Use of benzoylthiourea immobilized on silica gel for separation and preconcentration of uranium(VI)

MERDİVAN M., Seyhan S., Gok C.

MICROCHIMICA ACTA, cilt.154, ss.109-114, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 154
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1007/s00604-005-0478-5
  • Dergi Adı: MICROCHIMICA ACTA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.109-114
  • Anahtar Kelimeler: benzoylthiourea, silica gel, preconcentration, uranium(VI), PHASE EXTRACTIVE PRECONCENTRATION, SORPTION BEHAVIOR, CHELATING RESIN, ACIDIC MEDIA, RARE-EARTHS, THORIUM(IV), LANTHANUM(III), ADSORPTION, ENRICHMENT, PALLADIUM
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

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.