Single wall carbon nanotubes-oxide test strip for one-step solid phase extraction of simetryn and fast detection using surface enhanced Raman spectroscopy

Abstract

A novel technique combining solid-phase extraction and surface-enhanced Raman spectroscopy has been developed using a home-made test strip as the solid phase apparatus and detecting platform for surface-enhanced Raman spectroscopy. Single wall carbon nanotubes (SWCNTs) were functionalized with oxidizing acid and deposited on a filter membrane to fabricate the SWCNTs-oxide test strip for one-step solid-phase extraction. After spraying the surface of the SWCNTs-oxide test strip with gold colloids, surface-enhanced Raman scattering signals were greatly increased owing to the clean detection background of the matrix and the concentrated target molecules in the probed volume. A facile approach was recommended here to rapidly monitor simetryn residues in lake water samples using one-step solid-phase extraction with the SWCNTs-oxide test strip and subsequent direct detection on a portable Inspector Raman. The detection limit of this method was found to be 2 μg L⁻¹, and the recovery was between 70 and 80%. In addition, the linearity was in the range 10 to 300 μg L⁻¹ with a correlation coefficient of 0.9878. The method provides a promising approach for the fast analysis of triazine compounds in complex matrix samples.