Abstract
A sensitive spectrophotometric method has been developed for the determination of benzene based on nitration of benzene to 1,3-dinitrobenzene and its subsequent reduction to 1,3-phenylenediamine. The 1,3-phenylenediamine so formed is determined by diazotization-coupling reaction using 1,3,5-trihydroxybenzene as coupling agent. The yellow orange azo dye formed in alkaline medium is measured spectrophotometrically at 415 nm. Beer's law is obeyed at 0.2-2.0 ppm benzene. The molar absorptivity is 3.07 x 10 4 dm 3 mol - 1 cm - 1 . The standard deviation and relative standard deviation are ′0.01 and 1.62%, respectively, for 40 μg of benzene per 25 ml analyzed over 7 days. The method may be used to determine benzene in petrol vapour, coke oven effluent and cigarette smoke.
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