Citation: DU Jia-Jian, ZHANG Min, ZHEN Qi, WANG Xue-Mei, DU Xin-Zhen, LU Xiao-Quan. Controllable Growth of Nanoporous Metal Oxide Composites on Nickel-Titanium Alloy Fibers for Selective Solid-Phase Microextraction of Polycyclic Aromatic Hydrocarbons[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(11): 1662-1668. doi: 10.11895/j.issn.0253-3820.171038 shu

Controllable Growth of Nanoporous Metal Oxide Composites on Nickel-Titanium Alloy Fibers for Selective Solid-Phase Microextraction of Polycyclic Aromatic Hydrocarbons

DU Jia-Jian ^1, ,
ZHANG Min ¹ ,
ZHEN Qi ¹ ,
WANG Xue-Mei ^1,2 ,
DU Xin-Zhen ^1,2 ,
LU Xiao-Quan ^1,2

1.
College of Chemistry and Chemical Engineering, Northwest Normal University;
2.
Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu, Lanzhou 730070, China

Received Date: 27 June 2017
Revised Date: 8 September 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (No.21265019).

Hydrothermal oxidation was used to prepare a nickel-titanium alloy (NiTi) solid-phase microextraction fiber. The experimental results demonstrated that a nanoporous NiTi oxide composite coating was in situ grown on the surface of NiTi substrate by direct oxidation in aqueous H₂O₂ solution at 80℃. The resulting composite oxide coating included more nickel and less titanium. The prepared NiTi fiber with Ni-rich oxide coating was used to extract typical aromatic compounds coupled with HPLC-UV and exhibited good extraction selectivity for polycyclic aromatic hydrocarbons (PAHs). The key factors affecting extraction efficiency of PAHs were examined. Under the optimized conditions, the calibration curves were linear in the range from 0.05 to 500 ng/mL with correlation coefficients ≥ 0.999, and the limits of detection were 0.026-0.056 ng/mL. Furthermore, the relative standard deviations (RSDs) for intra-day and inter-day repeatability of the single fiber varied from 4.8% to 6.2% and from 5.4% to 6.5% for five replicates of PAHs at the spiking level of 50 ng/mL, respectively. The RSDs for the fiber-to-fiber reproducibility of five fibers prepared in different batches ranged from 6.4% to 8.4%. This method was suitable for selective enrichment and detection of target PAHs in environmental water samples with relative recoveries of 87.4%-108.2% and RSDs<8.1%. Moreover, this novel NiTi fiber was mechanically strong and chemically stable, and its preparation was precisely controllable.
- Nanoporous titanium dioxide,
- Nickel-titanium alloy fiber,
- Solid-phase microextraction,
- Polycyclic aromatic hydrocarbons
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