Preconcentration and Solid Phase Extraction of Trace Metal Ions by Chemically Modified Graphene Oxide Nanoconstructs

The toxicity of arsenic and mercury is highly dependent on their unique chemical forms, mobility, bioavailability, biological roles. This places a strong demand specific metal species analysis rather than total quantification. Graphene oxide (GO) an excellent adsorbent for the extraction ions; however, functional moieties GO surface are not ion-specific. In this work, we chemically introduced thioglycolic acid to improve ion selectivity after dual oxidation graphite generate graphene nanosheets. prepared was characterized by various spectroscopic microscopic techniques. A solid phase method developed careful optimization sorbent. shows fairly good quantification limit 0.20 µg L−1 As(III) Hg(II) ions. From diverse water samples, proposed sorbent preferentially removes ions (tap groundwater). remarkable wettability analyte accessibility that surface-bonded thiol functionality sheets offers exciting feature. lesser amount time, GO−SH nanosorbent exhibits traces Hg(II). reliability precision in terms accuracy relative standard deviation (RSD 3.8%; N = 5) has low detection limits (0.04 L−1). Real samples had been spiked predefined level were analyzed order validate established procedure.