Discussion
Why is a hydrocarbon scrubber fitted upstream of a sulphur dioxide fluorescence analyser?
Answer: C
Aromatics such as xylene absorb the excitation and fluoresce themselves, or take energy from excited sulphur dioxide, so both a positive and a negative interference are possible. A selective permeation scrubber removes them while passing sulphur dioxide. Window fouling is a slow maintenance issue rather than the reason for the scrubber, no significant reaction occurs at cell conditions, and complete absorption of the excitation would be a far grosser effect than is observed.
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