Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Peter C. Webb"'
Publikováno v:
Geostandards and Geoanalytical Research. 46:223-243
Data submitted over the past 25 years to GeoPT, the highly successful proficiency-testing programme for the geochemical analysis of geological materials, organized by the International Association of Geoanalysts, provides a valuable resource that per
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0acefbc6e941e76b8b2d416feddf9b50
https://doi.org/10.1111/ggr.12424
https://doi.org/10.1111/ggr.12424
The preparation and certification of three new sediment‐based reference materials SdAR‐L2 (Blended sediment), SdAR‐M2 (Metal‐rich sediment) and SdAR‐H1 (Metalliferous sediment) described in this paper involved collaboration between the U.S.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0302b9326fb26b012924f31eeaeb19d9
http://oro.open.ac.uk/67394/1/Wilson_et_al-2019-Geostandards_and_Geoanalytical_Research.pdf
http://oro.open.ac.uk/67394/1/Wilson_et_al-2019-Geostandards_and_Geoanalytical_Research.pdf
Publikováno v:
Geostandards and Geoanalytical Research. 44:147-167
The study of Te, As, Bi, Sb and Se (TABS) has increased over the past years due to their use in the development of low‐carbon energy technologies. However, there is a scarcity of mass fraction values of TABS in geological reference materials. This
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1188d9c493799d34b7b1934ea5e5f23b
https://doi.org/10.1111/ggr.12289
https://doi.org/10.1111/ggr.12289
Publikováno v:
Geostandards and Geoanalytical Research. 43:397-408
Re-issuing the same test material, its true identity unknown to participants, in two rounds of the GeoPT proficiency testing programme 18 years apart has demonstrated remarkable similarity, and therefore stability, of consensus values independently e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::65dffd1e3df54d6ac0be9d11ecc89ad9
https://doi.org/10.1111/ggr.12263
https://doi.org/10.1111/ggr.12263
Publikováno v:
Geostandards and Geoanalytical Research. 43:409-418
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bccb3d844933ba4cb38430fd272ea270
https://doi.org/10.1111/ggr.12261
https://doi.org/10.1111/ggr.12261
Autor:
Philip J. Potts, Peter C. Webb
Publikováno v:
Geostandards and Geoanalytical Research. 43:217-229
The original certification protocol, published by the International Association of Geoanalysts in 2003, specified that the competence of laboratories selected as competent to contribute certification measurements should be evaluated from their perfor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::326172e6a18ebec5e5cf12630c0803e2
https://doi.org/10.1111/ggr.12252
https://doi.org/10.1111/ggr.12252
Publikováno v:
Analytical Methods. 10:1547-1551
In 2017 a silicate rock test material was re-issued in the geoanalytical proficiency test GeoPT after an interval of 18 years. The second distribution was participant-blind. Consensus values (for each analyte for which measurements were submitted by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee1826e489bd44671595e1323709fd65
https://doi.org/10.1039/c8ay00093j
https://doi.org/10.1039/c8ay00093j
Autor:
Peter C. Webb, Geoffrey Lyons
Publikováno v:
The Management of Educational Institutions ISBN: 9781351041140
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::16fadf7a6814a36f1a1c1938537b3119
https://doi.org/10.4324/9781351041140-6
https://doi.org/10.4324/9781351041140-6
Publikováno v:
Geostandards and Geoanalytical Research. 39:407-417
Assigned values derived from the GeoPT proficiency testing programme were compared with certified values for six certified reference materials that have been used as test materials in the GeoPT programme. Statistical analysis showed that there were f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a19e7ffda616f49766cc88de60806718
https://doi.org/10.1111/j.1751-908x.2015.00338.x
https://doi.org/10.1111/j.1751-908x.2015.00338.x
Publikováno v:
Geostandards and Geoanalytical Research. 39:315-327
The analytical results for the modified river sediment, SdAR-1 circulated in Round 31 of the GeoPT proficiency testing programme, revealed unexpected discrepancies for Zr, Y and most higher atomic number rare earth elements, in determinations made by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3aef2d0d244659face6d93fee9e1d4ae
https://doi.org/10.1111/j.1751-908x.2014.00305.x
https://doi.org/10.1111/j.1751-908x.2014.00305.x