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Title: Spectrophotometric determination of arsenic in environmental and biological samples
Authors: Narayana, B
Cherian, Tom
Mathew, Mendalin
Pasha, Chand
Keywords: Arsenic
Variamine blue
Issue Date: Jan-2006
Publisher: CSIR
Series/Report no.: Int. Cl.<sup>7</sup> G01J3/00
Abstract: A simple and sensitive spectrophotometric method has been developed for the determination of arsenic using variamine blue as a chromogenic reagent. The method is based on the reaction of arsenic(III) with potassium iodate in acid medium to liberate iodine, which oxidizes variamine blue to form a violet coloured species having an absorption maximum at 556 nm. Beer’s law is obeyed in the range 0.2-14 μg mL<sup>-1</sup> of As(III). The molar absorptivity, Sandell’s sensitivity, detection limit and quantitation limit were found to be 1.43<img src='/image/spc_char/cross.gif' border=0>10<sup>4</sup> L mol<sup>-1</sup>cm<sup>-1</sup>, 5.26<img src='/image/spc_char/cross.gif' border=0>10<sup>-2</sup> μg cm<sup>-2</sup>, 0.022 and 0.072 μg mL<sup>-1</sup>, respectively. The optimum reaction conditions and other analytical parameters were evaluated. The proposed method has been successfully applied for the determination of arsenic in various environmental and biological samples.
Description: 36-40
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.13(1) [January 2006]

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