The GeoPT Proficiency Testing Programme as a Scheme for the Certification of Geological Reference Materials

• Published in: Geostandards and geoanalytical research Vol. 43; no. 3; pp. 409 - 418
• Main Authors: Potts, Philip J., Webb, Peter C., Thompson, Michael
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 01.09.2019
• Subjects: assigned values; Certification; certification protocol; certified value; GeoPT; ISO Guide 35; proficiency testing; Properties; Reference materials; Silicates; Statistical analysis; Statistical methods; Testing

ISO Guide 35:2017 provides, for the first time, an alternative way of characterising certified reference materials using proficiency testing. In this paper, the properties of assigned values derived from the well‐established GeoPT proficiency testing scheme are examined. This scheme, designed for la...