Journal
ANALYTICAL LETTERS
Volume 45, Issue 14, Pages 2096-2107Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00032719.2012.680088
Keywords
Cloud point extraction; Gallium; Indium; Urines and lake water samples
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Funding
- National Science Council of the Republic of China, Taiwan [NSC 98-2221-E-241-001]
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A simple, sensitive, and selective method for the determination of gallium and indium in different samples at trace levels is presented. This method was based on complexation of analyzes with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) in the presence of t-octylphenoxy-polyethoxyethanol (Triton X-100). After phase separation, the analyzed concentrations were determined by inductively coupled plasma optical emission spectrometry. Quantitative extraction of gallium and indium was performed at pH 7.0, 1.7mmol L-1, 5-Br-PADAP, 1.3% (w/v) Triton X-100 and at 75 degrees C. The relative standard deviations (RSD) of this method were between 0.3% and 1.6%(C = 20 ngm L-1, n = 9). The calibration curve is linear over the concentration range 6-200 ngm L-1 for gallium and 2-200 ng mL(-1) for indium, respectively. The limits of detection (LOD) for gallium and indium were 0.72 and 0.28 ng mL(-1), respectively. The results showed the developed method was not susceptible to matrix effects, providing recoveries between 98% and 102%. The accuracy of the developed method was evaluated by the analysis of spiked certified reference materials. The developed method was successfully applied to gallium and indium determination in urine and lake water with satisfactory results.
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