Abstract
In this paper, a new and novel method of ultrasonic-assisted dispersive liquid phase microextration was applied for the pre-concentration of trace strontium ion in water samples, which was determined by inductively coupled plasma optical emission spectroscopy. In this pretreatment, acetonitrile was used as dispersive solvent, 1,1,2,2-tetrachloroethane as an extractant and dicyclohexyl-18-crown-6 as the chelating reagent. The factors influencing the extraction of the method were optimized. These factors were type and volume of extraction solvents, the type and volume of dispersive solvents, pH value and extraction time. The linear ranged from 40 to 2000 mu g/L with the limit of detection of 12 mu g/L. Under the optimum condition, the amount of strontium and the variation of strontium isotopic composition in four real water samples were investigated by the proposed method. The method can be applied to the determination of strontium and its isotopic composition in environmental samples.
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