Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/8678
Title: Spectrophotometric determination of chromium using saccharin
Authors: Cherian, Tom
Narayana, B
Keywords: Chromium determination
spectrophotometry
<i style="">p</i>-nitroaniline
sulphanilamide
saccharin
Issue Date: Sep-2005
Publisher: CSIR
Series/Report no.: G01J3/00
Abstract: A sensitive and selective spectrophotometric method for the indirect determination of trace amounts of chromium(VI) is described. Chromium(VI) oxidizes hydroxylamine in acetate buffer of pH 4.0 to nitrite, which then diazotizes <i style="">p</i>-nitroaniline or sulphanilamide to form diazonium salt. These diazonium salts are then coupled with saccharin in an alkaline medium, which gives azo dye with absorption maximum at 372 and 390 nm for <i style="">p</i>-nitroaniline and sulphanilamide, respectively. The method obeys Beer’s law in the concentration range of 1-16 <img src='/image/spc_char/micro.gif' border=0> gmL<sup>-1</sup> for chromium with <i style="">p</i>-nitroaniline-saccharin and 0.6-14 <img src='/image/spc_char/micro.gif' border=0>gmL<sup>-1</sup> of chromium with sulphanilamide-saccharin couples. The molar absorptivity, Sandell’s sensitivity of the systems with <i style="">p</i>-nitroaniline-saccharin and sulphanilamide-saccharin couples were found to be 5.41<img src='/image/spc_char/cross.gif' border=0>10<sup>4 </sup>Lmol<sup>-1</sup>cm<sup>-1</sup>, 1.93<img src='/image/spc_char/cross.gif' border=0>10<sup>-3 </sup><img src='/image/spc_char/micro.gif' border=0>gcm<sup>-2</sup> and 2.63<img src='/image/spc_char/cross.gif' border=0>10<sup>4 </sup>Lmol<sup>-1</sup>cm<sup>-1</sup>, 3.9<img src='/image/spc_char/cross.gif' border=0>10<sup>-3 </sup><img src='/image/spc_char/micro.gif' border=0>gcm<sup>-2</sup>, respectively. The optimum reaction conditions and other analytical parameters were evaluated. The effect of interfering ions on the determination was described. Chromium(III) can be determined after it is oxidized with bromine water in an alkaline medium to chromium(VI). The developed method has been successfully applied to the analysis of the chromium in alloy steel, pharmaceutical samples, natural water and soil samples.
Description: 596-600
URI: http://hdl.handle.net/123456789/8678
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.12(5) [September 2005]

Files in This Item:
File Description SizeFormat 
IJCT 12(5) 596-600.pdf52.87 kBAdobe PDFView/Open


Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.