MEASUREMENT OF BISMUTH AT PG G(-1) CONCENTRATIONS IN SNOW AND ICE SAMPLES BY THERMAL IONIZATION MASS-SPECTROMETRY

Citation
W. Chisholm et al., MEASUREMENT OF BISMUTH AT PG G(-1) CONCENTRATIONS IN SNOW AND ICE SAMPLES BY THERMAL IONIZATION MASS-SPECTROMETRY, Analytica chimica acta, 347(3), 1997, pp. 351-358
Citations number
39
Categorie Soggetti
Chemistry Analytical
Journal title
ISSN journal
00032670
Volume
347
Issue
3
Year of publication
1997
Pages
351 - 358
Database
ISI
SICI code
0003-2670(1997)347:3<351:MOBAPG>2.0.ZU;2-Z
Abstract
A technique has been developed to measure bismuth in small volumes of snow and ice at pg g(-1) concentrations by thermal ionisation mass spe ctrometry (TIMS). The analysis of Greenland snow accumulated at Summit from 1967 to 1989 and 8 ky old ice has yielded values between 0.02-0. 9 pg g(-1). After normalising to aluminium concentrations, enhancement s in bismuth concentrations were found to correlate significantly with three volcanic events. These enhancements are consistent with high bi smuth concentrations observed in emissions from volcanoes. Compared wi th ancient ice recent bismuth concentrations are enhanced relative to aluminium implying either increased volcanic activity in the recent ti mes or, more likely, a contribution from anthropogenic sources.