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Total ion chromatogram of HX. (ESI+) represents the positive ion detection mode, in which the mass analyzer scans only positively charged ions and filters out negatively charged ions. This allows us to obtain positively charged ion information during the detection process; (ESI-) denotes the negative ion detection mode, in which the mass analyzer scans only negatively charged ions and filters out positively charged ions, thus obtaining information regarding negatively charged ions.
