Journal
TALANTA
Volume 84, Issue 1, Pages 109-115Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2010.12.031
Keywords
Ultrasound-assisted extraction; Dispersive liquid-liquid microextraction; Gold; ng g(-1) levels; Environmental samples
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Funding
- Spanish Ministry of Science and Innovation [CTQ2009-06956/BQU]
- Vigo University [09VIA08]
- Xunta de Galicia
- University of Vigo
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A new methodology was developed for the determination of ultratrace levels of gold in water samples, soils and river sediments. Dispersive liquid-liquid microextraction was used to preconcentrate the ion pair formed between AuCl4- and [CH3(CH2)(3)](4)N+ in a microliter-range volume of chlorobenzene using acetone as disperser solvent. When solid samples were analyzed, the method consisted of a combination of ultrasound-assisted extraction and dispersive liquid-liquid microextraction with final detection by electrothermal-atomic absorption spectrometry. Since an HCl medium was required for the formation of the AuCl4- complex, HCl together with HNO3 was used as extractants for ultrasound-assisted extraction. After optimization, the enrichment factor obtained was 220 for water samples. Moreover, the extraction efficiency was around 96%. The repeatability, expressed as relative standard deviation ranged from 3.6% to 9.7%. The instrumental detection limit was 8.4 ng L-1, whereas the procedural detection limits were 42 ng L-1 for water samples and 1.5 ng g(-1) for environmental solid samples. (C) 2010 Elsevier B.V. All rights reserved.
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