DETERMINATION OF TRACE AMOUNTS OF ZINC BY FLAME ATOMIC ABSORPTION SPECTROMETRY AFTER SEPARATION AND PRECONCENTRATION ONTO MODIFIED NATURAL ANALCIME ZEOLITE LOADED 2,3,5,6-TETRA(2-PYRIDYL)PYRAZINE

作者：Saljooghi A Shokooh^*; Fatemi S J; Afzali D

来源：Bulletin of the Chemical Society of Ethiopia, 2010, 24(1): 127-132.

• Zinc determination
• Solid-phase extraction
• Analcime zeolite
• Preconcentration
• 2,3,5,6-Tetra(2-pyridyl)pyrazine

Zinc ions were separated by solid phase extraction onto modified natural analcime zeolite loaded with 2,3,5,6-tetra(2-pyridyl)pyrazine (TPPZ). Extraction efficiency and the influence of sample matrix, flow rate, pH, and type and minimum amount of stripping eluent were investigated. Solutions of zinc ions were passed through a glass column packed with 1.0 g of the sorbent at pH range of 3.8-4.4. The adsorbed zinc ions were eluted with 5.0 mL of 2.0 M HNO(3) at a flow rate of 1.0 mL min(-1). The calibration curve using the preconcentration system was linear from 0.05 to 2.0 mu g mL(-1) in final solution with a correlation coefficient of 0.9991. The relative standard deviation (RSD) for eight replicate determinations at 0.5 mu g mL(-1) zinc was +/- 0.92%. Detection limit was 2.9 ng mL(-1) in final solution and preconcentration factor was 170. The proposed method was successfully applied to the determination of zinc in various standard and water samples.

• 出版日期2010-4