainty statements of the participants for the two models will be discussed. It is concluded that in analogy to Key
Comparisons it is feasible to implement proficiency tests in such a way, that the new requirements can be met.
Received: 29 September 2000 Accepted: 3 December 2000 相似文献
10.
Daniel Tholen 《Accreditation and quality assurance》2011,16(12):603-605
A sound system of competent measurements, underpinned by standards and accreditation, is an essential component of the infrastructure
of any modern society. Proficiency Testing is an indispensible tool for developing and maintaining this infrastructure. It
is used to verify compliance with standards, for ongoing monitoring of laboratory performance, for demonstration of competence,
and for evaluating the performance of measurement procedures; it is used to indicate performance problems that might not be
detected otherwise; and it is used as a tool for education and self-improvement. The new International Standard, ISO/IEC 17043,
contains requirements and recommendations to make optimal use of this important tool. 相似文献
11.
Nordion International Inc., in cooperation with the Thai Office of Atomic Energy for Peace (OAEP) and the Canadian International Development Agency (CIDA) recently completed a unique food irradiation technology transfer project in Thailand. This complete food irradiation technology transfer project included the design and construction of an automatic multipurpose irradiation facility as well as the services of construction and installation management and experts in facility operation, maintenance and training.
This paper provides an insight into the many events that led to the succesful conclusion of the world's first complete food irradiation technology transfer project. 相似文献
12.
N. P. Boley Paul De Bièvre Philip D. P. Taylor Adam Uldall 《Accreditation and quality assurance》2001,6(6):244-251
Many laboratories take part in proficiency testing schemes, external quality assessment programmes and other interlaboratory
comparisons. These have many similarities but also important differences in their modus operandi and evaluation of performance of participating laboratories. This paper attempts to highlight both the similarities and differences. It also puts particular emphasis on requirements
called ”target values for uncertainty” and their meaning.
Received: 24 January 2001 Accepted: 25 January 2001 相似文献
13.
Leyva-Morales J. B. Bastidas-Bastidas P. J. Muñiz-Valencia R. Ceballos Magaña S. G. Ponce-Vélez G. Aguilera-Márquez D. Grajeda-Cota P. Navidad-Murrieta M. S. Flores-Munguía M. E. Ramírez-Castillo J. A. Romero-Bañuelos C. A. Ruíz-Ramos R. Aguilar-Zarate G. Huerta-Beristain G. 《Accreditation and quality assurance》2019,24(6):451-461
Accreditation and Quality Assurance - An interlaboratory comparison exercise was performed to assess the technical proficiency of laboratories in measuring the organochlorine pesticides in drinking... 相似文献
14.
根据国家地表水环境质量监测网监测任务要求和环境监测的实际需要,制备了水中易释放氰化物能力验证样品。通过均匀性、稳定性检验以及量值一致性评价,研制的样品均匀性良好,在3℃~6℃冷藏避光保存条件下1年内稳定,样品配制值与多家实验室协作测定结果一致。探讨了样品在能力验证活动中的应用,共有来自全国11个省的32家实验室参加了水中易释放氰化物的能力验证计划,实验室满意率在80%以上,实验室结果出现有问题或不满意主要是由于样品前处理以及检测过程质量控制不当导致的。经检测及实验室反馈的数据验证,该能力验证样品能够应用于能力验证活动。 相似文献
15.
Enumeration of lactic acid bacteria: lacuna and improvement areas highlighted by proficiency testing
Abdel Massih Marleen Planchon Viviane Pitchugina Elena Mahillon Jacques 《Accreditation and quality assurance》2019,24(5):381-385
Accreditation and Quality Assurance - During the 2011 to 2018 food microbiology proficiency testing (PT) schemes organized by REQUASUD, a systematic analytical issue was detected. For the... 相似文献
16.
Petras Serapinas 《Accreditation and quality assurance》2007,12(11):569-574
Good correspondence between evaluations of the proficiency testing data for water measurements according to different scoring
schemes was found as a result of implementation of the measurement quality according to the target uncertainty defined in
the Drinking Water Directive. The accuracy of the evaluation is determined by the uncertainty of the assigned value, and this
uncertainty should be in correspondence with the target uncertainty. Modification of the zeta-score by the thorough application of the target uncertainty is presented. It is convenient for generalised presentation of
the proficiency testing data. The allowed bias is included as a linear term on the measured value scale, as it is treated
in uncertainty analysis. The importance of implementation of the target measurement uncertainty in other fields of the routine
measurements is indicated. 相似文献
17.
The history, origin, and development of a system for monitoring and assessing water and other environmental laboratories in
the Czech Republic is described. The system started in 1991 and has matured to its present complexity with similarities to
the accreditation systems found in other countries. Differences from internationally recognized procedures are being corrected
step by step. During the first year of its existence ASLAB, as part of its brief, organised proficiency testing (PT) programs
for fifty laboratories. Today the total number of regularly participating laboratories exceeds 700 from the Czech Republic,
the Slovak Republic, and Germany. This paper describes the ASLAB PT system, discusses some experiences with its use, and describes
the use of PT results in assessment of the competence of laboratories.
Received: 12 October 2000 Accepted: 7 January 2001 相似文献
18.
Ulf Örnemark Harald Fostel Rolf Straub Johannes van de Kreeke 《Accreditation and quality assurance》2004,9(11-12):729-732
This paper focuses on policies and requirements concerning the frequency for participation in proficiency testing (PT) and provides an overview of the frequency for which PT activities are offered in 25 testing fields. Recent international surveys are summarised. 相似文献
19.
Axel Colling Martyn Jeggo Helder Louvandini Mamadou Lelenta Mark Robinson 《Accreditation and quality assurance》2008,13(1):33-45
Quality systems, established to internationally accepted standards, are one mechanism that can assist in evaluations of the
sustainability of technology transfer, the proficiency of the user, and the reliability and comparability of data generated,
resulting in potential enhancement of laboratory credibility. The means of interpreting existing standards and implementing
quality systems in developing country veterinary diagnostic laboratories has become a significant adjunct to the technology
transfer element within the Food and Agriculture/ International Atomic Energy Agency, FAO/IAEA programme. The FAO/IAEA External
Quality Assurance Programme (EQAP) is given as an example for an initial step towards enhancing the “quality” culture in developing
country veterinary laboratories. In 1995 the EQAP began as an effort to assure that test results emanating from laboratories
using FAO/IAEA ELISA kits for animal disease diagnosis are valid. For this purpose 15 international external quality-assurance
rounds have been performed to date for a variety of animal diseases e.g. Rinderpest, brucellosis, trypanosomosis, and foot-and-mouth
disease (FMD). Results indicate that the EQAP is a valuable tool in the assessment of both the results provided by, and use
of the ELISA kits provided through, the joint FAO/IAEA programme. Furthermore EQAP can assist laboratory diagnosticians to
enhance quality control/quality assurance (QC/QA) procedures for conducting FAO/IAEA ELISAs and to advise on the implementation
of similar QC/QA procedures in other laboratory activities. Based on the experiences made during the implementation of the
EQAP a proposal for establishing a quality system standard was ratified through the World Organization for Animal Health (OIE)
general conference in May 2000. The OIE Standard On Management And Technical Requirements For Laboratories Conducting Tests
For Infectious Animal Diseases is based on ISO 17025 and provides a clear formula for establishing quality systems in veterinary
diagnostic laboratories world-wide. 相似文献
20.
rnemark Ulf Fostel Harald Straub Rolf van de Kreeke Johannes 《Accreditation and quality assurance》2004,9(11):729-732
This paper focuses on policies and requirements concerning the frequency for participation in proficiency testing (PT) and provides an overview of the frequency for which PT activities are offered in 25 testing fields. Recent international surveys are summarised.
相似文献