A Non-equilibrium Approach to Temperature Calibration for Tungsten Filament Atomic Spectrometry

Abstract

A non-equilibrium approach voltamperometric temperature measurement for tungsten filament atomizers was developed to facilitate the transfer of thermal conditions between instruments that possess different power supply regulation modes and filaments. Large differences in the equilibrium and instantaneous temperatures were found during the pyrolysis and atomization steps of cadmium AAS analysis. By using the instantaneous temperature, the pyrolysis and atomization behaviors of cadmium were shown to be equivalent regardless of the power supply regulation mode. The pyrolysis conditions optimized for a 15 V filament were readily and accurately transferred to a 12 V filament by applying the non-equilibrium voltamperometric temperature model.