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Determination of Ge, As, Se and Te in Silicate Samples Using Isotope Dilution‐Internal Standardisation Octopole Reaction Cell ICP‐QMS by Normal Sample Nebulisation
Author(s) -
Makishima Akio,
Nakamura Eizo
Publication year - 2009
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/j.1751-908x.2009.00014.x
Subject(s) - chemistry , silicate , isotope dilution , dilution , analytical chemistry (journal) , hydride , matrix (chemical analysis) , germanium , sample preparation , isotope , strontium , inductively coupled plasma mass spectrometry , radiochemistry , chromatography , metal , mass spectrometry , silicon , physics , organic chemistry , quantum mechanics , thermodynamics
A method for the determination of Ge, As, Se and Te in silicate samples using isotope dilution‐internal standardisation (ID‐IS) octopole reaction cell (ORC) ICP‐QMS by normal sample nebulisation was developed. The method does not involve either hydride generation or ion exchange. Germanium, Se and Te were determined by isotope dilution (ID), and As was determined by ID‐IS. A silicate sample with an added Ge‐Se‐Te spike was digested with an HF‐HNO 3 ‐HBr mixture, dried, re‐dissolved with HF and the supernatant liquid was directly aspirated into an ORC‐ICP‐QMS instrument with He or H 2 gas. No matrix effects were observed down to a dilution factor (DF) of ∼ 70 for Ge, Se and Te and DF of ∼ 1000 for As, which resulted in 3s detection limits in silicates of 2, 1, 0.1 and 4 ng g −1 , respectively. Advantages of the method are the simple sample introduction as well as a capability of determining S, Ti, Zr, Nb, Mo, Sn, Sb, Hf and Ta by ID‐IS‐ICP‐QMS/SFMS from the same solution. Furthermore, the total sample solution consumption was only 0.253 ml with DF = 2000. Therefore, only a 0.13 mg test portion was required. To demonstrate the applicability of this technique, Ge, As, Se and Te in eight silicate reference materials were determined, as well as S, Ti, Zr, Nb, Mo, Sn, Sb, Hf and Ta in four carbonaceous chondrites.