Why is there residual nitrogen in a cation exchange membrane (CMX-SB, Neosepta®)?

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David Jensen

There shouldn't be any nitrogen. Reflux of PS-DVB material in sulfuric acid is how the polymer is sulfonated.

Shyam Suwal

Thank you David jensen for your response. Actually, I did LECO analysis to determine the total N present and it in fact showed a significant amount of N.

Do you happen to know the sulfur content? Could the counter ion on the sulfonic group contain a nitrogen atom?