Flow injection semi-online sorbent extraction preconcentration for graphite furnace atomic absorption spectrometry

Citation
Qh. Jin et al., Flow injection semi-online sorbent extraction preconcentration for graphite furnace atomic absorption spectrometry, MICROCHEM J, 62(3), 1999, pp. 316-327
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
MICROCHEMICAL JOURNAL
ISSN journal
0026-265X → ACNP
Volume
62
Issue
3
Year of publication
1999
Pages
316 - 327
Database
ISI
SICI code
0026-265X(199907)62:3<316:FISSEP>2.0.ZU;2-2
Abstract
A micro-flow injection sorbent extraction preconcentration system was combi ned with a graphite furnace atomic absorption spectrometer. The combination results in an integrated system for the determination of trace amounts of heavy metals. Silica bonded with octadecyl functional groups (C-18) was use d as a sorbent in a 15-mu L conical microcolumn. The metals to be determine d were preconcentrated as diethyl dithiocarbamate chelates onto the column for 60 s and then rinsed with deionized water and eluted with 40 mu L of et hanol. Compared with direct injection of 40 mu L of aqueous sample solution , enrichment factors of 30, 32, and 29 and detection limits (3 sigma) of 7. 8, 12.8, and 3.9 ng/L for cobalt, nickel, and lead, respectively, were obta ined with 60-s sample loading at 3.0 mL/min for sorbent extraction, 40 mu L of eluate injection, and peak area measurement. The results obtained for t race amounts of cobalt, nickel, and lead in reference materials showed that there were no significant differences between the certified and determined values. (C) 1999 Academic Press.