Spectrophotometric submicrodetermination of nitrites after double extraction of the azo compound produced

Macchi, G.; Cescon, Bruno

doi:10.1021/ac50160a059

Cited by 11 publications

(1 citation statement)

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“…Methods based on reactions other than diazo coupling have also been developed [11][12][13]. Methods were also reported involving the extraction of the azo dye formed, to improve the detection limit [14][15][16]. These extraction methods involve the use of large volume of solvent [14] or multiple extraction procedure [16].…”

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Extractive spectrophotometric determination of trace amounts of nitrogen dioxide, nitrite, and nitrate

Malingappa

Balasubramanian

1996

Mikrochim Acta

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Abstract.A sensitive extractive spectrophotometric method for the determination of nitrogen dioxide in air and nitrite and nitrate in water, soil and blood serum is described. Nitrogen dioxide in air is fixed as nitrite in a suitable trapping solution. The method is based on the diazo coupling reaction between pnitroaniline and N-(1-naphthyl)ethylenediamine dihydrochloride [NEDA]. The azo dye formed under aqueous conditions is extracted with isobutyl methyl ketone [IBMK]. The system obeys Beer's law over the range 0-3 Ixg of nitrite at 545 nm and the colour is stable for 3 h. The molar absorptivity of the colour system is 5.7 x 10 4 L mol-lcm-1. The relative standard deviation is 1.3% for ten determinations at 2 gg of nitrite. Nitrate is determined as nitrite after reduction on a cadmium column. Negative interferences from SO2, HzS , Cu 2 + and Cr a § and positive interference from Fe 2 § and Fe 3 § can be simply masked.

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confidence: 99%