Abstract
An indirect method for the determination of iodine as iodide by continuous-flow cold-vapor generation of mercury and atmospheric pressure helium microwave induced plasma atomic emission spectrometry (MIP-AES) is described. The method is based on the decrease of mercury emission intensity in highly acidic solutions due to the interference effect of iodide, i.e., the formation of stable mercury(II) iodide complexes. Under the optimized experimental conditions, analytical working graphs have been linear over the concentration range of 2–100 ng/ml of iodide. The best attainable detection limit by the indirect MIP-AES method is 0.74 ng/ml of iodine. The present method has successfully been applied to the determination of total iodine in seawater and brine.
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