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Analytica Chimica Acta,
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Description: The usage of a variety of sorbents has been shown as promising matrix removal/preconcentration strategies for the determination of rare earth elements (REEs) in various natural water samples by inductively coupled plasma atomic emission spectrometry (ICP-AES). The sorption efficiency of various zeolites (clinoptilolite, mordenite, zeolite Y, zeolite Beta), ion-exchangers (Amberlite CG-120, Amberlite IR-120, Rexyn 101, Dowex 50W X18) and chelating resins (Muromac, Chelex 100, Amberlite IRC-718) towards REEs was investigated in terms of solution pH, shaking time and sorbent amount. The results have shown that most of the materials can take up REEs at a wide pH range. The experiments were continued with clinoptilolite, zeolite Y and Chelex 100 and it was demonstrated that all three materials displayed very fast kinetics for REE sorption (higher than 96% in 1 min). Desorption from the sorbents was realized with 2.0M HNO"3 for clinoptilolite and 0.1M HNO"3 for zeolite Y and Chelex 100. Only the lower concentration range (0.01-2.0mgl^-^1) of matrix-matched standards were used in quantitation although the calibration graphs were linear at least up to 10.0mgl^-^1 for all REEs studied. The limit of detection (3s) without preconcentration was 0.1, 1.0, and 0.2@mgl^-^1 for Eu, La, and Yb, respectively. The validity of the method with the selected sorbents was checked through spike recovery experiments. .
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