Abstract
Aqueous sample solutions were nebulized by an ultrasonic nebulizer and the solvent was removed by a desolvation apparatus before introduction of the aerosol into the microwave-induced plasma (MIP). The desolvation system consists of a heating tube and a condenser associated with a concentrated H2SO4 desiccator. The water vapor was removed almost completely with the desolvation system. The detectability of microwave-induced plasma atomic emission spectrometry was therefore improved. The detection limits for P, Cl, Br, and I were 0.0045, 0.12, 0.23. and 0.06 μg/ml, respectively. Based on a study of the emission spectra of P, Cl, Br, and I in the range of 200 to 600 nm in He MIP, the optimum analytical lines for determination of corresponding elements were chosen.
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