Journal
TALANTA
Volume 172, Issue -, Pages 8-14Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2017.05.017
Keywords
Chromium; Speciation; Graphene oxide; Cloud point extraction; Waters; Electrothermal atomic absorption spectrometry
Categories
Funding
- Comunidad Autonoma de la Region de Murcia (CARM, Fundacion Seneca) [19888/GERM/15]
- Spanish MINECO [CTQ2015-68049-R]
- European Commission (FEDER/ERDF)
Ask authors/readers for more resources
A graphene oxide (GO) suspension was used to retain chromium (III) species in a neutral solution. The addition of Triton X-45 followed by heating resulted in a coacervate, to which the GO nanoparticles containing the analyte retained were transferred. Chromium was determined directly in the surfactant-rich phase by electrothermal atomic absorption spectrometry. The procedure was repeated using a second aliquot of sample to which sodium hydrogen sulphite was added to reduce chromium (VI) to chromium (III). By again obtaining the analytical signal of chromium in the condensed phase, the concentration of the hexavalent form was calculated by difference. Using 10 mL for the sample volume and 0.01% for the Triton X-45 concentration, the enrichment factor was 140, and the detection limit was 5 ng L-1. The repeatability for five consecutive measurements at the 100 ng L-1 level was close to 5%. The reliability of the procedure was verified by analysing seven water samples with certified contents of total chromium. Speciation data are given for these standard materials and for seven potable waters and one seawater sample.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available