Use of Benzoylthiourea Immobilized on Silica Gel for Separation and Preconcentration of Uranium(VI)

Autor:	Cem Gok, Melek Merdivan, Serap Seyhan
Rok vydání:	2006
Předmět:	Detection limit Chromatography medicine.diagnostic_test Stripping (chemistry) Chemistry Silica gel Extraction (chemistry) chemistry.chemical_element Sorption Uranium Analytical Chemistry chemistry.chemical_compound Adsorption Spectrophotometry medicine Nuclear chemistry
Zdroj:	Microchimica Acta. 154:109-114
ISSN:	1436-5073 0026-3672
DOI:	10.1007/s00604-005-0478-5
Popis:	Benzoylthiourea immobilized on silica gel was prepared by two-step post-synthesis modification. The capacity of the chelating silica gel, which was characterized by FTIR, was 3.21 mmol center dot g(-1). The separation and enrichment of uranium(VI) from solutions was investigated. Effective extraction conditions were optimized in both batch and column methods prior to determination by spectrophotometry using arsenazo(III). The optimum pH range for quantitative adsorption is 4-7. Quantitative recovery of U(VI) was achieved by stripping with 0.1 mol center dot L-1 HCl. The sorption capacity of modified silica gel was 0.85 mmol center dot g(-1) uranium(VI). Recovery of U(VI) was 99.1 +/- 2.3% with a detection limit of 2 mu g center dot L-1. The preconcentration factor was 250, and the relative standard deviation was 1.53% for a 1 mu g center dot L-1 U(VI) solution. The method was used for the determination of uranium in synthetic samples and a soil sample.
Databáze:	OpenAIRE
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