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Which of the following are not the characteristics of colorimetry method used to monitor sulphur dioxide?

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Which of the following are not the characteristics of colorimetry method used to monitor sulphur dioxide?

(a) It is simple

(b) It has high sensitivity

(c) It has good specificity

(d) It is affected by interference from H2SO4, SO3, NH3, etc

I had been asked this question during an interview.

My enquiry is from Sulphur Di-oxide Monitoring in section Pollution Monitoring Instruments of Analytical Instrumentation

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Correct answer is (d) It is affected by interference from H2SO4, SO3, NH3, etc

Explanation: Colorimetry method is free from by the interference due to other gases such as It is affected by interference from H2SO4, SO3, NH3, etc. Colour intensity is sensitive to temperature.

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