Journal
SPECTROSCOPY LETTERS
Volume 42, Issue 1, Pages 42-48Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00387010802428427
Keywords
catalytic kinetic; fluorescent quenching method; gold(III); 3-(3'-methylphenyl)-5-(2'-arsenoxylphenylazo) rhodanine; solid-phase extraction
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Funding
- Science Research Foundation of Shandong Province, China [Y2007B07]
- Key Subject (Laboratory) Research Foundation of Shandong Province, China [XTD0705]
- National Eleventh Five-Year Plan, China [2006BAJ03A09]
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A new catalytic kinetic fluorescent quenching method for the determination of trace gold(III) was investigated. The method was based on the catalytic effect of gold on oxidation of 3-(3'-methylphenyl)-5- (2'-arsenoxylphenylazo) rhodanine by hydrogen peroxide in potassium hydrogen phthalate-hydrochloric acid (pH=3.4). Under the optimum conditions, the great decrease of fluorescence intensity has a linear relationship against the concentration of gold in the range of 0 to 12.0gL-1 with a detection limit of 6.010-10gL-1. The coexistent metal ions can be separated, and gold can be enriched by TBP resin of solid-phase extraction, which greatly improves the selectivity and sensitivity of the system. The method can be used to determine trace amounts of gold in ore samples successfully with satisfactory results.
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