Flow injection spectrofluorimetric measurement of oxidants formed by an atmospheric photochemical reaction using naphthalene-2-thiol

Abstract

A method for the determination of photochemical oxidants in air by flow injection with detection of the decrease in fluorescence, based on the reaction of iodine with naphthalene-2-thiol, has been developed. The decrease in fluorescence was linear over the range 0–10 × 10^–6 mol dm^–3 of iodine. The relative standard deviation was below 1.0% at the 5 × 10^–6 mol dm^–3 level of iodine in the absorbent solution, and the detection limit for photochemical oxidants in air was 2 ppb (v/v) in a 20 dm³ sample of air. The sample throughput was 30 h^–1.