TY - JOUR
T1 - Measurement of lithium isotopic ratios as lithium tetraborate ions
AU - Bickle, M. J.
AU - Chapman, H. J.
AU - You, C. F.
N1 - Funding Information:
We thank Chan (LSU) for provision of an aliquot of L-SVEC and SRM951 standards, the Cambridge firemen who confined the fire to one chemical laboratory, and the anonymous reviewer who pointed out numerous inaccuracies. This research was funded by the U.K. Natural Environment Research Council.
PY - 2000/10/16
Y1 - 2000/10/16
N2 - Determination of 6Li/7Li ratios using Li2BO2/+ ions analysed by thermal ionisation mass spectrometry with ion counting has been investigated by numerical simulation and experiment. It is possible to solve for one or more of the 6Li/7Li ratio, 10B/11B ratio and fractionation if one or more of the ratios of the 54, 55, 56, 57, 58 and 59 masses of Li2BO2/+ are measured. Monte Carlo simulation of data sets suggests that within-sample precision on measurement of Li2BO2/+ mass ratios is largely limited by counting statistics and should result in precision as good as 0.25‰ (1σ) on the 6Li/7Li ratio. However repeatability of 6Li/7Li and 10B/11B ratios gives precisions no better than approximately ±3‰ (1σ) and the probable cause is fractionation of the 6Li/7Li ratio on the filament due to the large Li+ ion beam produced during analysis of Li2BO2/+. Plots of variation of sample fractionation with time confirms that fractionation is primarily controlled by varying 6Li/7Li ratio rather than varying fractionation of Li2BO2/+ or 10B/11B ratio. (C) 2000 Elsevier Science B.V.
AB - Determination of 6Li/7Li ratios using Li2BO2/+ ions analysed by thermal ionisation mass spectrometry with ion counting has been investigated by numerical simulation and experiment. It is possible to solve for one or more of the 6Li/7Li ratio, 10B/11B ratio and fractionation if one or more of the ratios of the 54, 55, 56, 57, 58 and 59 masses of Li2BO2/+ are measured. Monte Carlo simulation of data sets suggests that within-sample precision on measurement of Li2BO2/+ mass ratios is largely limited by counting statistics and should result in precision as good as 0.25‰ (1σ) on the 6Li/7Li ratio. However repeatability of 6Li/7Li and 10B/11B ratios gives precisions no better than approximately ±3‰ (1σ) and the probable cause is fractionation of the 6Li/7Li ratio on the filament due to the large Li+ ion beam produced during analysis of Li2BO2/+. Plots of variation of sample fractionation with time confirms that fractionation is primarily controlled by varying 6Li/7Li ratio rather than varying fractionation of Li2BO2/+ or 10B/11B ratio. (C) 2000 Elsevier Science B.V.
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U2 - 10.1016/S1387-3806(00)00253-0
DO - 10.1016/S1387-3806(00)00253-0
M3 - Article
AN - SCOPUS:0034676055
SN - 1387-3806
VL - 202
SP - 273
EP - 282
JO - International Journal of Mass Spectrometry
JF - International Journal of Mass Spectrometry
IS - 1-3
ER -