ISO/TS 20612:2007
Water quality -- Interlaboratory comparisons for proficiency testing of analytical chemistry laboratories
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ISO/TS 20612:2007 may be used if the determinands in the interlaboratory test may be regarded as capable of measurement with a certain degree of continuity. This is generally the case for chemical constituents and physicochemical determinands, but continuity does not always exist in the case of biological and/or microbiological determinands.