Issue 5, 2019

Solid-phase dispersive microextraction using reduced graphene oxide for the sensitive determination of cadmium and lead in waters

Abstract

A graphene oxide suspension is treated with sodium citrate in the presence of silver ions, and then nanoparticles of the composite containing reduced graphene oxide and metallic silver are obtained. A small amount (0.1 mg) of this material is dispersed into a liquid sample (10 mL) at pH 8 allowing very small amounts of cadmium and lead to be retained. The separation of the solid phase is carried out by means of a cloud point extraction process using Triton X-114. Lead and cadmium are then measured in the surfactant-rich phase by electrothermal atomic absorption spectrometry. The enrichment factor is 105 which provides detection limits of 2 and 30 ng L−1 for cadmium and lead, respectively. The relative standard deviations calculated for six measurements at three concentration levels are in the 3.7–4.5% range. The reliability of the procedure is verified by analysing six water samples with certified cadmium and lead contents.

Graphical abstract: Solid-phase dispersive microextraction using reduced graphene oxide for the sensitive determination of cadmium and lead in waters

Supplementary files

Article information

Article type
Paper
Submitted
15 Nov 2018
Accepted
23 Dec 2018
First published
26 Dec 2018

Anal. Methods, 2019,11, 635-641

Solid-phase dispersive microextraction using reduced graphene oxide for the sensitive determination of cadmium and lead in waters

I. López-García, J. J. Marín-Hernández and M. Hernández-Córdoba, Anal. Methods, 2019, 11, 635 DOI: 10.1039/C8AY02495B

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