Journal
ANALYTICAL METHODS
Volume 11, Issue 5, Pages 635-641Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ay02495b
Keywords
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Funding
- Comunidad Autonoma de la Region de Murcia (CARM, Fundacion Seneca) [19888/GERM/15]
- Spanish MINECO [CTQ2015-68049-R]
- European Commission (FEDER/ERDF)
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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 cadmiumand lead contents.
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