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Optical sensors for dissolved sulfur dioxide

Stangelmayer, Achim ; Klimant, Ingo ; Wolfbeis, Otto S.
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Date of publication of this fulltext: 06 Jun 2011 13:40


Abstract

Colorimetric sensing membranes for the determination of sulfur dioxide were developed and characterized. These films can be used for sensing trace amounts of sulfur dioxide both in the gas phase and in aqueous solutions. Lipophilic pH indicator ion pairs were immobilized in hydrophobic gas-permeable silicone and phenyl substituted ormosil. On exposure to SO₂ the films undergo a visually ...

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