Abstract: A method and apparatus for measuring the constituent elements of a liquid, electrically conductive material includes a probe housing, which delimits a sampling chamber constructed to contain a non-reactive gas, and includes an entry mechanism for introducing aliquot of the liquid material into the sampling chamber. An inner housing is located within the probe housing and is moveable longitudinally relative thereto. A housing adjustment mechanism selectively positions the inner housing longitudinally relative to the probe housing. A spark electrode is disposed within the inner housing and is in communication with the sampling chamber. This electrode is longitudinally moveable relative to the inner housing and is constructed to spark an electrical arc discharge between the spark electrode and the free surface of the liquid aliquot, thereby producing a aerosol sample composed of particles of the material in the gas.