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    The fourth international and (Dutch) national trial with reference materials for water microbiology

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    Authors
    Mooijman KA
    Havelaar AH
    van Strijp-Lockefeer NGWM
    Heisterkamp SH
    Type
    Report
    Language
    en
    
    Metadata
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    Title
    The fourth international and (Dutch) national trial with reference materials for water microbiology
    Translated Title
    Het vierde internationale en (nederlandse) nationale ringonderzoek met referentiematieralen voor de watermicrobiologie
    Publiekssamenvatting
    A fourth trial with reference materials for water microbiology was organized. Forty-one Dutch laboratories and 37 laboratories of the EC participated. Each laboratory received four capsules of batches of reference materials with the test strains WR63 Enterococcus faecium and WR51 Staphylococcus warneri. Each capsule was reconstituted according to a standardized protocol and analysed by three different culturing methods: faecal streptococci by a reference method and by national standard methods (mf-techniques) and most probable number of faecal streptococci by national standard methods. The method of analysing the results was different from that in the three former trials. A method was used to exclude extreme observations in two steps. Next the repeatability (r) and reproducibility (R) were calculated. The calculated values of r and R were very low and those found for test strain WR63 almost impossible (theoretically) to improve. Differences found between methods could mostly be attributed to the medium used.<br>
    Publisher
    Rijksinstituut voor Volksgezondheid en Milieu RIVM
    Sponsors
    EG/BCR
    HIMH
    VHI
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