A Two-Stage Probe Atomizer for Zeeman Atomic Absorption Spectrometry with High-Frequency Modulation of Radiation Polarization

Resumo

A two-stage probe atomizer for direct analysis of samples that strongly smoke when evaporating (oil, food suspensions, etc.) by Zeeman atomic absorption spectrometry with high-frequency modulation of the polarization of the transmission radiation has been proposed. The effective ventilation of the atomizer and independent heating of the tungsten probe in a strong magnetic field of the atomizer have been provided for sensitive detection of atomic absorption pulses without overlapping of the transmission beam by the probe. The performance of the atomizer has been illustrated on the MGA-915MD spectrometer by the behavior of the signals of the Ag and Al test elements depending on the heating modes, probe position, and diameter of the dosing hole of a graphite furnace. The range of concentrations to be determined has been extended by a factor of 50, while maintaining an error at a level that is acceptable for quantitative analysis.