u/Useful_Ship9705

I'm running samples of 0.1 N sulfuric acid solutions on a dionex system.

Eluent is carbonate/bicarbonate 10 mM.

I'm screening for trace anions but I get a big peak at around where the chloride peak should elute. The chloride peak appears as a small peak riding on the big peak which looks like a shark fin.

Any insight would be extremely appreciated.