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Title: Spectrophotometric determination of nitrite using new coupling agents
Authors: Veena, K
Narayana, B
Keywords: Spectrophotometry
Diazotization
Nitrite
Frusemide
5-methyl-4-{[(1E)-phenylmethylene] amino}-2, 4-dihydro-3H-1,2, 4-triazole-3-thione
Issue Date: Jan-2009
Publisher: CSIR
Abstract: A method is described for the spectrophotometric determination of nitrite. It is based on the reaction of nitrite with p-nitroaniline (PNA) in acid medium to form diazonium ion, which is coupled with frusemide (FRU) or 5-methyl-4-{[(1E)-phenylmethylene]amino}-2,4-dihydro-3H-1,2,4-triazole-3-thione (MPAT) in basic medium to form azo dyes, showing absorption maxima at 680 or 395 nm respectively. The range of linearity for PNA-MPAT and PNA-FRU system are 0.4-2.0 μg/mL, 0.02-0.6 μg/mL of nitrite respectively. Molar absorptivity, Sandell sensitivity, Detection limit, Quantitation limit for PNA-MPAT and PNA-FRU system were found to be 3.314 × 10³ Lmol⁻¹cm⁻¹, 0.014 μg cm⁻², 0.559 μg mL⁻¹, 1.695 μg mL-1and 1.46 × 10³ Lmol⁻¹cm⁻¹, 0.032 μg cm⁻², 0.485 μg mL⁻¹, 1.470 μg mL⁻¹ respectively. The method has been applied to various water samples, soil samples and tablets.
Page(s): 89-92
ISSN: 0971–457X
Source:IJCT Vol.16(1) [January 2009]

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