Abstract
A method is presented for the selective preconcentration and determination of ultratrace amounts of Ce3+ ions by inductively coupled plasma-optical emission spectroscopy in the presence of Sm3+, La3+, Dy3+, Yb3+, and common interfering ions. In this method, thio-functionalized MCM-41 is used in the preconcentration step. Extraction efficiency and the influence of sample matrix, pH of sample solution, type and minimum amount of tripping acid, and flow rates were investigated. The preconcentration is pH-dependent, and the best results were obtained in the pH range of 8.5-10.3. The maximum capacity of 2 mg absorbent was found to be 170 +/- 4 microg. The detection limit of the measurements after the preconcentration step was found to be 114 ng Ce3+/L.
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