Sodium dodecyl sulfate coated γ-alumina support modified by a new schiff base for solid phase extraction and flame-aas determination of lead and copper ions

摘要

A simple and fast approach for solid phase extraction is herein described, and used to determine trace amounts of Pb~(2+) and Cu~(2+) metal ions. The solid phase support is sodium dodecyl sulfate (SDS)-coated γ-alumina modified with bis(2-hydroxy acetophenone)-1,6-hexanediimine (BHAH) ligand. The adsorbed ions were stripped from the solid phase by 6 mL of 4 M nitric acid as eluent. The eluting solution was analyzed by flame atomic absorption spectrometry (FAAS). The sorption recovery of metal ions was investigated with regard to the effects of_pH, amount of ligand, γ-alumina and surfactant and the amount and type of eluent. Complexation of BHAH with Pb~(2+) or Cu~(2+) ions was examined via spectrophotometry using the HypSpec program. The detection limit for Cu~(2+) was 7.9 μg L~(-1) with a relative standard deviation of 1.67%, while that for Pb~(2+) was 6.4 μg L~(-1) with a relative standard deviation of 1.64%. A preconcentration factor of 100 was achieved for these ions. The method was successfully applied to determine analyte concentrations in samples of liver, parsley, cabbage, and water.