A DC arc technique combined with simple chamber electrode is used for excitation and a mixture of potassium iodide,sulfure, potaassium pyrosulfate and graphite powder was selected as reactant-buffer. The electrodes need to be pretreated by impregnating in a saturated solu- tion of K2S2O7 containing minor amounts of iodine and potassium iodide in order to prevent the escaping of sample vapor from the wall of chamber elec- trode and suppress the intensive evaporation of rock-forming elements. The analytical sensitivity is enhanced and the spectral interference of Sb and As limes by the ghost from Si and Mg lines is reduced. The method can be used to analyze these elements simultaneously with a 1-meter grating spectrometer. The detection limits of these elements are: Ge, In, Tl and Bi~0.1ppm;Sb~0.3ppm; Cd~0.5ppm; A~3 ppm.