A new system for the spectrophotometric determination of arsenic in environmental and biological samples

Citation
A. Pillai et al., A new system for the spectrophotometric determination of arsenic in environmental and biological samples, ANALYT CHIM, 408(1-2), 2000, pp. 111-115
Citations number
24
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
ANALYTICA CHIMICA ACTA
ISSN journal
00032670 → ACNP
Volume
408
Issue
1-2
Year of publication
2000
Pages
111 - 115
Database
ISI
SICI code
0003-2670(20000309)408:1-2<111:ANSFTS>2.0.ZU;2-X
Abstract
A new sensitive method is proposed for the determination of traces of arsen ic(III). The method involves bleaching of the pinkish red colored dye, Rhod amine-B, by the action of iodine which is released by the reaction between potassium iodate and arsenic in slightly acidic medium. The color of the dy e was measured at 553 nm. Beer's law is obeyed in the concentration range o f 0.04-0.4 mg l(-1) of arsenic. The molar absorptivity was found to be 3.24 x 10(5) l mol(-1) cm(-1). The proposed method has been successfully applie d for the determination of arsenic in various environmental and biological samples. (C) 2000 Elsevier Science B.V. All rights reserved.