The invention relates to a direct sample introduction type method and a direct sample introduction type instrument for simultaneously measuring mercury and
cadmium, which do not need to digest a sample. The direct sample introduction type method for simultaneously measuring mercury and
cadmium comprises the steps of heating a sample in an aerobic environment, controlling the temperature in the scope from 120 DEG C to 500 DEG C, and separating most Hg and a
decomposer out from the sample; loading Hg (mercury) and the
decomposer into a catalytic furnace by an air flow to be further decomposed, absorbing Hg with Au, and keeping Cd (
cadmium) be in the sample; putting the processed sample into a
cracking furnace to be further thermally decomposed, and vaporizing Cd and residual H in the sample at a high temperature; loading the vaporized Cd and residual Hg into a Cd atom trap by
argon, selectively
trapping the Cd by a
tungsten filament, and absorbing the residual Hg by a Hg trap; and heating the
tungsten filament or a
molybdenum filament and gold amalgamation in the
argon and
hydrogen gas to release Cd and Hg, and carrying Cd and Hg into an
atomic fluorescence spectrometer by the
argon and the
hydrogen. On the basis of realizing the function of simultaneously measuring Hg and Cd, the direct sample introduction type method and direct sample introduction type instrument for simultaneously measuring mercury and cadmium have the advantages that the structure of the entire measurement instrument is simplified so as to miniaturize the instrument, so that the instrument can conveniently meet the requirements of the
conventional analysis and emergencies, and can be carried to the field by a vehicle. Moreover, the direct sample introduction type method and the direct sample introduction type instrument for simultaneously measuring mercury and cadmium have application prospect in the
field detection.