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Which of the following gas permeable membrane is used for carbon dioxide gas sensing electrode?

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Which of the following gas permeable membrane is used for carbon dioxide gas sensing electrode?

(a) Silicon rubber

(b) PVC membrane

(c) Fluorocarbon

(d) Polythene

This question was addressed to me in an online interview.

The above asked question is from Special Designs of Ion Selective Electrodes in division pH Meters and Ion Analysers of Analytical Instrumentation

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Right answer is (a) Silicon rubber

Easy explanation: Gas permeable membrane used for carbon dioxide sensing electrode is silicon rubber membrane. For each gas different membranes are used.

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