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Which of the following are added for pH adjustment in sodium analyser?

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Which of the following are added for pH adjustment in sodium analyser?

(a) Acidic solution

(b) Basic solution

(c) Hydrazine

(d) Ammonia buffer

This question was addressed to me by my school teacher while I was bunking the class.

The query is from Sodium Analyser topic in portion Dissolved Component Analysers of Analytical Instrumentation

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Correct option is (d) Ammonia buffer

To explain: Ammonia buffer is added for pH adjustment in sodium analyser. This is added to the reference and sample solutions.

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