MICRO-ANALYTIC METHOD FOR SIMULTANEOUS MULTI-ELEMENT DETERMINATION BY ELECTRO-THERMAL SAMPLE VAPORIZATION AND DETECTION BY OPTICAL EMISSION SPECTROMETRY IN LOW-POWER PLASMA MICROTORCHES

摘要

The invention relates to a micro-analytic method for simultaneous determination of a plurality of hazardous elements, such as: As, Ag, Cd, Cu, Hg, Sb, Sn, Pb and Zn from liquid micro-samples. According to the invention, the method consists in drying the liquid micro-sample at a temperature of 75°C, for 180 s, followed by electro-thermal evaporation at a temperature of 1500°C, the resulting vapour being carried into a capacitively-coupled plasma microtorch where it is excited, the emission signals of the elements obtained by excitation being simultaneously measured, using a low-resolution micro spectrometer.