Determination of Lithium Contents in Silicates by Isotope Dilution ICP‐MS and its Evaluation by Isotope Dilution Thermal Ionisation Mass Spectrometry

Geostandards and Geoanalytical Research - Tập 28 Số 3 - Trang 371-382 - 2004
Takuya Moriguti1, Akio Makishima1, Eizo Nakamura1
1The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Study of the Earth’s Interior, Okayama University at Misasa, Tottori-ken 682-0193, Japan

Tóm tắt

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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Geostandards and Geoanalytical Research

Tập 28 Số 3

371-382

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