and silver(I) ions. ... Silver and its compounds have an essential role in elec- ..... a Based on Amberlite XAD-2000 resin modified with diethyldithiocarbamate.
Microchim Acta DOI 10.1007/s00604-017-2299-8
ORIGINAL PAPER
A magnetized graphene oxide modified with 2-mercaptobenzothiazole as a selective nanosorbent for magnetic solid phase extraction of gold(III), palladium(II) and silver(I) Mahmoud Reza Neyestani 1 & Farzaneh Shemirani 2 & Shahla Mozaffari 1 & Mahrouz Alvand 2
Received: 13 December 2016 / Accepted: 25 April 2017 # Springer-Verlag Wien 2017
Abstract This article describes a useful sorbent for separation and preconcentration of trace amounts of gold(III), palladium(II) and silver(I) ions. Graphene oxide (GO) nanoparticles were synthesized by a modified Hummers method and magnetized by MnFe2O4 nanoparticles to give a sorbent referred to as mag-GO. Addition of sodium dodecyl sulfate creates admicelles on the surface of the mag-GO. Then the metal chelating agent 2mercaptobenzothiazole (MBT) was immobilized on mag-GO to give a mag-GO-MBT type material. This adsorbent was applied to the preconcentration of gold(III), palladium(II) and silver(I) ions. Following ion desorbed with a solution of thiourea, the ions were quantified by flow injection coupled to ICPOES. Effect of sample pH value, type and volume of eluent, amount of adsorbent, sample volume, time of adsorption and desorption were optimized. Under optimized condition, the calibration plots are linear in the 2.5 to 25,000 μg.L−1 concentration range. The limits of detection range from 0.045 to 0.076 μg.L−1, and enhancement factors are 160, 160 and 140 for gold, palladium and silver ions, respectively. Precisions, expressed as relative standard deviation for 100 μg.L−1 of each ion are
