Ghaedi M, Ahmadi F, Tavakoli Z, Montazerozohori M, Khanmohammadi A, Soylak M
Chemistry Department, University of Yasouj, Yasouj 75914-353, Iran.
J Hazard Mater. 2008 Apr 15;152(3):1248-55. doi: 10.1016/j.jhazmat.2007.07.108. Epub 2007 Aug 6.
In the presented work, 5,5-diphenylimidazolidine-2,4-dione (phenytoin) (DFTD), 5,5-diphenylimidazolidine-2-thione-,4-one (thiophenytoin) (DFID) and 2-(4'-methoxy-benzylidenimine) thiophenole (MBIP) modified activated carbons have been used for the solid phase extraction of copper and lead ions prior to their flame atomic absorption spectrometric determinations. The influences of the various analytical parameters including pH, amounts of reagent, sample volume and eluent type, etc. on the recovery efficiencies of copper and lead ions were investigated. The influences of alkaline, earth alkaline and some transition metals on the adsorption of the analytes were also examined. The detection limits by three sigma for analyte ions were 0.65 and 0.42 microg L(-1) using activated carbon modified with DFID; 0.52 and 0.37 microg L(-1) using activated carbon modified with DFTD and 0.46 and 0.31 microg L(-1) using activated carbon modified with MBIP for Pb(II) and Cu(II), respectively. The procedure was applied to the determination of analytes in natural waters, soil, and blood samples with satisfactory results (recoveries greater than 95%, R.S.D.'s lower than 4%).
在本研究中，5,5 - 二苯基咪唑烷 - 2,4 - 二酮（苯妥英）（DFTD）、5,5 - 二苯基咪唑烷 - 2 - 硫酮 - 4 - 酮（硫代苯妥英）（DFID）和2 -（4'-甲氧基 - 亚苄基胺）苯硫酚（MBIP）修饰的活性炭已用于在火焰原子吸收光谱法测定铜和铅离子之前的固相萃取。研究了包括pH值、试剂用量、样品体积和洗脱剂类型等各种分析参数对铜和铅离子回收效率的影响。还考察了碱金属、碱土金属和一些过渡金属对分析物吸附的影响。使用DFID修饰的活性炭对分析物离子的三倍标准偏差检测限分别为：铅（II）为0.65 μg L⁻¹，铜（II）为0.42 μg L⁻¹；使用DFTD修饰的活性炭时，铅（II）为0.52 μg L⁻¹，铜（II）为0.37 μg L⁻¹；使用MBIP修饰的活性炭时，铅（II）为0.46 μg L⁻¹，铜（II）为0.31 μg L⁻¹。该方法应用于天然水、土壤和血液样品中分析物的测定，结果令人满意（回收率大于95%，相对标准偏差低于4%）。
