SPECTRUM, MULTIELEMENT SELECTIVITY AND ELEMENTAL RESPONSE OF A LINEAR SULFUR EMITTER IN FLAME PHOTOMETRY

被引:23
作者
AUE, WA
SUN, XY
机构
[1] Department of Chemistry, Dalhousie University, Halifax
来源
JOURNAL OF CHROMATOGRAPHY | 1993年 / 633卷 / 1-2期
关键词
D O I
10.1016/0021-9673(93)83149-M
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Although the luminescence from sulfur compounds in the flame photometric detector (FPD) is dominated by the S2 main-system bands (of about quadratic response), it contains as well a linear emitter whose ''Spectrum'' could be recorded in the 600 to 850 nm region. In this region sulfur chemiluminescence is a first-order process and varies, if at all, by a factor of less than two in elemental response (sulfur equivalency) among several structurally diverse compounds. The single-channel selectivity of linear sulfur against other FPD-active elements -B, C and H, Sn, Pb, N, P, As, Se, Cr, Mn, Fe, Ru and Os- was measured for a band at ca. 750 nm (as well as for a wider 600 to 850 nm range), and was compared with the selectivity of S2 for its commonly monitored band at 394 nm (as well as for the total 300-850 nm photomultiplier range). The IUPAC detection limit (S/sigma = 3) of linear sulfur is 2 . 10(-13) mol S/s and its linear range spans four orders of magnitude. Overall, the new linear mode seems preferable to the conventional quadratic one; and it appears competitive with other methodologies of organosulfur detection. A speculative discussion of inter-element selectivity, mainly as it relates to spectral features, is appended, at the reviewer's request.
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页码:151 / 162
页数:12
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