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G-Probe Round 24 – Deadline extended owing to circumstances associated with Covid-19

The Round 24 test material has beeen dispatched. Only one test material – a basanite glass has been supplied for this round. Distribution of the speleothem carbonate pressed nano-powder pellet will be deferred until the next round, in spring 2021.

The system is now ready to accept your data for the basanite, BKWE-1G. The deadline for submission has been extended to 15th January on account of deliveries having been delayed and the uncertainty associated with renewed lockdowns due to Covid-19.

Note that owing to the exceptional circumstances of the Covid-19 pandemic, there will be only one round this year.


The G-Probe report for round Round 23, involving the Norite glass test material NoSM-1G, is available for download.


For enquiries about:

The test material and the G-Probe programme, contact Dieter Garbe-Schönberg: dieter.garbe-schoenberg@ifg.uni-kiel.de​

The delivery of test materials, contact Charles Gowing: cjbg@bgs.ac.uk

The website and reporting results online, contact Peter Webb: gprobe.iag@gmail.com

Payments and subscriptions, contact Chris Jackson: iag-treasurer@virginmedia.com


The G-Probe proficiency testing programme is provided by the International Association of Geoanalysts (IAG): www.geoanalyst.org/

The IAG gratefully acknowledges the major role that Steve Wilson (USGS) has played in initiating, organising and developing the G-Probe programme over many years.

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