Question

Which of the following materials are used as a gel to which biocatalytic membrane is fixed in ammonia selective electrode?

(a) Urea

(b) Urease

(c) Acrylamide

(d) Polyacrylamide

This question was addressed to me at a job interview.

Query is from Special Designs of Ion Selective Electrodes topic in chapter pH Meters and Ion Analysers of Analytical Instrumentation

Answer 1

Correct option is (c) Acrylamide

Easy explanation: The material used as a gel to which biocatalytic membrane is fixed in ammonia selective electrode is acrylamide. This is attached to the ion selective electrode directly.