mortazavi nik, vahid, kanoz, elahe, Feizbakhsh, Alireza, Mehrdad Sharif, Amir Abdullah. “Microextraction and preconcentration of nickel in chocolate samples by SrFe12O19@CTAB magnetic nanoparticles and determination by electrothermal atomic absorption spectroscopy.” Journal of applied research in chemisry, vol. 15, no. 4, 2022, pp. 118-132. 10.30495/jacr.2022.689065