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: Geological -> ore -> zinc

Citations 1

"Simple Flow Injection Spectrofluorimetric Method For Speciation Of Thallium"
Analyst 1996 Volume 121, Issue 6 Pages 813-816
Tomás Pérez-Ruiz, Carmen Martínez-Lozano, Virginia Tomás and Rocio Casajús

Abstract: A flow injection method for determining Tl(I) and/or Tl(III) is described. For Tl(I) determination, the sample (200 µL) was injected into a carrier stream (0.5 ml/min) of 1 M HCl and merged with an aqueous stream (0.5 ml/min). The mixture was passed through a 30 cm reaction coil after which the fluorescence intensity was measured at 419 nm (excitation at 227 nm). For Tl(I) plus Tl(III) (i.e., total Tl) determination, the above procedure was repeated, except that the aqueous stream was replaced by a stream (0.5 ml/min) of 0.1 mM thiourea. Tl(III) in the sample was determined by difference. The calibration graphs were linear for 0.05-10 and for 0.1-10 µM Tl(I) and Tl(III), respectively. The RSD (n = 10) were 1%. The throughput was 90 samples/h. Recoveries of Tl(I) and Tl(II) from synthetic mixtures were 93%. The method was applied to soil and zinc ores.
Thallium(I) Thallium(III) Fluorescence Speciation