Speciation and enrichment of cadmium and lead from water samples using Fe3O4/rGO sorbent in dispersive magnetic micro-solid phase extraction with inductively coupled plasma-optical emission spectroscopy

• Published in: Asian Journal of Chemistry
• Main Author: Hanapi N.S.M.; Safie W.; Anis A.L.; Zaini N.; Ibrahim W.N.W.; Abdullah U.A.A.U.
• Format: Article
• Language: English
• Published: Asian Publication Corporation 2021
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85108887987&doi=10.14233%2fajchem.2021.23224&partnerID=40&md5=00d18fcd1752183262a207e0850ae34c

This work reports the development of dispersive magnetic solid-phase extraction (DMSPE) with high resolution ICP-OES for the pre-concentration of cadmium and lead in water samples. The method uses magnetic reduced graphene oxide (Fe3O4/rGO) as adsorbent. The influences of sample pH, extraction time, desorption solvent and desorption time were evaluated and optimized. In the optimized conditions, linear calibration curves for Cd2+ and Pb2+ were obtained in the range of 10-2000 µg L-1 with correlation coefficients of 0.9996 and 0.9995, respectively. Low detection limits of Cd2+ and Pb2+ were found to be 9.03 µg L-1 and 12.4 µg L-1, respectively. Good relative recovery values, in the range of 91-95% and excellent repeatability of 6.4-9.9%, (n = 3) were obtained. The results revealed that Fe3O4/rGO can be a suitable nanocomposite sorbent in the speciation and pre-concentration of Cd2+ and Pb2+ for tap water and drinking water samples. The method is rapid, selective, reliable and environmentally friendly for the determination of Cd2+ and Pb2+ in water samples. © 2021 Chemical Publishing Co.. All rights reserved.