Modulating the selectivity of solid-phase microextraction fibers based on morphological, compositional, and size-depende
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ORIGINAL PAPER
Modulating the selectivity of solid-phase microextraction fibers based on morphological, compositional, and size-depended control of bimetallic oxide nanostructures grown on nickel-titanium alloy substrates Yu Liu 1 & Chanchan An 1 & Rong Zhang 1 & Junliang Du 1 & Xuemei Wang 1 & Xinzhen Du 1,2 Received: 23 April 2020 / Accepted: 4 August 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Nickel-titanium oxide nanotubes (NiTiONTs), nanoparticles, and nanopores were in situ grown on NiTi fiber substrates by controlling anodization parameters. The adsorption performance of different bimetallic oxide nanostructures was evaluated using typical aromatic compounds including chlorophenols, phthalic acid esters, ultraviolet filters (UVFs), and polycyclic aromatic hydrocarbons (PAHs) coupled to HPLC-UV. The results clearly indicate that these NiTiO nanostructures show good extraction capability for UVFs and PAHs. The extraction performance of UVFs and PAHs greatly depends on the surface morphologies and sizes of the grown NiTiO nanostructures along with their elemental compositions. Compared with NiTiO nanoparticle and nanopore coatings, the longer well-aligned NiTiONT coating exhibits better extraction capability and selectivity for PAHs than for UVFs. Therefore, the extraction parameters of the NiTi@NiTiONT fiber for PAHs were investigated and optimized. Under optimized conditions, the proposed method was linear in the range 0.05–200 μg L−1 with correlation coefficients above 0.999. Limits of detection were between 0.008 and 0.124 μg L−1. Relative standard deviations (RSDs) of the intra-day and the inter-day analyses with the single fiber varied from 4.09 to 6.33%. RSDs for fiber-to-fiber reproducibility of the proposed method with five fibers prepared in different batches were between 5.75 and 7.43%. The applicability of the proposed method was investigated by the enrichment and determination of target PAHs in environmental water samples and relative recoveries of 84.5 ± 6.5 – 116 ± 7.8% were achieved. Notably, the prepared fiber was stable up to 250 times. Keywords Oxide nanotubes . Nitinol wire . Polycyclic aromatic hydrocarbons . Sample preparation
Introduction Solid-phase microextraction (SPME) was presented in the miniaturized format of solid-phase extraction for the first time by Pawliszyn and co-workers in the early 1990s [1]. This technique integrates sampling, extraction, concentration, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04481-7) contains supplementary material, which is available to authorized users. * Xinzhen Du [email protected] 1
College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
2
Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu, Lanzhou 730070, China
cleanup, and sample introduction into a single solvent-free step [2]. SPME is based on the absorption or adsorption of organic analytes into or onto a stationary phase coated wi
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