Determination of lithium contents in silicates by isotope dilution ICP-AAS and its evaluation by isotope dilution thermal ionisation mass spectrometry

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Abstract

A precise and simple method for the determination of lithium concentrations in small amounts of silicate sample was developed by applying isotope dilution-inductively coupled plasma-mass spectrometry (ID-ICP-MS). Samples plus a Li spike were digested with HF-HClO4, dried and diluted with HNO3, and measured by ICP-MS. No matrix effects were observed for 7Li/6Li in rock solutions with a dilution factor (DF) of ≥ 97 at an ICP power of 1.7 kW. By this method, the determination of 0.5 μg g-1 Li in a silicate sample of 1 mg can be made with a blank correction of <1%. Lithium contents of ultrabasic to acidic silicate reference materials (JP-1, JB-2, JB-3, JA-1, JA-2, JA-3, JR-1 and JR-2 from the Geological Survey of Japan, and PCC-1 from the US Geological Survey) and chondrites (three different Allende and one Murchison sample) of 8 to 81 mg were determined. The relative standard deviation (RSD) was typically <1.7%. Lithium contents of these samples were further determined by isotope dilution-thermal ionisation mass spectrometry (ID-TIMS). The relative differences between ID-ICP-MS and ID-TIMS were typically <2%, indicating the high accuracy of ID-ICP-MS developed in this study.

Original languageEnglish
Pages (from-to)371-382
Number of pages12
JournalGeostandards and Geoanalytical Research
Volume28
Issue number3
Publication statusPublished - 2004

Fingerprint

Silicates
lithium
Lithium
Isotopes
Dilution
Ionization
Mass spectrometry
dilution
ionization
silicate
mass spectrometry
isotope
Inductively coupled plasma mass spectrometry
Geological surveys
plasma
geological survey
chondrite
Hot Temperature
evaluation
Rocks

Keywords

  • Isotope dilution-ICP-MS
  • Lithium
  • Meteorites
  • Silicate reference materials
  • TIMS

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology

Cite this

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title = "Determination of lithium contents in silicates by isotope dilution ICP-AAS and its evaluation by isotope dilution thermal ionisation mass spectrometry",
abstract = "A precise and simple method for the determination of lithium concentrations in small amounts of silicate sample was developed by applying isotope dilution-inductively coupled plasma-mass spectrometry (ID-ICP-MS). Samples plus a Li spike were digested with HF-HClO4, dried and diluted with HNO3, and measured by ICP-MS. No matrix effects were observed for 7Li/6Li in rock solutions with a dilution factor (DF) of ≥ 97 at an ICP power of 1.7 kW. By this method, the determination of 0.5 μg g-1 Li in a silicate sample of 1 mg can be made with a blank correction of <1{\%}. Lithium contents of ultrabasic to acidic silicate reference materials (JP-1, JB-2, JB-3, JA-1, JA-2, JA-3, JR-1 and JR-2 from the Geological Survey of Japan, and PCC-1 from the US Geological Survey) and chondrites (three different Allende and one Murchison sample) of 8 to 81 mg were determined. The relative standard deviation (RSD) was typically <1.7{\%}. Lithium contents of these samples were further determined by isotope dilution-thermal ionisation mass spectrometry (ID-TIMS). The relative differences between ID-ICP-MS and ID-TIMS were typically <2{\%}, indicating the high accuracy of ID-ICP-MS developed in this study.",
keywords = "Isotope dilution-ICP-MS, Lithium, Meteorites, Silicate reference materials, TIMS",
author = "Takuya Moriguti and Akio Makishima and Eizou Nakamura",
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T1 - Determination of lithium contents in silicates by isotope dilution ICP-AAS and its evaluation by isotope dilution thermal ionisation mass spectrometry

AU - Moriguti, Takuya

AU - Makishima, Akio

AU - Nakamura, Eizou

PY - 2004

Y1 - 2004

N2 - A precise and simple method for the determination of lithium concentrations in small amounts of silicate sample was developed by applying isotope dilution-inductively coupled plasma-mass spectrometry (ID-ICP-MS). Samples plus a Li spike were digested with HF-HClO4, dried and diluted with HNO3, and measured by ICP-MS. No matrix effects were observed for 7Li/6Li in rock solutions with a dilution factor (DF) of ≥ 97 at an ICP power of 1.7 kW. By this method, the determination of 0.5 μg g-1 Li in a silicate sample of 1 mg can be made with a blank correction of <1%. Lithium contents of ultrabasic to acidic silicate reference materials (JP-1, JB-2, JB-3, JA-1, JA-2, JA-3, JR-1 and JR-2 from the Geological Survey of Japan, and PCC-1 from the US Geological Survey) and chondrites (three different Allende and one Murchison sample) of 8 to 81 mg were determined. The relative standard deviation (RSD) was typically <1.7%. Lithium contents of these samples were further determined by isotope dilution-thermal ionisation mass spectrometry (ID-TIMS). The relative differences between ID-ICP-MS and ID-TIMS were typically <2%, indicating the high accuracy of ID-ICP-MS developed in this study.

AB - A precise and simple method for the determination of lithium concentrations in small amounts of silicate sample was developed by applying isotope dilution-inductively coupled plasma-mass spectrometry (ID-ICP-MS). Samples plus a Li spike were digested with HF-HClO4, dried and diluted with HNO3, and measured by ICP-MS. No matrix effects were observed for 7Li/6Li in rock solutions with a dilution factor (DF) of ≥ 97 at an ICP power of 1.7 kW. By this method, the determination of 0.5 μg g-1 Li in a silicate sample of 1 mg can be made with a blank correction of <1%. Lithium contents of ultrabasic to acidic silicate reference materials (JP-1, JB-2, JB-3, JA-1, JA-2, JA-3, JR-1 and JR-2 from the Geological Survey of Japan, and PCC-1 from the US Geological Survey) and chondrites (three different Allende and one Murchison sample) of 8 to 81 mg were determined. The relative standard deviation (RSD) was typically <1.7%. Lithium contents of these samples were further determined by isotope dilution-thermal ionisation mass spectrometry (ID-TIMS). The relative differences between ID-ICP-MS and ID-TIMS were typically <2%, indicating the high accuracy of ID-ICP-MS developed in this study.

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