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: Industrial -> ash

Citations 2

"Preconcentration Of Iron(III), Cobalt(II) And Copper(II) Nitroso-R Complexes On Tetradecyldimethylbenzylammonium Iodide-naphthalene Adsorbent"
Talanta 1995 Volume 42, Issue 3 Pages 337-344
Bal K. Puri and Sanjay Balani

Abstract: Iron, cobalt and copper form colored water soluble anionic complexes with disodium 1-nitroso-2-naphthol-3-6-disulphonate (nitroso R-salt). The anionic complex is retained quantitatively as a water insoluble neutral ion associated complex (M-nitroso R-TDBA) on tetradecyldimethylbenzylammonium iodide on naphthalene (TDBA+I--naphthalene) packed column in the pH range of: Fe(III): 3.1-6.5, Co: 3.4-8.5 and Cu 5.9-8.0 when their solutions are passed individually over this adsorbent at a flow rate of 0.5-5.0 ml/min. The solid mass consisting of an ion associated metal complex along with naphthalene is dissolved out of the column with 5 mL dimethylformamide/chloroform and metals are determined spectrophotometrically. The absorbance is measured at 710 nm for iron, 425 nm for cobalt and 480 nm for copper. Beers law is obeyed in the concentration range 9.2-82 µg of iron, 425 nm for cobalt cobalt and 3.0-62 µg of copper in 5 mL of final DMF/CHCl3 solution. The molar absorptivities are calculated to be Fe: 7.58 x 10^3, Co: 1.33 x 10^4 and Cu: 4.92 x 10^4 M 1 cm-1. Ten replicate determinations containing 25 µg of iron, 9.96 µg of cobalt and 3.17 µg of copper gave mean absorbances 0.677, 0.450 and 0.490 with relative standard deviations of 0.88, 0.98 and 0.92%, respectively. The interference of large number of metals and anions on the estimations of these metals has been studied. The optimized conditions so developed have been employed for the trace determination of these metals in standard alloys, waste water and fly ash samples.
Cobalt(II) Copper(II) Iron(III) Spectrophotometry Preconcentration

"Advances In Analytical Methods Based On Atomic Absorption Spectrometry In The Geochemistry Laboratories Of The Geological Survey Of Canada"
Pap. Geol. Surv. Can. 1987 Volume 87, Issue 1a Pages 477-484
Hall, G E M; De Silva, K N; Pelchat, J C; Vaive, J E

Abstract: Three aspects are considered, viz, (i) development of a method to determine Tl, Ga and In by graphite-furnace AAS at or below their natural crustal abundance in rocks, (ii) determination of Ag, Au, Pd, Pt and Rh in biogeochemical samples and their ash at 2 to 10 ppb level, and (iii) more generally, the improvement of productivity and decrease of reagent consumption by the introduction of flow injection systems of sample preparation, introduction and manipulation.
Thallium Gallium Indium Silver Gold Palladium Platinum Rhodium Spectrophotometry Reagent consumption Sample pretreatment