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| Polydopamine Modified Titanium Dioxide Nano/Submicro Particles Coating for Solid Phase Microextraction of Phthalic Acid Esters |
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| DOI： |
| KeyWord:polydopamine electrophoretic deposition titanium dioxide nano/submicro particles solid phase microextraction high performance liquid chromatography phthalic acid esters |
| Author | Institution |
| WANG Hui-ju，SHEN Xiao-yan，LI Kang，WANG Shou-jia，MA Yu-long |
1. College of Chemistry and Chemical Engineering，Qinghai Minzu University，Xining ，China; 2. Key Lab of Resource Chemistry＆Eco-environmental Protection in Qinghai－Tibet Plateau， State Ethnic Affairs Committee，Qinghai Minzu University，Xining ，China |
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| Abstract: |
| A new polydopamine modified titanium dioxide nano/submicro particles coating（PDA@TiO2NPs） was fabricated on the NiTi alloy wire by electrophoretic deposition and self-polymerization modification in this paper．Prior to electrophoretic deposition，the titanium and nickel oxide composite nanoflakes（TiO2NiOCNFs） were in situ grown on NiTi alloy wire via hydrothermal treatment in order to boost the binding strength between TiO2NPs coating and NiTi fiber. Coupled with high performance liquid chromatography（HPLC），the fabricated PDA@TiO2NPs@TiO2NiOCNFs@NiTi fiber was applied as a solid phase microextraction（SPME） fiber to the determination of 5 phthalic acid esters（PAEs） in water samples．The main parameters affecting extraction efficiency such as extraction temperature，extraction time，stirring rate and ion strength were investigated and optimized．Under the optimized conditions，the analytical parameters including linear ranges，recoveries，limits of detection（LODs） and limits of quantitation（LOQs） were investigated and evaluated by external standard method．The results showed that the proposed method showed good linearity in the range of 0.1－200 μg/L，with correlation coefficients（r） not less than 0.998 9．LODs and LOQs were in the range of 0.013－0.055 μg/L and 0.043－0.18 μg/L，respectively．The intra-day and inter-day relative standard deviations（RSDs） for each fiber ranged from 5.4% to 6.8% and 5.7% to 7.0%，respectively．Moreover，the developed method was successfully used to extract and detect trace PAEs in real water samples．The spiked recoveries for target PAEs in real water samples ranged from 87.8% to 102%，with RSDs not more than 8.2%．In addition，the established method has high sensitivity，good accuracy，which was suitable for the high efficient detection of PAEs in different environmental water samples. |
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