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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hartmann, Georg Schuster, Michael |
| Description | Country affiliation: Germany Author Affiliation: Hartmann G ( Department of Chemistry, Technische Universität München, 85748 Garching, Germany. georg.hartmann@tum.de) |
| Abstract | The determination of metallic nanoparticles in environmental samples requires sample pretreatment that ideally combines pre-concentration and species selectivity. With cloud point extraction (CPE) using the surfactant Triton X-114 we present a simple and cost effective separation technique that meets both criteria. Effective separation of ionic gold species and Au nanoparticles (Au-NPs) is achieved by using sodium thiosulphate as a complexing agent. The extraction efficiency for Au-NP ranged from 1.01 ± 0.06 (particle size 2 nm) to 0.52 ± 0.16 (particle size 150 nm). An enrichment factor of 80 and a low limit of detection of 5 ng L(-1) is achieved using electrothermal atomic absorption spectrometry (ET-AAS) for quantification. TEM measurements showed that the particle size is not affected by the CPE process. Natural organic matter (NOM) is tolerated up to a concentration of 10 mg L(-1). The precision of the method expressed as the standard deviation of 12 replicates at an Au-NP concentration of 100 ng L(-1) is 9.5%. A relation between particle concentration and the extraction efficiency was not observed. Spiking experiments showed a recovery higher than 91% for environmental water samples. |
| File Format | HTM / HTML |
| ISSN | 00032670 |
| Volume Number | 761 |
| e-ISSN | 18734324 |
| Journal | Analytica Chimica Acta |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2013-01-25 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Analytical Discipline Chemistry Chemical Fractionation Methods Gold Isolation & Purification Metal Nanoparticles Analysis Water Pollutants, Chemical Limit Of Detection Ultrastructure Polyethylene Glycols Chemistry Rivers Spectrophotometry, Atomic Surface-active Agents Thiosulfates Waste Water Evaluation Studies Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Environmental Chemistry Analytical Chemistry Biochemistry |
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