A simple field test for the determination of isophorone vapour in air

Abstract

A field method is described for determining isophorone vapour in air at concentrations of up to 280 mg m^–3. The vapour is collected in water and determined by its reduction of dodecamolybdophosphoric acid to molybdenum blue in the presence of perchloric acid. After removal of the yellow background colour of unreacted dodecamolybdophosphoric acid with sodium citrate solution, the isophorone concentration is determined by comparing the residual molybdenum-blue coloration with a series of colour standards. The apparatus used is simple and the time taken to complete an analysis is about 30 minutes.