Simple in situ Visual and Tristimulus Colorimetric Determination of Sulfur Dioxide in Air

  • VLADIM˝R PITSCHMANN Oritest spol s r.o., StaropramennÆ 17, 150 00 Prague, Czech Republic
  • ZBYNK KOBLIHA NBC Defence Institute, University of Defence, Vta NejedlØho 691, 682 01 Vykov, Czech Republic
  • EMIL HAL`MEK NBC Defence Institute, University of Defence, Vta NejedlØho 691, 682 01 Vykov, Czech Republic
  • IVANA TUAROV` Oritest spol s r.o., StaropramennÆ 17, 150 00 Prague, Czech Republic

Abstract

A simple in situ visual and tristimulus colorimetric method of determination of the trace amount of sulfur dioxide in air has been developed. Tristimulus colorimetry is based on application of threedimensional colour space L*a*b* according to CIE (Commission Internationale de l'clairage). L* represents lightness and a* and b* represent chromaticity.  The analytical method is based on drawing the harmful pollutants through a filter made of modified cotton fabric, which is planted on a special extension piece. The filter is saturated with chromogenic reagent based on 5,5'-dithiobis(2-nitrobenzoic acid) in the mixture of N,N-dimethylformamide  dimethyl sulfoxide (1 : 1). On the filter the orange colour appears; the intensity of the colour is assessed visually and/or by a tristimulus colorimeter (LMG 173, Lange, Germany). The detection limit is 0.01 mg.m-3. Interferences of reduction (especially hydrogen sulfide), oxidation, alkaline and acid agents have been describes. 

Published
Jun 1, 2006
How to Cite
PITSCHMANN, VLADIM˝R et al. Simple in situ Visual and Tristimulus Colorimetric Determination of Sulfur Dioxide in Air. Pakistan Journal of Analytical & Environmental Chemistry, [S.l.], v. 7, n. 2, p. 5, june 2006. ISSN 2221-5255. Available at: <http://pjaec.pk/index.php/pjaec/article/view/49>. Date accessed: 23 nov. 2017.