Reference Material

Qotho is ISO 17034 Accredited as a Certified Reference Material Producer.

The availability and use of matrix-matched reference materials provides a laboratory with a powerful tool to monitor its internal QA/QC performance, besides being a requirement of ISO 17025

Qotho has the capacity to prepare reference materials in batches from 20kg to 1000kg, depending on the client’s requirements and application. In addition, the remainder of the material that was prepared for any PT round may be purchased on an ad-hoc basis following certification, once the PT round is completed.

Depending on the urgency of the client, certification can be carried out as follows: 

  • By participating in one round or several rounds of the relevant PT scheme;
  • By utilising accredited and/or specialist commercial laboratories;
  • By employing a combination of the above. 

Whichever route is selected, the Qotho methodology for certification is based on the consensus value of the measurand, using a network of competent laboratories, and following a stringent and robust statistical evaluation protocol, as per the requirements of ISO 13528 

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