| Автор | Aspila, K. I. |
| Автор | Chau, A. S. Y. |
| Дата выпуска | 1991 |
| dc.description | Interlaboratory quality assurance studies (external QA) are effective techniques to monitor the performance of laboratories analyzing environmental constituents. Environment Canada through the National Water Research Institute conducts intercomparison studies on waters, sediments and fish for inorganic and toxic organic constituents. Over 400 laboratories in Canada and the United States are involved in eight different ongoing external QA programs. Most studies include over 50 laboratories that analyze 15 to 30 different constituents in ten different samples. Data sets are addressed by non‐parametric statistics (ranking) in order to discern laboratory measurement bias (a systematic error high or low). Individual sample results that deviate significantly from interlaboratory medians are flagged either very high, high, low, or very low. In large studies (10 samples, 50 labs, 20 constituents) excellent performance is recognized when a laboratory has a very low frequency of flags and bias. Poor performance is identified when laboratories have a high frequency of bias and flags. Performance over time is analyzed through a data base management system (System 2000) and evidence clearly indicates many laboratories improving. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Тема | Quality assurance |
| Тема | environment |
| Тема | performance |
| Тема | interlaboratory studies |
| Название | Assessing the performance of laboratories in large external quality assurance programs |
| Тип | research-article |
| DOI | 10.1080/08989629108573792 |
| Electronic ISSN | 1545-5815 |
| Print ISSN | 0898-9621 |
| Журнал | Accountability in Research |
| Том | 1 |
| Первая страница | 177 |
| Последняя страница | 193 |
| Аффилиация | Aspila, K. I.; Research and Applications Branch, National Water Research Institute |
| Аффилиация | Chau, A. S. Y.; Research and Applications Branch, National Water Research Institute |
| Выпуск | 3 |
| Библиографическая ссылка | Aspila, K. I. February 1989. Manual for Effective Interlaboratory Quality Assurance, February, Burlington, Ontario L7R 4A6: National Water Research Institute, P.O. Box 5050. NWRI Contribution No. 89–99 |
| Библиографическая ссылка | Youden, W. J. 1969. “Ranking Laboratories by Round‐Robin Tests”. In Precision Measurement and Calibration, NBS Special Publication 300 Edited by: Ku, Harry H. Vol. 1, 165–9. 169–13. Washington, DC: US Government Printing Office. |
| Библиографическая ссылка | Youden, W. J. and Steinet, E. H. 1975. Statistical Manual of the Association of Official Analytical Chemists, 20044Washington, DC: AOAC, P.O. Box 540, Benjamin Franklin Station. |
| Библиографическая ссылка | Clark, J. L. April 8–10 1981. “Evaluation of Performance of Laboratories Determining Water Quality Constituents through Natural Water Samples Whose True Values are Unknown. In Summary of Conference Presentations”. In Envirometrics, Vol. 81, April 8–10, 54–55. Virginia: Alexandria. |
| Библиографическая ссылка | Aspila, K. I., White, R. E. and Clark, J. L. 1985. “Quality Assurance Aspects of the International Joint Commission Great Lakes Monitoring Program”. In ASTM Special Technical Publication 867 Boulder, Colorado a symposium on Quality Assurance of Environmental Measurements, Aug. 8–12, 1983 |
