University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Plant -> tobacco

Citations 2

"Flow Injection Preconcentration Of Cobalt(II) On 1-nitroso-2-naphthol-3,6-disulfonate-modified Alumina For Flame Atomic Absorption Spectrometry"
Anal. Chim. Acta 1994 Volume 287, Issue 3 Pages 247-252
Marek Trojanowicz* and Krystyna Pyrzyska

Abstract: A solution of 5 mM disodium 1-nitroso-2-naphthol-3,6-disulfonate was pumped (3 ml/min) through a column (5 cm x 2.5 mm i.d.) of alumina (surface area 186 m2/g, average pore diameter 41 .angstrom.) to modify its surface. Samples were injected into a carrier stream of water which passed through the column for a pre-set time (typically 20 min) and flow rate (2.4-6 ml/min). The adsorbed Co(II) was eluted with 0.2 mL of 0.1 M NaOH at 2.7 ml/min and detected by AAS at 240.7 nm using an air/acetylene flame. For a flow rate of 2.4 ml/min and a 20 min pre-concentration time, the calibration graph was linear for up to 20 µg/l of Co(II), the detection limit was 0.44 µg/l and the RSD (n = 6) for 10 µg/l of Co(II) was 2.3%. Fe(III), Cu(II), Ni(II) and other metal ions did not interfere. The method was applied to oriental tobacco leaf reference material and the results agreed well with the certified values. The recovery of 1 µg/l of Co(II) from spiked artificial ocean water was 97% with a RSD of 3.3%.
Cobalt(II) Spectrophotometry Interferences Reference material Preconcentration

"Automated Tobacco Analysis By Means Of Flow Injection Analysis"
Beitr. Tabakforsch. Int. 1988 Volume 14, Issue 2 Pages 105-118
Finster P, Hollweg J, Kausch E, Burmester U

Abstract: The construction and mode of operation are described of a simple modular instrument for flow injection analysis. The instrument, which is suitable for multi-component analysis of small series of samples, was applied in determination of nicotine, NO3-, Cl-, NH4+ and PO43- in tobacco. Stopped-flow conditions permitted removal of background absorbance originating from the sample matrix.
Nicotine Nitrate Chloride Ammonium Phosphate Sample preparation Extraction Automation Dialysis Gas diffusion Stopped-flow