Ringonderzoeken: het aanbod is groot. Hoe kiest u?

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1 Ringonderzoeken: het aanbod is groot. Hoe kiest u? Michel van Son NMi VSL Eurachem symposium Afrekenen op ringonderzoeken, 11 november 2004

2 Nederlands Meetinstituut Van Swinden Laboratorium Beheer en ontwikkeling nationale meetstandaarden, kalibraties, consultancy: massa, kracht en druk, lengte en volume, elektromagnetisme, tijd, temperatuur, ioniserende en niet-ioniserende straling, radiometrie en licht, en chemische metingen. NEN-EN-ISO/IEC accreditatie Sectie Chemie Referentiematerialen, certificering en kalibraties: gasmengsels, dampen, elektrolytische geleidbaarheid, metaalgehaltes Consultancy op het gebied van chemische metingen (meetonzekerheid) Organisatie ringonderzoeken 2

3 Inhoud Wat is beschikbaar? 3 Wat is een geschikt ringonderzoek? Welk beschikbaar ringonderzoek is geschikt?

4 Wat is beschikbaar? (1) Collega laboratoria Accreditatie organisaties Organisators van PTS 4 Tijdschriften (Aqual,.) Zoektocht op het WWW: proficiency test, interlaboratory comparison, laboratory evaluation study, round robin, cross check program, correlation program, co-operative trial, cross reference service, Ringversuch, ringonderzoek,

5 Wat is beschikbaar? (2) Overzichten op het WWW Asian Pacific Laboratory Accreditation Cooperation (APLAC) Proficiency Directory ~60 organisators 5 South African National Accreditation System (SANAS) Proficiency Testing Register ~350 schema s European Proficiency Testing Information System (EPTIS) ~800 schema s

Directory www.aplac.org/documents/documents.

6 Wat is een geschikt ringonderzoek? Relevantie Zijn er wezenlijke verschillen met de eigen praktijk? 6 Kwaliteit Zijn de resultaten goed bruikbaar voor de beoordeling van de kwaliteit van het lab?

7 Relevantie ringonderzoek Checklist: Analyse Proficiency test Spoorelementen in voedingsmiddelen Trace Element (BIPEA, Frankrijk) Situatie in lab Situatie in PT Acceptabel verschil? Frequent bepaalde bestanddelen: As, Cd, Cr, Cu, Hg, Pb, Se, Zn Frequent geanalyseerde monsters: rijstmeel, sojameel Methodes toegepast: ICP-MS na zure ontsluiting Type laboratorium: Producent van voedingsmiddelen Bestanddelen: Al, As, Cd, Co, Cr, Cu, Hg, Mo, Ni, Pb, Zn Type monster: meel Voorgeschreven methode: Geen Type deelnemers: Open voor ieder lab Ja/Nee Ja/Nee Ja/Nee Ja/Nee.:.: Ja/Nee 7 Slot conclusie: PT relevant? Ja/Nee

Frequent bepaalde bestanddelen: As, Cd, Cr, Cu, Hg, Pb, Se, Zn Frequent geanalyseerde monsters: rijstmeel, sojameel Methodes toegepast: ICP-MS na zure

8 Kwaliteit ringonderzoek (1) Doelen van het laboratorium Demonstratie competentie Monitoren kwaliteit (verbeteringen, vaststellen trends) Het laboratorium rekent op 8 Onafhankelijke en eerlijke evaluatie Technische en statistische competentie van organisator Goede kwaliteit test items (homogeniteit en stabiliteit) Nauwkeurige data invoer en -evaluatie Geheimhouding Adequate correspondentie

eerlijke evaluatie Technische en statistische competentie van organisator Goede kwaliteit test

9 Kwaliteit ringonderzoek (2) ISO Guide 43-1:1997 Definieert proficiency testing Basisdocument voor het ontwerpen van ringonderzoeken 9 ILAC G13 (2000) Criteria voor de competentie van PT organisatoren Gebaseerd op ISO/IEC 17025:1999 ISO Guide 43

ringonderzoeken 9 ILAC G13 (2000) Criteria voor de

10 Beschikbaar ringonderzoek geschikt? Accreditatie Informatie bij collega laboratoria Documentatie opvragen bij organisator EPTIS database 10

11 EPTIS database (1) 11

12 EPTIS database (2) 12

13 EPTIS database (3) Summary for the PTS "VIO XX-01 and VIO XX-18 (heavy) metals in drinking water" Sets of products Testing fields Food and drink Water Analytical chemistry Test item Tested property Testing method Drinking water Arsenic Drinking water Boron Drinking water Cadmium Drinking water Nickel Drinking water Lead Drinking water Copper Drinking water Zinc Drinking water Aluminium Drinking water Barium Drinking water Antimony Drinking water Selenium Drinking water Mercury Drinking water Manganese Drinking water Iron Drinking water Chromium 13

Cadmium Drinking water Nickel Drinking water Lead Drinking water Copper Drinking water Zinc Drinking water Aluminium Drinking water Barium

14 EPTIS database (4) Relation of the PTS to specific standards, guidelines,... Subsidiary aims of the PTS Independent Review Year of first execution Performed regularly yes -- If regular, frequency of performance twice per year (total) -- If not regular, year of last execution If not regular, will further PTS be performed on request Liable to pay the costs Participation fees yes On request Commissioned by This EPTIS database entry was entered / updated at 17-DEZ-03 Address of the provider of the PTS KIWA Water Research P.O. Box1072 NL-3430 BB Nieuwegein Telephone-No.: Telefax-No.: WWW-Address: Contact person Marieke ten Broeke Marieke.ten.broeke@kiwa.nl

year of last execution 14 -- If not regular, will further PTS be performed on request Liable to pay the costs Participation fees yes On request Commissioned by This EPTIS database

15 EPTIS database (5) Conditions for participation [Top] Participants are: International Number of participants: 13 Conditions for participation: Open participation for any laboratory. Voluntary participation for all laboratories. Documentation and Quality Management system [Top] 15 Quality Management system: The QMS for the operation of the proficiency testing scheme is based on ISO/IEC Guide 43 Quality Manual and / or Standard operating procedures (SOP), working instructions for the operation of the PT scheme: Information material or others: Advisory / steering group: Complaints: Confidentiality about results of participants: A complete description of the operation of the proficiency testing schemes is available. Written information material describing the proficiency testing scheme, its aim and operation are available for interested parties. An advisory/steering group is involved in matters concerning the supervision and operation of the proficiency testing scheme. A documented procedure for the handling of complaints is available. Is guaranteed

Documentation and Quality Management system [Top] 15 Quality Management system: The QMS for the operation of the proficiency testing scheme is based on ISO/IEC Guide 43 Quality Manual and / or

16 EPTIS database (6) Characterisation of test item(s) [Top] Producer of test item(s): Determination of the assigned Value: Uncertainty of result: Test item management: Stability of test items: Homogeneity of test items: Means of distribution of test items: Specific requirements on packaging, dispatch and storage: Spare test items during PT scheme round: Availability of test items after completion of the PT-scheme: By the preparation process of the test items (e.g. weighing value,...). The different participants simultaneously receive test items, which are similar as far as possible. Guaranteed on the basis of knowledge and experience. Homogeneity testing is carried out before the delivery of similar test items. Dispatching of the test items. No requirements necessary. Some test items are left at the provider until the end of the evaluation of the proficiency testing scheme. 16

completion of the PT-scheme: By the preparation process of the test items (e.g. weighing value,...). The different participants simultaneously receive test items, which are similar as far as possible.

17 EPTIS database (7) Evaluation of test results and assessment of the laboratories [Top] Statistical analysis of testing results: Handling of outliers: Performance assessment of laboratories: Criteria for evaluation of performance: Measures used for performance assessment: Performed according to a statistical procedure elaborated by the provider. During the evaluation of results the following statistical methods are used in order to minimise the influence of outliers: DIXON / VEGLIA The assessment of the laboratories is performed for each round of the proficiency testing scheme and based on the internal dispersion for the laboratories (precision). and based on the deviation from the assigned value (trueness). Z-scores are used as statistical criteria in the assessment of the laboratories. 17 Communication between provider and participants [Top] Instructions about PT-scheme: Reporting of test results and their format: Time scale for reporting of test results: Submission of PT-results by provider: Discussion forum: Assistance for performance improvement The participants receive instructions for the handling of the test items and, where necessary, for the performance of the test(s). According to the instructions of the provider. 2-4 WEEKS 2 week(s) after receipt of results, the provider publishes a report or information about the outcome of the proficiency testing scheme. A discussion forum between the provider and the participants takes place. The participants can ask the provider for technical instruction to help for the improvement of their performance.)

During the evaluation of results the following statistical methods are used in order to minimise the influence of outliers: DIXON / VEGLIA The assessment of the laboratories is performed for each

18 COEPT Verschillen in uitvoering and evaluatie -> Verschillen in resultaten? Comparability of the Operating and Evaluation Protocols of European Proficiency Testing Schemes in the Chemistry Sector Ringonderzoek van ringonderzoeken Water, voeding, milieu, arbeidshygiëne 18

Comparability of the Operating and Evaluation Protocols of European

19 Samenvattende conclusies Beschikbaarheid ringonderzoeken op vele manieren te achterhalen EPTIS database is daarbij een goed hulpmiddel 19 Ook bij het opstellen van een checklist van kwaliteitsaspecten

EPTIS database is daarbij een goed hulpmiddel 19

20 Eurachem Guide on Selection, Use and Interpretation of PT Schemes 20

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