L’article “SLRS-5 elemental concentrations of thirty-three uncertified elements deduced from SLRS-5/SLRS-4 ratios” par A. Heimburger (Alexie.Heimburger@lisa.u-pec.fr), M. Tharaud, F. Monna, R. Losno, K. Desboeufs, E. Bon Nguyen, publiée à Geostandards and Geoanalytical Research, vol 35, pp 77-85 [pdf].
Le standard d’eau de rivière SLRS-5 (NRC-CNRC) est couramment utilisé pour contrôler la qualité des mesures des éléments majeurs et des éléments traces. Les concentrations de silicium et de trente-et-un éléments traces non certifiés ont été publiées pour le standard SLRS-4, mais pas encore pour le SLRS-5. Dans cette étude, des rapports SLRS-5/SLRS-4 ont été calculés à partir de mesures de SLRS-5 et de SLRS-4, effectuées par ICP-AES et HR-ICP-MS pour les éléments certifiés et pour trente-cinq éléments non certifiés (terres rares, B, Bi, Br, Cs, Ga, Ge, Hf, Li, Nb, P, Pd, Rb, Rh, S, Sc, Si, Sn, Th, Ti, Tl, Y).
Abstract: The fifth version of natural river water certified reference material, SLRS-5 (National Research Council – Conseil National de Recherches Canada), is commonly used to control the quality of major and trace element measurements. Concentrations of silicon and thirty-one uncertified trace elements have been reported for the certified reference material SLRS-4, but they are not yet available for SLRS-5. Here, SLRS-5/SLRS-4 ratios were deduced from SLRS-5 and SLRS-4 measurements by Inductively Coupled Plasma – Atomic Emission Spectrometry and High Resolution – Inductively Coupled Plasma – Mass Spectrometry for certified elements and thirty-five uncertified elements (rare earth elements, B, Bi, Br, Cs, Ga, Ge, Hf, Li, Nb, P, Pd, Rb, Rh, S, Sc, Si, Sn, Th, Ti, Tl, Y). Both standards were measured directly one after the other, so that calculated elemental ratios would not be notably influenced either by calibration uncertainties or by eventual long-term instrumental drift. The computed ratios are in good agreement with those deduced from the certified values. We also report concentrations for thirty-three uncertified elements in SLRS-5 by combining the measured SLRS-5/SLRS-4 ratios and the published SLRS-4 values. The resulting new dataset provides target SLRS-5 values, which will be useful in quality control procedures.