A sensitive colorimetric method for the determination of arsenic in environmental and biological samples

Citation
O. Agrawal et al., A sensitive colorimetric method for the determination of arsenic in environmental and biological samples, J CHIN CHEM, 46(4), 1999, pp. 641-645
Citations number
19
Categorie Soggetti
Chemistry
Journal title
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
ISSN journal
00094536 → ACNP
Volume
46
Issue
4
Year of publication
1999
Pages
641 - 645
Database
ISI
SICI code
0009-4536(199908)46:4<641:ASCMFT>2.0.ZU;2-A
Abstract
Results of a thorough study and application of leucocrystal violet for the determination of arsenic in parts per million (ppm) levels in environmental and biological samples is described here. The proposed method is based on the reaction of arsenic with potassium iodate to liberate iodine. The liber ated iodine selectively oxidises leucocrystal violet to form crystal violet dye in the presence of sodium hydroxide. The dye formed shows maximum abso rbance at 592 nm. The detection limit of arsenic is 0.002 mu gmL(-1) and th e method obeys Beer's law over the concentration range of 0.1 mu g - 1.0 mu g of per 25 mL of final solution (0.004 - 0.04 ppm). The molar absorptivit y was found to be 1.49 x 10(6) L mol(-1) cm(-1). The proposed method was su ccessfully applied for the determination of arsenic in various environmenta l and biological samples. The results are in good agreement with the standa rd reported method.