title: Preconcentration of Zn2+ and Cu2+ ions from food and vegetable samples using modified activated carbon.
abstract: In this work, two N/S-containing chelating agents 2-(4-methoxybenzylideneamino)thiophenol (2-4-MBAT) and 2-(4-chlorobenzylideneamino) benzenethiol (2-4-CBABT) were synthesized as new sorbents and were used for preconcentration of Zn(2+) and Cu(2+) ions in food and vegetable samples. In the proposed procedure, the trace amount of Zn(2+) and Cu(2+) ions from 250 mL of sample solution at pH = 5.0 was preconcentrated by 1 g of activated carbon (AC) loaded with 15 mg of 2-4-MBAT and 2-4-CBABT separately. The breakthrough volumes (maximum sample volume that their metal ions quantitatively can be enriched) for solid-phase extraction (SPE) procedure based on the AC modified with 2-4-MBAT and 2-4-CBABT were 800 and 750 mL, respectively. The sorbed Zn(2+) and Cu(2+) ions were efficiently eluted by 8 mL of 4 mol L(-1) HNO(3) and preconcentration factor of 112.5 and 93.7 and experimental enhancement factor of 30 and 35 ions were obtained for Zn(2+) and Cu(2+), respectively. The application of this enrichment procedure allowed the extraction of trace metal ions with recoveries exceeding of 90%.
authors: Department of Chemistry, Yasouj University, Yasouj 75914-35, Iran. m_ghaedi@yahoo.com
authors: M
authors: M
authors: Ghaedi
authors: H
authors: H
authors: Tavallali
authors: M
authors: M
authors: Montazerozohori
authors: E
authors: E
authors: Zahedi
authors: M
authors: M
authors: Amirineko
authors: S
authors: S
authors: Khodadoust
authors: G
authors: G
authors: Karimipour
mesh_terms: D002606:Charcoal / Q000737:chemistry*; D002614:Chelating Agents / Q000737:chemistry; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D052616:Solid Phase Extraction; D014675:Vegetables / Q000737:chemistry*; D015032:Zinc / Q000032:analysis* / Q000737:chemistry
chemical_list: D002614:Chelating Agents; D012989:Soil Pollutants; D002606:Charcoal; D003300:Copper; D015032:Zinc