title: Rapid in situ growth of oriented titanium-nickel oxide composite nanotubes arrays coated on a nitinol wire as a solid-phase microextraction fiber coupled to HPLC-UV.
abstract: An oriented titanium-nickel oxide composite nanotubes coating was in situ grown on a nitinol wire by direct electrochemical anodization in ethylene glycol with ammonium fluoride and water for the first time. The morphology and composition of the resulting coating showed that the anodized nitinol wire provided a titania-rich coating. The titanium-nickel oxide composite nanotubes coated fiber was used for solid-phase microextraction of different aromatic compounds coupled to high-performance liquid chromatography with UV detection. The titanium-nickel oxide composite nanotubes coating exhibited high extraction capability, good selectivity, and rapid mass transfer for weakly polar UV filters. Thereafter the important parameters affecting extraction efficiency were investigated for solid-phase microextraction of UV filters. Under the optimized conditions, the calibration curves were linear in the range of 0.1-300 μg/L for target UV filters with limits of detection of 0.019-0.082 μg/L. The intraday and interday precision of the proposed method with the single fiber were 5.3-7.2 and 5.9-7.9%, respectively, and the fiber-to-fiber reproducibility ranged from 6.3 to 8.9% for four fibers fabricated in different batches. Finally, its applicability was evaluated by the extraction and determination of target UV filters in environmental water samples.
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhen
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China.
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China.
authors.forename: Wenlan
authors.initials: W
authors.lastname: Song
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China.
authors.forename: Huiju
authors.initials: H
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China.|Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu, Lanzhou, China.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China. duxz@nwnu.edu.cn.|Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu, Lanzhou, China. duxz@nwnu.edu.cn.
authors.forename: Xinzhen
authors.initials: X
authors.lastname: Du
keywords: Anodization; Aromatic compounds; Nanotubes; Nitinol; Solid-phase microextraction