Abstract
A high-performance liquid chromatography/electrospray ionization mass spectrometry (HPLC/ESI-MS) method has been developed for the separation and detection of a series of carboxylic acids with one or more carboxyl groups, which can be formed during air oxidation of lignite. Chromatographic separation used an RP-C18 column with a gradient of water [containing 0.01% (v/v) formic acid] and acetonitrile, at a flow rate of 0.3 mL min−1. Detection by means of megaflow electrospray-MS was performed in the negative-ion mode [ESI(–)] at different cone voltages. The ESI(–) mass spectra of the carboxylic acids at a cone voltage of −20 V are characterized by the formation of [M – H]− anions together with fragmentation by loss of CO2 and sometimes H2O. Increasing the cone voltage effects enhanced fragmentation and leads to further structural hints. Lignite-derived analytes used for these HPLC/ESI-MS investigations were enriched from aqueous solution by solid-phase extraction on ISOLUTE ENV+, a polystyrene copolymer. F...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
