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The results of thirteenth international proficiency test (Geo PT 23) obtained at the geochemical laboratory of Geological Survey of India, Hyderabad are presented. Estimation of 34 trace elements including all the fourteen rare earths obtained by ICP-MS in Koln Loess sample (Loess- 1) is compared with the assigned values. Sample decomposition method and other relevant details of the analytical procedures adopted are presented. Depending up on the 'Z-scores' calculated, the fitness of the data for either "pure geochemistry" or "applied geochemistry" was assessed. An overview of 'Z- score' results indicates that all of the elements except barium of the data contributed from our laboratory fell with in the -2<2<2 range which included the majority of the trace and rare earth elements used normally in several pure geochemical investigations. The results have indicated that the data obtained at our laboratory is excellent and further allowed us to investigate the very minor analytical discrepancy observed in the barium data and optimize necessary aspects to rectify the bias.

Keywords

Koln Loess Sample, Analytical Geochemistry, ICPMS, Trace Elements, REE, "Z-Score", G.S.I.Labs, Hyderabad.

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