ONLINE SULFUR-ISOTOPE DETERMINATION USING AN ELEMENTAL ANALYZER COUPLED TO A MASS-SPECTROMETER

Citation
A. Giesemann et al., ONLINE SULFUR-ISOTOPE DETERMINATION USING AN ELEMENTAL ANALYZER COUPLED TO A MASS-SPECTROMETER, Analytical chemistry, 66(18), 1994, pp. 2816-2819
Citations number
13
Categorie Soggetti
Chemistry Analytical
Journal title
ISSN journal
00032700
Volume
66
Issue
18
Year of publication
1994
Pages
2816 - 2819
Database
ISI
SICI code
0003-2700(1994)66:18<2816:OSDUAE>2.0.ZU;2-R
Abstract
An on-line method for S-isotope analysis is described. Samples are com busted in an elemental analyzer. SO2 is separated from other combustio n gases by gas chromatography, and the gases enter the ion source of t he mass spectrometer through a split interface. Integrated peak areas for (SO2+)-S-32 and (SO2+)-S-34 are compared to the response for a sta ndard gas sample to determine the delta(34)S value. delta(34)S values of samples analyzed using the on-line method correspond Linearly with those achieved from the same sample prepared off-line, where Kiba redu ction followed by oxidation of the sulfur to SO2 is carried out prior to S-isotope analysis against a known standard. With the described on- line method, the amount of sulfur necessary for S-isotope analysis is reduced to about 10 mu g of S per analysis. The time needed for on-lin e preparation and measurement is less than one-third of the off-line p rocedure.