Department of Marine Living Resources, Iranian National Institute for Oceanography, Tehran, Iran.
Anal Chim Acta. 2011 Jan 10;683(2):206-11. doi: 10.1016/j.aca.2010.10.031. Epub 2010 Oct 31.
This work is a first study on extraction efficiency and thermal stability of nano-structured self-doped polyaniline (SPAN) as a coating of solid-phase microextraction (SPME) fibers. SPAN-based fibers were prepared using electrochemical deposition on platinum wires. The particle sizes of prepared nano-structure were in the range of 50-100 nm. Extraction properties of the fiber to 1,4-dioxane were examined using headspace solid-phase microextraction (HS-SPME) coupled to gas chromatography-flame ionization detection (GC-FID). The results have proved higher thermal stability of the proposed fiber compared to common PANI fiber. The SPAN coating was proved to be very stable at relatively high temperatures (up to 350 °C) with high extraction capacity and long lifespan (more than 50 times). Therefore, it can be a good substitute of polyaniline (PANI) as a SPME coating. The extraction procedure was optimized by selecting the appropriate extraction parameters including extraction time, extraction temperature, salt concentration, stirring rate and headspace volume. Calibration graph was linear in the concentration range of 1-100 ng mL(-1) (R(2)>0.993) with detection limit of 0.1 ng mL(-1). Single fiber and fiber-to-fiber repeatability were lower than 6.0% and 10.4%, respectively. Different water samples were analyzed as real samples and good recoveries (98-120%) were obtained.
这是首次研究纳米结构自掺杂聚苯胺（SPAN）作为固相微萃取（SPME）纤维涂层的萃取效率和热稳定性。SPAN 基纤维是通过在铂丝上电沉积制备的。所制备的纳米结构的粒径范围在 50-100nm 之间。采用顶空固相微萃取（HS-SPME）与气相色谱-火焰离子化检测（GC-FID）联用，考察了纤维对 1,4-二恶烷的萃取性能。结果表明，与普通 PANI 纤维相比，所提出的纤维具有更高的热稳定性。SPAN 涂层在相对较高的温度（高达 350°C）下非常稳定，具有较高的萃取容量和较长的寿命（超过 50 次）。因此，它可以作为 SPME 涂层的聚苯胺（PANI）的良好替代品。通过选择适当的萃取参数，包括萃取时间、萃取温度、盐浓度、搅拌速度和顶空体积，对萃取程序进行了优化。校准曲线在 1-100ngmL(-1)浓度范围内呈线性（R(2)>0.993），检测限为 0.1ngmL(-1)。单纤维和纤维间重复性均低于 6.0%和 10.4%。对不同的水样进行了分析作为实际样品，得到了良好的回收率（98-120%）。
