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Title: Virtually specific UV-molecular probe for nitrite sensing
Authors: Dhanya, Santhakumar
Nair, Vineetha V P
Milja, Thazhathuparambil E
Ramakrishnan, Kala
Rao, Talasila P
Keywords: UV-probe
Rhodamine 6G
Issue Date: Nov-2012
Publisher: NISCAIR-CSIR, India
Abstract:   A highly sensitive and selective UV-molecular probe has been developed for detection of <span style="mso-ansi-language:EN-IN">low concentrations of nitrite in aqueous solution based on monotonous increase in absorbance of rhodamine 6G at 385 nm. Addition of nitrite also results in a bathochromic shift in UV absorption maximum of rhodamine 6G from 355 to 385 nm. The optimal conditions for parameters like concentration of H<sub>2</sub>SO<sub>4</sub> and rhodamine 6G, response time and stability is reported. Under optimised conditions, the developed UV-probe enables the determination of 0 to 0.5 mgL<sup>-1</sup> of nitrite. On the other hand, the addition of other anions like I<sup>-</sup>, SCN<sup>-</sup>, ClO<sub>4</sub><sup>-</sup>, [HgI<sub>4</sub>]<sup>2-</sup> and [Zn(SCN)<sub>4</sub>]<sup>2-</sup> shows a bathochromic shift from 525 (the visible range absorption maximum) to 575 nm with no perceptible absorption at 385 nm. This enabled a virtually specific UV-molecular probe for rapid, precise and reliable monitoring of traces of nitrite in environmental samples and food materials with no interference from other anionic or cationic species. Studies with pyronine G also exhibit similar spectral characteristics on addition of nitrite. </span>
Description: 1607-1612
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.51B(11) [November 2012]

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