HELIUM MICROWAVE-INDUCED PLASMA-ATOMIC EMISSION DETECTION FOR LIQUID-CHROMATOGRAPHY UTILIZING A MOVING BAND INTERFACE

A moving band interface is used to separate HPLC solvent from analyte before introduction into a microwave-induced plasma atomic emission de tector. Spectral scans indicate that all detectable solvent is removed prior to analyte introduction. Analyte memory effects are not detecta ble. Chlorine element selective detection limits are 140,410, 220, and 770 pg/s for 9-chlorofluorene, p-chlorobiphenyl, 4-chlorobenzophenone , and alpha,alpha-dichloro-o-oxylene, respectively. If the vaporizatio n region is heated significantly, chlorine selective response is depen dent upon the boiling point of the compound due to analyte volatilizat ion before it reaches the detector.