Certified materials

Samples from previous Proficiency tests are being sold as certified materials and can be used for method development or as reference samples for internal quality control. The samples are accompanied by a “Certificate of Analysis” providing information gathered from the results of the WEPAL-QUASIMEME PT schemes, such as:

  • the consensus value: the mean value of the dataset obtained from the PT, calculated with robust statistics
  • the standard deviation and coefficient of variation
  • number of results used to calculate the consensus value
  • median and MAD (Median of Absolute Deviation)
  • relative uncertainty and uncertainty of the consensus value

Please note that for the samples being find very stable (>10 years) the information on the certificate contain data from all PT-schemes the sample was used for and for the less stable samples contain only the most recent information.

Overview of the available reference materials and how to order in the WEPAL-QUASIMEME webshop.

Webshop

Fees depend on your choice. Participants of the WEPAL-QUASIMEME programmes are entitled to a discount.

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