Self-assembled Gold Nanoparticles Coating for Solid-Phase Microextraction of Ultraviolet Filters in Environmental Water

Self-assembled gold nanoparticles (AuNPs) coating was performed using an etched stainless steel wire as a support for solid-phase microextraction (SPME) of ultraviolet (UV) filters in environmental water coupled to HPLC. The highest extraction efficiencies were achieved within 30 min at 55 °C and pH 7 with stirring rate of 800 rpm. Under the optimized conditions, the calibration graphs of the UV filters (BP-3, OD-PABA, EHMC and EHS) were linear in the range of 0.004–200 μg L−1. The limits of detection of the method were 0.43–570 ng L−1 (S/N = 3). The relative standard deviation (RSD) of AuNPs-SPME-HPLC was 1.91%–4.20% (n = 5) for spiked water of 20 μg L−1 each UV filter. In the case of real water samples, the obtained recoveries were between 77.9% and 108% with RSD of 3.12%–8.04%.

A robust self-assembled gold nanoparticles (AuNPs) coating was developed by chemical position on the etched SS wire via Au-S bonding of octanedithiol. This new fiber exhibits high stability and excellent extraction capability. Moreover, it was successfully applied to the concentration and determination of target UV filters from environmental water samples.Figure optionsDownload as PowerPoint slide