Preconcentration and separation of gold on modified silica gel

HÁJKOVÁ, Jana, Viktor KANICKÝ and Vítězslav OTRUBA. Preconcentration and separation of gold on modified silica gel. Collection of Czechoslovak Chemical Communications. Prague: IOCB, 2000, vol. 65, No 12, p. 1848-1864. ISSN 0010-0765.

Basic information

• Original name: Preconcentration and separation of gold on modified silica gel
• Authors: HÁJKOVÁ, Jana (203 Czech Republic), Viktor KANICKÝ (203 Czech Republic, guarantor) and Vítězslav OTRUBA (203 Czech Republic).
• Edition: Collection of Czechoslovak Chemical Communications, Prague, IOCB, 2000, 0010-0765.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10406 Analytical chemistry
• Country of publisher: Czech Republic
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 0.960
• RIV identification code: RIV/00216224:14310/00:00002851
• Organization unit: Faculty of Science
• UT WoS: 000167546600003
• Keywords in English: Solid phase extraction; Gold; Ionic associates; Atomic emission spectrometry; Inductively coupled plasma
• Tags: atomic emission spectrometry, gold, inductively coupled plasma, Ionic associates, Solid Phase Extraction
• Tags: Reviewed

Abstract

Gold was preconcentrated in the form of ion associates of its chloro- or cyanocomplexes with quarternary onium salts on C18 modified silicagel and eluted analyte was determined using inductively coupled plasma atomic emission spectrometry

Abstract (in Czech)

Selective preconcentration of gold in the form of ion associates of Au(III) chloro complex or Au(I) cyano complex with quaternary bases was studied using modified silica gel. Solutions containing gold in the presence of the complexing anion and a quaternary base were pumped through a Separon(TM) SGX C18 column. After elution with 96 vol.% ethanol, the eluate was evaporated in the presence a complexing agent (chloride or cyanide). The resulting aqueous solutions were analyzed with inductively coupled plasma atomic emission spectrometry. The influence of concentration of onium salts, chlorides, nitrates, and the influence of the sample volume on the sorption were studied. The sorption flow rate and the elution volume were optimized, and the separation from a geological sample matrix was verified. The best recovery (100%) of preconcentration of Au(III) chloro complex was obtained with [1-(ethoxycarbonyl)pentadecyl] trimethylammonium bromide and 1-hexadecylpyridinium chloride at concentrations of 0.006 and 0.004 mol dm(-3), respectively. The sorption flow rate of a sample may vary in the range 0.4-7 cm(3) min(-1) the elution volume was between 5 and 6 cm(3) The recovery decreased with increasing sample volume above 250 cm(3) and was diminished by 10% in the presence of nitrates above 0.4 mol dm(-3). Major accompanying elements Fe and Mn, which considerably interfere at the Au I 242.795 nm line, were quantitatively separated from gold. A Czech certified reference material 1001 Mokrsko was analyzed using the developed preconcentration technique and inductively coupled plasma atomic emission spectrometry, inductively coupled plasma mass spectrometry, and atomic absorption spectrometry. Sorption of ion associates of Au(I) cyano complex was also efficient.

Links

• VS97020, research and development project: Name: Laboratoř plazmových zdrojů pro chemickou analýzu

Investor: Ministry of Education, Youth and Sports of the CR, Laboratory of plasma sources for chemical analysis