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

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

(a) Silicon rubber

(b) Microporous Teflon membrane

(c) Fluorocarbon

(d) Polythene

The question was asked in homework.

This is a very interesting question from Special Designs of Ion Selective Electrodes topic in section pH Meters and Ion Analysers of Analytical Instrumentation

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Right answer is (c) Fluorocarbon

The explanation is: Gas permeable membrane used for ammonia sensing electrode is fluorocarbon membrane. For each gas different membranes are used.

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