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An Investigation of the Reliability of HF Acid Mixtures in the Bomb Digestion of Silicate Rocks for the Determination of Trace Elements by ICP ‐ MS
Author(s) -
Okina Olga,
Lyapunov Sergey,
Avdosyeva Mariya,
Ermolaev Boris,
Golubchikov Vladimir,
Gorbunov Anatoly,
Sheshukov Victor
Publication year - 2016
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12124
Subject(s) - chemistry , rhyolite , biotite , silicate , trachyte , inductively coupled plasma mass spectrometry , trace element , nitric acid , digestion (alchemy) , mineralogy , nuclear chemistry , analytical chemistry (journal) , geology , quartz , volcanic rock , chromatography , mass spectrometry , geochemistry , inorganic chemistry , volcano , paleontology , organic chemistry
The influence of the mixtures HF ‐ HNO 3 and HF ‐ NH 4 F‐ HNO 3 in bomb digestion for trace element determination from different rock types was studied using ICP ‐ MS . It is shown that the HF concentration, not the ratio of reagents in the decomposing mixture, controls the digestion process of a rock. Data for Zr in the granite G‐2 as a function of HF concentration gave the same results as reaction mixtures of various compositions. A complete digestion in 50‐mg sample bombs was achieved by 1.0 ml of HF alone, or with a mixture of other acids at a HF concentration of at least 35% m/m at 196 °C over 18 h. The results of the analysis of basalts BCR ‐1, BIR ‐1, mica schist SDC ‐1, shale SBC ‐1, granites G‐2, SG ‐1A, garnet‐biotite plagiogneiss GBP g‐1, rhyolite RGM ‐1, granodiorite GSP ‐1, trachyandesite MTA ‐1 and rhyolite MR h‐1 are given and compared against available data. The reproducibility of the element determinations by ICP ‐ MS and XRF as an independent non‐destructive analysis for a quality check in the range of concentrations typical for routine rock samples is given.