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CE‐ESI‐MS analysis of singly charged inorganic and organic anions using a dicationic reagent as a complexing agent
Author(s) -
Lin Xiuli,
Gerardi Anthony R.,
Breitbach Zachary S.,
Armstrong Daniel W.,
Colyer Christa L.
Publication year - 2009
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200900303
Subject(s) - reagent , chemistry , chelation , inorganic chemistry , combinatorial chemistry , organic chemistry
A dicationic ion‐pairing reagent, N,N ′‐dibutyl 1,1′‐pentylenedipyrrolidinium, was used to form complexes with singly charged anions for their subsequent analysis by CE‐ESI‐MS in positive ion mode. This methodology offers the advantages of greater versatility and sensitivity relative to direct detection of the anions in negative ion mode, and it can be realized by a number of possible complexation strategies, including pre‐column, on‐column, and post‐column modes. Four model anions, perfluorooctanoate, benzenesulfonate (BZSN), monochloroacetate (MCA), and trifluoromethanesulfonimide were amenable to complexation with the dicationic reagent, yielding singly charged cations with greater m / z . By optimizing various parameters, including the CE separation buffer composition and pH, the concentration of the dicationic reagent, the mode of complexation, the nebulizing gas pressure, and the sheath liquid composition, it was possible to develop a robust CE‐ESI‐MS method appropriate for the analysis of anions in a tap water sample. By this method, LODs were found to be 20.9 and 1.31 ng/mL for MCA and BZSN, respectively.