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In-situ in-stack analysers are used for measuring concentrations of which of the following gases?

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in Environmental Engineering by (81.4k points)
In-situ in-stack analysers are used for measuring concentrations of which of the following gases?

(a) Ammonia

(b) Sulphur dioxide

(c) Nitrogen monoxide

(d) All of the mentioned

I had been asked this question during an online exam.

The query is from Air Pollution topic in chapter Air Pollution of Environmental Engineering

1 Answer

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Best answer
The correct choice is (d) All of the mentioned

To explain: In-site in-stack analysers work on the principle of second derivative spectroscopy to measure concentrations of ammonia, sulphur dioxide and nitrogen monoxide.

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