Determination of nitrite ion using the reaction with 4-aminobenzotrifluoride and 1-naphthol
- 1 January 1986
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 111 (11) , 1335-1337
- https://doi.org/10.1039/an9861101335
Abstract
A rapid, sensitive and selective method for the determination of nitrite ion is described. It depends on the reaction of the intended ion with 4-aminobenzotrifluoride in acidic medium to form a diazonium ion, which couples with 1-naphthol in alkaline media to give a pinkish red azo dye that shows maximum absorption at 510 nm. Beer's law is obeyed over the concentration range 0.03–0.8 p.p.m. of nitrite with a molar absorptivity of 3.91 × 104 l mol–1 cm–1. The sensitivity of the method (expressed as the amount of nitrite corresponding to an absorbance of 0.001 at 510 nm in a 1-cm cell) is 0.0012 µg cm–2. The optimum reaction conditions for diazotisation and full colour development, the effects of variables and the effects of common interfering ions have been studied.Keywords
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