TERMIUM Plus®

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IMPREGNATED FILTER [1 record]

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Record 1 1989-03-31

English

Subject field(s)
  • Scientific Instruments
  • Environmental Studies and Analyses
  • Air Pollution
CONT

Impregnated filters. These methods use the reaction of SO2 with a basic compound which can then be measured colorimetrically. Generally samples are gathered on filters which have been impregnated with a solution such as potassium carbonate which reacts with SO2. The sulfite salt is oxidized to SO4 with hydrogen peroxide and is reacted with a barium-thorin complex to provide a coloured solution of the liberated thorin whose absorbance is proportional to the SO2 content.

French

Domaine(s)
  • Instruments scientifiques
  • Études et analyses environnementales
  • Pollution de l'air

Spanish

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