Required proficiency testing samples and frequency of analysis

Required proficiency testing samples and frequency of analysis. (1) Requirements. (a) A laboratory shall participate in at least one PT sample study per accreditation period as specified in sub. (2) , subject to all the following: 1. For aqueous and non-aqueous matrices, a laboratory shall analyze aqueous matrix PT samples for each combination of technology and analyte or analyte group in its fields of accreditation. 2. For the drinking water matrix, a laboratory shall analyze PT samples for each combination of method and analyte or analyte group in its fields of certification. Acceptance criteria for these samples are set in s. NR 149.27 . (b) PT samples may be those offered by approved PT sample providers at regular intervals, as “rapid response” PT samples, or as custom formulations approved by the department. (c) A laboratory shall report a proper method code, which matches the technology and analyte or analyte group for which accreditation is held, with results for PT samples. (2) Lists of required PT samples and approved PT sample providers. (a) The department shall seek the advice of the council prior to identifying required PT samples and approved PT sample providers. (b) The list shall identify matrix-specific PT samples required for submittal for renewal of accreditation or with initial or revised applications and the specific PT sample providers approved for supplying each required PT sample.