Coupling of membrane introduction with mass spectrometer (MIMS)

The described interface for membrane introduction mass spectrometry (MIMS) makes it possible to directly determine concentrations of organic substance s in water solution without any preconcentration technique. Some nonpolar, semipolar and semivolatile substances were chosen as examples for demonstra tion of the MIMS function. Various kinds of membranes were tested. The dete ction limit, calibration curves and mutual interference of substances were determined for benzene, naphthalene and propnn-1-ol, Ion current intensitie s were measured in thr SIM mode. Hydrolysis of ethyl acetate with NaOH was chosen as an example of in-situ kinetic study using MIMS.