Chemiluminescence method for the direct determination of sulphur dioxide
Abstract
A method for the determination of SO2 based on the fact that it enhances the chemiluminescence produced by the reaction of luminol with H2O2 has been developed. The calibration graph for SO2 was a straight line with a correlation coefficient of 0.998 from 1 to 1000 p.p.b. (V/V). The detection limit (signal to noise ratio = 3) was 0.6 p.p.b. and the relative standard deviation for ten measurements of 10 p.p.b. of SO2 was 5.3%. The method required 1 min or less for the determination of 10 p.p.b. of SO2. Ozone and nitrogen dioxide interfered but were almost completely removed by using a tube packed with glass beads coated with FeSO4. Sulphur trioxide and the other gases except H2S did not interfere.