Solidified floating organic drop microextraction for the determination of trace Dy and Y by electrothermal vaporization inductively coupled plasma mass spectrometry

Abstract

A method was developed for the determination of trace Dy and Y in biological and environmental water samples based on solidified floating organic drop microextraction (SFODME) combined with electrothermal vaporization (ETV) inductively coupled plasma mass spectrometry (ICPMS). 1-(2-pyridylazo)2-naphthol (PAN) was used as both chelating reagent in SFODME and chemical modifier in ETV for separation, preconcentration, and volatilization of the REEs prior to their determination. The main factors affecting the preconcentration and determination, including pH, amount of PAN, extraction time, stirring rate, sample solution volume, and temperature program, were examined in detail. Under the selected conditions, the detection limits of this method were 0.019 pg mL-1 of Dy and 0.032 pg mL-1 of Y, and the relative standard deviations were 4.7% and 5.4%, respectively (n=9, c=0.1 ng mL -1). This method was applied for the determination of trace Dy and Y in certified reference material and natural water samples with recoveries of 91.3-108%.