Precise determination of lithium isotopic composition in low concentration natural samples

Chen-Feng You, Lui Heung Chan

Research output: Contribution to journalLetter

98 Citations (Scopus)

Abstract

An improved procedure for lithium isotope analysis using Li3PO4 as the ion source has been investigated for application to geological samples. The 7Li/6Li ratio is measured using double rhenium filament thermal ionization mass spectrometry in which isotopic fractionation is minimized at high temperatures. The method produces a stable, high intensity Li+ ion beam that allows measurement of nanogram quantities of lithium. This results in a reduction in sample size of up to 1000 times relative to that required for the established Li2BO+ 2 method while maintaining a comparable precision of better than ∼1%o (1σ). Replicate analyses of the NBS L-SVEC Li2CO3 standard yielded a mean value of 12.1047 ± 0.0043 (n = 21), which is close to the reported absolute value of 12.02 ± 0.03. Intercalibration with a wide range of geological samples shows excellent agreement between the Li3PO4 and Li2BO+ 2 techniques. Replicate analyses of seawater and a fresh submarine basalt display high precision results that agree with previous measurements. Taking advantage of the high ionization efficiency of the phosphate ion source, we have made the first measurements of the lithium concentration (by isotope dilution) and isotopic composition of calcareous foraminiferal tests and other marine carbonates. Preliminary results indicate that substantial lithium exchange occurs between carbonate sediments and their interstitial waters. In addition, a possible link between lithium paleoceanography and paleoclimate during the last 1000 ky may be derived from planktonic foraminiferal tests. This highly sensitive technique can be applied in the examination of low lithium reservoirs and thereby provide insight into some fundamental aspects of lithium geochemistry.

Original languageEnglish
Pages (from-to)909-915
Number of pages7
JournalGeochimica et Cosmochimica Acta
Volume60
Issue number5
DOIs
Publication statusPublished - 1996 Jan 1

Fingerprint

lithium
Lithium
isotopic composition
Chemical analysis
Carbonates
Ion sources
Isotopes
Ionization
ion
ionization
isotope
Rhenium
rhenium
paleoceanography
Geochemistry
carbonate sediment
isotopic fractionation
Fractionation
Seawater
paleoclimate

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

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abstract = "An improved procedure for lithium isotope analysis using Li3PO4 as the ion source has been investigated for application to geological samples. The 7Li/6Li ratio is measured using double rhenium filament thermal ionization mass spectrometry in which isotopic fractionation is minimized at high temperatures. The method produces a stable, high intensity Li+ ion beam that allows measurement of nanogram quantities of lithium. This results in a reduction in sample size of up to 1000 times relative to that required for the established Li2BO+ 2 method while maintaining a comparable precision of better than ∼1{\%}o (1σ). Replicate analyses of the NBS L-SVEC Li2CO3 standard yielded a mean value of 12.1047 ± 0.0043 (n = 21), which is close to the reported absolute value of 12.02 ± 0.03. Intercalibration with a wide range of geological samples shows excellent agreement between the Li3PO4 and Li2BO+ 2 techniques. Replicate analyses of seawater and a fresh submarine basalt display high precision results that agree with previous measurements. Taking advantage of the high ionization efficiency of the phosphate ion source, we have made the first measurements of the lithium concentration (by isotope dilution) and isotopic composition of calcareous foraminiferal tests and other marine carbonates. Preliminary results indicate that substantial lithium exchange occurs between carbonate sediments and their interstitial waters. In addition, a possible link between lithium paleoceanography and paleoclimate during the last 1000 ky may be derived from planktonic foraminiferal tests. This highly sensitive technique can be applied in the examination of low lithium reservoirs and thereby provide insight into some fundamental aspects of lithium geochemistry.",
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Precise determination of lithium isotopic composition in low concentration natural samples. / You, Chen-Feng; Chan, Lui Heung.

In: Geochimica et Cosmochimica Acta, Vol. 60, No. 5, 01.01.1996, p. 909-915.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Precise determination of lithium isotopic composition in low concentration natural samples

AU - You, Chen-Feng

AU - Chan, Lui Heung

PY - 1996/1/1

Y1 - 1996/1/1

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AB - An improved procedure for lithium isotope analysis using Li3PO4 as the ion source has been investigated for application to geological samples. The 7Li/6Li ratio is measured using double rhenium filament thermal ionization mass spectrometry in which isotopic fractionation is minimized at high temperatures. The method produces a stable, high intensity Li+ ion beam that allows measurement of nanogram quantities of lithium. This results in a reduction in sample size of up to 1000 times relative to that required for the established Li2BO+ 2 method while maintaining a comparable precision of better than ∼1%o (1σ). Replicate analyses of the NBS L-SVEC Li2CO3 standard yielded a mean value of 12.1047 ± 0.0043 (n = 21), which is close to the reported absolute value of 12.02 ± 0.03. Intercalibration with a wide range of geological samples shows excellent agreement between the Li3PO4 and Li2BO+ 2 techniques. Replicate analyses of seawater and a fresh submarine basalt display high precision results that agree with previous measurements. Taking advantage of the high ionization efficiency of the phosphate ion source, we have made the first measurements of the lithium concentration (by isotope dilution) and isotopic composition of calcareous foraminiferal tests and other marine carbonates. Preliminary results indicate that substantial lithium exchange occurs between carbonate sediments and their interstitial waters. In addition, a possible link between lithium paleoceanography and paleoclimate during the last 1000 ky may be derived from planktonic foraminiferal tests. This highly sensitive technique can be applied in the examination of low lithium reservoirs and thereby provide insight into some fundamental aspects of lithium geochemistry.

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JO - Geochmica et Cosmochimica Acta

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