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The biocatalytic membrane used in the ammonia selective electrode is which of the following?

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The biocatalytic membrane used in the ammonia selective electrode is which of the following?

(a) Urea

(b) Urease

(c) Acrylamide

(d) Polyacrylamide

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

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The correct option is (b) Urease

Explanation: The biocatalytic membrane used in the ammonia selective electrode is urease. It is used for the detection of ammonia.

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