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Effects occurring in quantitative analyses from salt-rich solutions and of easily oxidizable analytes were studied using an Extractive Electrospray Ionization (EESI) source. A low detection limit of 100pM was achieved for the drug propanolol in the presence of 25mM TRIS salt. The oxidation of TEMPO, a stable radical, was found to be dependent on the solvent flows and could be related to a competition...
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