@article{amirkavei_dadfarnia_shabani_2013,  title={Dispersive liquid-liquid microextraction based on solidification of floating organic drop for simultaneous separation/preconcentration of nickel, cobalt and copper prior to determination by electrothermal atomic absorption spectrometry},  volume={36},  ISSN={0100-4042},  url={https://doi.org/10.1590/S0100-40422013000100012},  DOI={10.1590/S0100-40422013000100012},  number={1},  journal={Química Nova},  publisher={Sociedade Brasileira de Química},  author={Amirkavei, Mooud and Dadfarnia, Shayessteh and Shabani, Ali Mohammad Haji},  year={2013},  pages={63–68} }