Department of Chemistry, Faculty of Sciences, Yazd University, Safaeieh, Yazd 89195-741, Iran.
Talanta. 2010 Jun 30;82(1):208-12. doi: 10.1016/j.talanta.2010.04.020. Epub 2010 Apr 20.
A novel dispersive liquid-liquid microextraction based on solidification of floating organic drop (DLLME-SFO) for separation/preconcentration of ultra trace amount of vanadium and its determination with the electrothermal atomic absorption spectrometry (ETAAS) was developed. The DLLME-SFO behavior of vanadium (V) using N-benzoyl-N-phenylhydroxylamine (BPHA) as complexing agent was systematically investigated. The factors influencing the complex formation and extraction by DLLME-SFO method were optimized. Under the optimized conditions: 100 microL, 200 microL and 25 mL of extraction solvent (1-undecanol), disperser solvent (acetone) and sample volume, respectively, an enrichment factor of 184, a detection limit (based on 3S(b)/m) of 7 ng L(-1) and a relative standard deviation of 4.6% (at 500 ng L(-1)) were obtained. The calibration graph using the preconcentration system for vanadium was linear from 20 to 1000 ng L(-1) with a correlation coefficient of 0.9996. The method was successfully applied for the determination of vanadium in water and parsley.
基于悬浮液固化分散液相微萃取（DLLME-SFO）的新型分散液相微萃取，用于分离/预浓缩痕量钒及其用电感耦合等离子体原子吸收光谱法（ETAAS）测定。系统研究了钒（V）与 N-苯甲酰基-N-苯基羟胺（BPHA）作为络合剂的 DLLME-SFO 行为。优化了影响络合和萃取的因素。在最佳条件下：萃取溶剂（十一醇）、分散剂（丙酮）和样品体积分别为 100 μL、200 μL 和 25 mL，富集因子为 184，检测限（基于 3S(b)/m）为 7 ng L(-1)，相对标准偏差为 4.6%（500 ng L(-1)）。钒的预浓缩系统的校准曲线在 20 至 1000 ng L(-1)范围内呈线性，相关系数为 0.9996。该方法成功应用于水样和欧芹中钒的测定。
