A method for determining the coupling capacitance electrically non-conductive analytical samples in the case of the elemental analysis by means of gd - oes or gd - ms

摘要

A method for determining the coupling capacitance electrically non-conductive analytical samples in a glow discharge source for elemental analysis by means of optical smoulder discharge spectroscopy (gd - oes) with an ac voltage generator, and means for measuring the system capacity is, characterized by the following process steps:a) measuring the system capacity is c₀ at a plurality of different reference samples r with a known relative dielectric constant ε_r and a defined thickness d at the glow discharge source for elemental analysis to be used in the working state without glow discharge (blank),b) measuring the system capacity is c₀ on the sample to be analyzed p at the glow discharge source for elemental analysis to be used in the working state without glow discharge (blank),c) calculating the coupling capacitor c_pp the sample to be analysed p from the measured values c₀ of the reference samples r and the measured value c₀ the sample p with the inclusion of the known ε_r – and thickness values d of the reference samples r.