GeoPT papers

Publications relevant to the GeoPT programme

Thompson M, Ellison, S L R and Wood R (2006). The International Harmonized Protocol for the proficiency testing of analytical chemistry laboratories (IUPAC Technical Report). Pure and Applied Chemistry, 78, 145-196, doi:10.1351/pac200678010145

Thompson M and Ellison, S L R (2006). Fitness for purpose – the integrating theme of the revised Harmonised Protocol for proficiency testing in analytical chemistry laboratories. Accreditation and Quality Assurance, 11, 373-378

Kuznetsova A I and Chumakova N L (2007). Determination of the “difficult” elements Ag, B, Ge, Mo, Sn, Tl and W in geochemical reference samples and silicate rocks of the GeoPT proficiency testing series by DC arc atomic emission spectrometry. Geostandards Newsletter, 26, 307-312, doi:10.1111/j.1751-908X.2002.tb00637.x

Thompson M (2010).  Scoring the sum of correlated results in analytical proficiency testing.  Analytical Methods, 2, 976-977

Kriete C (2011). An evaluation of the inter-method discrepancies in ferromanganese nodule proficiency test GeoPT 23A. Geostandards and Geoanalytical Research, 35, 319-340,

Potts P J, Webb P C and Thompson M (2013). An assessment of performance in the routine analysis of silicate rocks based on an analysis of data submitted to the GeoPT proficiency testing programme for geochemical laboratories (2001-2011). Geostandards and Geoanalytical Research, 37, 403-416, doi: 10.1111/j.1751-908X.2013.00216.x

Analytical Methods Committee (2015). Fitness for purpose: the key feature in analytical proficiency testing. Analytical Methods, 7, 7404-7405

Kane J S (2015). A review of the IAG GeoPT and certification programmes, their protocols, and the differences between the original and potential modifications to the certification protocol. Geostandards and Geoanalytical Research, 39, 419-432

Potts P J, Thompson M and Webb P C (2015). Bias in the determination of Zr, Y and rare earth element concentrations in selected silicate rocks by ICP-MS when using some routine acid dissolution procedures: evidence from the GeoPT proficiency testing programme. Geostandards and Geoanalytical Research, 39, 315-327, doi: 10.1111/j.1 751-908X.2014.00305.x

Potts P J, Thompson M and Webb P C (2015). The reliability of assigned values from the GeoPT proficiency testing programme from an evaluation of data for six test materials that have been characterised as certified reference materials. Geostandards and Geoanalytical Research, 39, 407-417, doi: 10.1111 /j.1751-908X.2015.00338.x

Thompson M (2015). Is your “homogeneity test” really useful? Analytical Methods, 7, 1627-1629

Thompson M, Webb P C and Potts P J (2015). The GeoPT proficiency testing scheme for laboratories routinely analysing silicate rocks: a review of the operating protocol and proposals for its modification. Geostandards and Geoanalytical Research, 39, 433-442, doi: 10.1111/j.1 751-908X.2014.00343.x

Analytical Methods Committee (2016). Z-scores and other scores in chemical proficiency testing – their meanings, and some common misconceptions. AMCTB No 74. Analytical Methods, 8, 5553-5555

Thompson M (2016). On matrix reference materials characterised by proficiency test. Analytical Methods, 8, 4908-4911

Thompson M (2017). On the role of the mode as a location parameter for the results of proficiency tests in chemical measurement. Analytical Methods, 9, 5534-5540

Potts P J and Webb P C (2018). An evaluation of methods for assessing the competence of laboratories based on performance in the GeoPT proficiency testing scheme. Geostandards and Geoanalytical Research, 43, 217-229, doi: 10.1111/ggr.12252

Thompson M (2018). A properly developed consensus from a proficiency test is, for all practical purposes, interchangeable with a certified value for a matrix reference material derived from an interlaboratory comparison. Geostandards and Geoanalytical Research, 42, 91-96, doi: 10.1111/ggr.12195

Thompson M, Webb P C, Potts P J and Wilson S (2018). The stability of 57 consensus values in a proficiency test material re-issued blind after an interval of 18 years. Analytical Methods, 10, 1547.

Potts P J, Webb P C and Thompson M (2019). The GeoPT proficiency testing programme as a scheme for the certification of geological reference materials. Geostandards and Geoanalytical Research, 43, 409-418, doi: 10.1111/ggr.12261

Webb P C, Potts P J, Thompson M, Wilson S A and Gowing C J B (2019). The long-term robustness and stability of consensus values as composition location estimators for a typical geochemical test material in the GeoPT proficiency testing programme. Geostandards and Geoanalytical Research, 43, 397-408, doi: 10.1111/gg r.12263

Mansur E T, Barnes S-J, Savard D and Webb P C (2020). Determination of Te, As, Bi, Sb and Se (TABS) in geological reference materials and GeoPT proficiency test materials by hydride generation-atomic fluorescence spectrometry (HG-AFS). Geostandards and Geoanalytical Research, 44, 147-167, doi: 10.1 111/ggr.12289

Wilson S A, Potts P J and Webb P C (2020). Three new geochemical reference materials for mineral exploration and environmental contamination studies: SdAR-L2, SdAR-M2 and SdAR-H1, doi: 10.1111/ggr.12300