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Determination of SO2 and S03 in emission an alternative to the thorine method

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The color transition for the titration of SO2 from emissions in the stack using thorine, methylthymol blue, metalphtaleine and thymolphtalein complexone as indicators is studied. Use of a new screened indicator thorine-carmin indigo (6.25 to 10.0) (W/W) is found to be the best procedure for the titration of sulphate. Every chromatic transition is obtained and classified.

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Nerin, C., Vizcaino, J.L., Cacho, J. et al. Determination of SO2 and S03 in emission an alternative to the thorine method. Water Air Soil Pollut 45, 97–103 (1989).

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  • Color
  • Sulphate
  • Titration
  • Indigo
  • Good Procedure