Abstract
This paper describes an improvement of detection capability for microwave-induced plasma atomic absorption spectrometry (MIP-AAS) by using a modified desolvation system, which includes heated tubing, a water-cooled condenser and a concentrated sulfuric acid desiccator. The influence of heating temperature, carrier-gas flow rate and microwave power on the analytical performance of MIP-AAS has been examined and the relationship between these experimental parameters discussed. The desolvation efficiencies of the different steps, such as in the water-cooling system and sulfuric acid desiccator, have been quantitatively measured using silica gel traps. Under the optimized experimental conditions, an overall desolvation efficiency of as high as 99% is achieved by using this recommended desolvation system. The analytical figures of merit for MIP-AAS are compared and evaluated under different desolvation conditions.
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