A magnetic multifunctional dendrimeric coating on a steel fiber for solid phase microextraction of chlorophenols

A polyamidoamine dendrimer was synthesized, placed on magnetite nanoparticles, and the resulting material was then employed as a fiber coating for use in solid phase microextraction of chlorophenols. The polyamidoamine was expected to be an efficient extracting medium due to the presence of multipolar groups and its inner porosity. A thin stainless steel wire was coated with the dendritic polyamidoamine polymer via electrolysis and chemical reactions. The coated fiber was investigated in terms of headspace solid phase microextraction of chlorophenols from aqueous samples followed by GC-MS quantitation. The calibration plots are linear in the 2-1000 ngai...L-1 chlorophenol concentration ranges. The LOD values (for an S/N ratio of 3) are between 0.6 and 10 ngai...L-1. The relative standard deviations (RSDs) for spiked distilled water samples (for n = 3) are < 7% at a level of 100 ngai...L-1. The RSDs for fiber to fiber variations at the same concentration are < 9%. The method was applied to spiked tap water, well water and Caspian Sea water samples. Relative recoveries are between 80 and 97%. The method shows good repeatability, sensitivity, long operational lifetime, and the fibers are physically stable.