Determination of the rare earth elements La, Eu, and Yb using solidified floating organic drop microextraction and elect
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ORIGINAL PAPER
Determination of the rare earth elements La, Eu, and Yb using solidified floating organic drop microextraction and electrothermal vaporization ICP-MS Shizhong Chen & Xiuli Cheng & Yuanyuan He & Shengping Zhu & Dengbo Lu
Received: 29 June 2013 / Accepted: 19 September 2013 / Published online: 3 October 2013 # Springer-Verlag Wien 2013
Abstract We have developed a method for the determination of trace levels of the rare earth elements La, Eu, and Yb in biological and environmental samples. It is based on solidified floating organic drop microextraction using 1-(2-pyridylazo)2-naphthol (PAN) as a chelator, followed by electrothermal vaporization (ETV) and quantification by inductively coupled plasma mass spectrometry. PAN also acts as a modifier in ETV. The effects of pH, amount of PAN, extraction time, stirring rate, volume of sample solution, and temperature program were examined. Under optimized conditions, the detection limits are 2.1, 0.65 and 0.91 pg mL−1 for the elements La, Eu and Yb, respectively. The relative standard deviations are
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