期刊
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
卷 21, 期 5, 页码 535-538出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b601039c
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A sequential/bead injection lab-on-valve apparatus incorporating a renewable microcolumn packed with co-polymeric immobilized C-18 microbeads was applied to the on-line co-precipitate separation/preconcentration of ultra-trace cadmium by hyphenating with hydride generation atomic fluorescence spectrometry. Cadmium was co-precipitated with lanthanum hydroxide and collected on a microcolumn in the lab-on-valve. The co-precipitate was eluted with hydrochloric acid and directed to meet tetrahydroborate and facilitate hydride generation. The hydride was separated from the reaction mixture and was swept into the atomizer. With a sampling volume of 500 mu l, quantitative retention of cadmium was achieved, along with an enrichment factor of 9.8 and a sampling frequency of 11 h(-1). A detection limit of 3.5 ng l(-1) was derived, along with a RSD of 1.6% (0.1 mu g l(-1)). The procedure was validated analyzing cadmium in certified reference materials.
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