JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Xiaolan Wang,Xufeng Meng,Qiuhua Wu,Chun Wang,Zhi Wang
A solid phase extraction (SPE) method with a porous organic polymer as adsorbent was established for the extraction of five carbamate pesticides (metolcarb, carbaryl, isoprocarb, bassa and diethofencarb) from milk, white wine and juice samples prior to high performance liquid chromatography-diode array detection. The main factors affecting the SPE were optimized, including sample volume, sample loading rate, sample solution pH, desorption conditions and cartridge reusability. Under the optimal conditions, a good linearity existed in the range from 1.0 to 320.0 ng mL −1 for milk and white wine samples and from 0.5 to 160.0 ng mL −1 for juice sample with the correlation coefficients between 0.9956 and 0.9998. The method recoveries of the carbamates were 82.0%–110.0%. The limits of detection were 0.12-0.40 ng mL -1 for milk and white wine samples, and 0.06-0.20 ng mL −1 for juice sample. The adsorption mechanism of the adsorbent was investigated by the extraction of different types of organic compounds (carbamates, benzoylurea insecticides, endocrine disrupting chemicals and polycyclic aromatic hydrocarbons) with the adsorbent. The results showed that the existence of the hydrogen-bonding between the adsorbent and the analytes is favorable for the adsorption and strong hydrophobicity seems to have an adverse effect.
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高影响因子
WATER AIR AND SOIL POLLUTION
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2019
·Vol. 230
·期 6
·1-12
·
IF 1.774
Yang Min,Ke Junfeng,Zhang Qiwu,He Xiaoman
Surfactants are considered promising and practical substances for enhancing polycyclic aromatic hydrocarbon (PAHs) removal from contaminated soil. In order to explore the effects of single and mixed surfactants on the removal of high-concentration PAHs from soil, a series of experiments have been conducted. In this study, Tween80-saponin (a mixed surfactant), Tween80 (a nonionic surfactant), and saponin (a biosurfactant) were used to remove two typical and high concentration PAHs (anthracene and pyrene) from contaminated soil. Results showed that the mixed surfactant had better performance on the solubilization of anthracene and pyrene than Tween80, but its performance was worse than saponin. When the proportion and concentration of the mixed surfactant were 1:9 and 800 mg L −1 respectively, the elution rate of anthracene could reach 97.67%, it was better than that by Tween80 and saponin. In addition, the Tween80-saponin mixed surfactant had good performance on actual PAHs contaminated soil remediation. When the proportion and concentration of Tween80-saponin were 1:9 and 800 mg L −1 respectively, the PAHs elution rate of actual contaminated soil could reach 81.31%.
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JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Ning Zhang,Lishen Su,Suning Man,Xiaoyun Lei,Ting Huang,Chunling Zhu,Lan Zhang,Xiaoping Wu
A direct immersion solid-phase microextraction (DI-SPME) approach for gas chromatography-mass spectrometry (GC–MS) based on hybrid fiber coating of ionic liquid and polyhedral oligomeric silsesquioxane (POSS) is presented. To fabricate the task-specific coating for the enrichment of polycyclic aromatic hydrocarbons (PAHs), 1-butyl-3-vinylimidazolium bis[(trifluoromethyl)sulfonyl]imide (IL) and POSS were rapidly photoinitiated copolymerized within 5 min on a stainless steel fiber. The high efficient extraction of target analytes can be attributed to a combined result of multiple interactions including the strong C F⋯H C pseudohydrogen bonding, π-π stacking, hydrophobic force, and molecular sieve effect. A wide linear range (0.04–400 ng L −1 ) with low detection limits in the range of 0.004 and 0.5 ng L −1 were obtained for PAHs by GC–MS. The applicability of this coupling method was successfully demonstrated by the analysis of trace PAHs in real river water and soil samples, with satisfied recoveries (84.2–108.6%) and relative standard deviations (<8.1%). Compared to the other commercial fiber-based SPME methods, the IL/POSS hybrid coating-based SPME is much cheaper, thermally stable and capable of eliminating possible deleterious effects as well.
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JOURNAL OF SEPARATION SCIENCE
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2019
·Vol. 43
·期 3
·622-630
·
IF 2.516
Chunying Li,Min Sun,Xiangping Ji,Sen Han,Jiaqing Feng,Wenjuan Guo,Juanjuan Feng
Triazine-based organic polymers@SiO 2 nanospheres were prepared and applied as an extraction coating onto stainless steel wires and the wires were filled into polyetheretherketone tube for in-tube solid-phase microextraction. Taking polycyclic aromatic hydrocarbons as targets, main factors affecting extraction performance of the tube were investigated through coupling to high performance liquid chromatography. Under the optimum conditions, an online analytical method for polycyclic aromatic hydrocarbons was established with large linear ranges (0.010-20 µg/L), low limits of detection (0.003-0.010 µg/L), high enrichment factors (533-2954), and good repeatability (relative standard deviations <1.7% for intraday test, <5.0% for interday test). The analysis method was successfully applied to the detection of trace targets in real water samples and the relative recoveries ranged from 82.9 to 119.9%, which demonstrated the applicability of extraction tube in sample preparation.
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高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Zhihong Shi,Jing Jiang,Weiyue Pang,Hongyu Ma,Xiaoxue Chu,Can Zhou,Hongyi Zhang
In this study, carbon fibers (CFs) were used as sorbent material for the dispersive micro-solid phase extraction (d-μSPE) of anthracene , acenaphthene and phenanthrene from tea infusion samples prior to gas chromatography-quadrupole mass spectrometric detection. CFs were obtained by carbonizing cotton at 800 °C under the protection of nitrogen for 4 h. After characterization by the scanning electron microscopy-energy dispersive spectrometry, X-ray diffraction and N 2 adsorption-desorption, 20 mg of CFs were used to effectively adsorb PAHs in 5 min from 10 mL of tea infusion samples, 2 mL of toluene was used as desorbent . Under the optimum conditions, good linearity was obtained with R 2 between 0.9996 and 0.9998. The limits of detection were in the range of 0.012–0.014 μg/L. RSD values for intra- and inter-day precision were ≤6.7% and ≤7.8%, respectively. In this work, cotton based CFs were prepared in a solventless and green way and the CFs based d-μSPE procedure was simple, rapid and cost-effective, with no need of column-packing. The proposed method has been successfully applied to the analysis of PAHs in three kinds of tea infusion samples.
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CELLULOSE
·
2019
·Vol. 26
·期 16
·8829-8841
·
IF 3.917
Huang Hongye,Liu Meiying,Chen Junyu,Mao Liucheng,Wan Qing,Wen Yuanqing,Deng Fengjie,Zhou Naigen,Zhang Xiaoyong,Wei Yen
Abstract Since the first discovery by Tang in 2001, aggregation-induced emission (AIE) phenomenon has attracted considerable research interest in various fields. In this contribution, AIE-active composites (named as An-HPG-β-CD) have been fabricated via conjugation of AIE-active compound An-B(OH) 2 and hyperbranched polyglycerol functionalized β cyclodextrin (HPG-β-CD) based on dynamic phenyl borate for the first time. The potential biomedical applications of these AIE-active composites for biological imaging and drug delivery applications were further explored. The successful preparation of An-HPG-β-CD composites was confirmed through a series of characterization techniques. The An-HPG-β-CD composites possess great water dispersibility, low cytotoxicity, excellent fluorescence properties and uniform size and morphology, which make them promising for cell imaging. Furthermore, the cavities of An-HPG-β-CD composites could be utilized for loading with doxorubicin for drug delivery applications. In conclusion, we have developed a novel method for fabrication of AIE-active An-HPG-β-CD composites through formation of dynamic phenylboronic borate between β cyclodextrin containing hyperbranched polyglycerol and phenylboronic containing AIE dye. These AIE-active composites are of great potential in biological imaging and drug delivery applications. Graphic abstract
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2241-2255
·
IF 2.993
Ma Jing,He Yi,Shi Heng,Fan Yi,Yu Hao,Li Yubin
Graphene oxide (GO) membranes have great potential in separation technology. However, their instability under aqueous environments hinders their separation performance and practical application. Herein, we present a facile and environmentally friendly method to fabricate stable GO-based membranes via the intercalation of montmorillonite (MMT) nanoplatelets. The as-prepared membranes remain stable under water (neutral, acidic, and alkaline) in a fully hydrated state and exhibit a high pure-water flux up to 139.5 L·m −2 ·h −1 under 0.09 MPa. Furthermore, they also show high organic molecule rejection (98.75% for Congo red, 99.44% for rhodamine B, 99.90% for crystal violet, 99.94% for methylene blue, 96.26% for phenanthracene, and 51.32% for phenol) as well as good removal rate of heavy metal ions (100% for Ag(I), 100% for Cu(II), and 27.04% for Cr(VI)). Moreover, an outstanding recycling ability of the membranes also has been obtained. These significant performances make our membranes a good candidate in water purification.
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Analytical Methods
·
2018
·Vol. 10
·期 46
·5516-5523
·
IF 2.073
Qing Wang,Jiaxin Lian,Zhongdan Hua,Ying Yang,Ying Li,Xiuwen Hao,Yaxin Cao,Xianqi Zeng
A novel magnetic solid-phase extraction (MSPE) sorbent, magnetic multiwalled carbon nanotube-octadecylphosphonic acid modified zirconia (mMWCNT–ZrO2–C18) composite, was fabricated via a simple solvothermal reduction method to extract polycyclic aromatic hydrocarbons (PAHs) from edible oils, coupling with high performance liquid chromatography analysis. The hydrophobic ZrO2–C18 nanoparticles were introduced to enhance the extraction capability. Factors influencing the extraction efficiency, i.e. the type and volume of desorption solvent, amount of the sorbent, and adsorption and desorption time, were systematically investigated. Under the optimal conditions, calibration curves were linear (R2 > 0.9937) over the concentration range from 0.20 to 200 ng g−1. The limits of detection (S/N = 3) and limits of quantification (S/N = 10) achieved were in the range of 0.06–0.55 and 0.20–1.83 ng g−1, respectively. The intra- and inter-day relative standard deviations were less than 7.21%. A comparative study indicated that higher recoveries were obtained by using mMWCNT–ZrO2–C18 compared to when using bare mMWCNTs. The results indicated that the mMWCNT–ZrO2–C18 nanomaterial was endowed with great adsorption capability and had significant potential in the preconcentration of PAHs from edible oil samples.
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Analytical Methods
·
2018
·Vol. 10
·期 41
·5014-5024
·
IF 2.073
Xuexiang Shi,Ning Li,Di Wu,Na Hu,Jing Sun,Xuxia Zhou,Yourui Suo,Guoliang Li,Yongning Wu
A novel magnetic covalent organic framework (Fe3O4@COF(TpDA)) material possessing a large surface area and high and regular porosity was constructed via a facile strategy and applied as a magnetic solid phase extraction sorbent for the determination of trace polycyclic aromatic hydrocarbons in edible oil and grilled meats prior to high performance liquid chromatography with diode array detection. The obtained materials were characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption–desorption isotherms and vibrating sample magnetometry. The prepared Fe3O4@COF(TpDA) materials showed some attractive features including a large surface area (180.20 m2 g−1) and high saturation magnetization (62.28 emu g−1). The experimental parameters affecting the extraction performance including the type of eluent, amount of sorbent, and adsorption and desorption times were optimized. Under the optimized conditions, the adsorption equilibrium for polycyclic aromatic hydrocarbons could be achieved in only 10 min. The proposed method achieved low limits of detection (0.03–0.73 μg L−1 for LODs and 0.10–2.43 μg L−1 for LOQs) and good linearity (R ≥ 0.9937). The obtained materials were successfully applied to enrich polycyclic aromatic hydrocarbons in edible oil and grilled meats and showed good accuracy with recoveries in the range of 85.5–104.2%. Furthermore, the proposed method was also evaluated by different adsorption kinetic theories, and the pseudo-second-order model can explain the adsorption kinetics. The proposed method is facile, rapid, effective and selective for determination of PAHs in food samples.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-7
·
IF 5.705
Pang Yachao,Zang Xiaohuan,Wang Mengting,Chang Qingyun,Zhang Shuaihua,Wang Chun,Wang Zhi
A fibrous magnetic boron nitride nanocomposite was synthesized and is shown to be a viable adsorbent for the magnetic solid phase extraction of pesticides prior to their quantitation by gas chromatography with electron capture detection. The optimum conditions were obtained by both single factor optimization and response surface analysis (Box-Behnken design). Under the optimized conditions, the response to the ten pesticides (dicofol, α-endosulfan, p,p’ -DDE, nitrofen, β -endosulfan, p,p’ -DDD, p,p’ -DDT, bifenthrin, permethrin and fenvalerate) is linear in the 0.03–40 ng·mL −1 concentration range with the coefficients of determination ranging from 0.9970 to 0.9992. The relative standard deviations at concentration levels of 0.5 ng·mL −1 , 20 ng·mL −1 and 40 ng·mL −1 were below 8.7%. The recoveries of the analytes from spiked tea water and tea beverage samples varied between 84.5% and 122%, with relative standard deviations ranging from 4.8 to 12%. The limits of detection are between 0.01 and 0.05 ng·mL −1 . The adsorbent can be reused over 50 times without significant loss of extraction efficiency.
A novel fibrous-shape magnetic boron nitride nanocomposite (Fe 3 O 4 @ f -BN) was used as the adsorbent for the magnetic solid phase extraction (MSPE) of ten pesticides from tea water and tea beverage samples prior to their determination by gas chromatography (GC).
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2018
·
IF 3.412
Ning Li,Di Wu,Na Hu,Guangsen Fan,Xiuting Li,Jing Sun,Xuefeng Chen,Yourui Suo,Guoliang Li,Yongning Wu
The present study reported a facile, sensitive, and efficient method for enrichment and determination of trace polycyclic aromatic hydrocarbons (PAHs) in food samples by employing new core–shell nanostructure magnetic covalent organic framework hybrid microspheres (Fe3O4@COF-(TpBD)) as the sorbent followed by HPLC-DAD. Under mild synthetic conditions, the Fe3O4@COF-(TpBD) were prepared with the retention of colloidal nanosize, larger specific surface area, higher porosity, uniform morphology, and supermagnetism. The as-prepared materials showed an excellent adsorption ability for PAHs, and the enrichment efficiency of the Fe3O4@COF-(TpBD) could reach 99.95%. The obtained materials also had fast adsorption kinetics and realized adsorption equilibrium within 12 min. The eluent was further analyzed by HPLC-DAD, and good linearity was observed in the range of 1–100 ng/mL with the linear correlation being above 0.9990. The limits of detection (S/N = 3) and limits of quantitation (S/N = 10) for 15 PAHs were in the range of 0.83–11.7 ng/L and 2.76–39.0 ng/L, respectively. For the application, the obtained materials were employed for the enrichment of trace PAHs in food samples and exhibited superior enrichment capacity and excellent applicability.
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ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Shan Liu,Maochao Wei,Xiangli Zheng,Shuai Xu,Fangquan Xia,Changli Zhou
In the paper, a novel and sensitive electrochemical sensor based on modification of electroactive alizarin red S functionalized mesoporous silica material SBA15 onto glassy carbon electrode (ARS-SBA15/GCE) was developed. Alizarin red S , called electrochemical probe that can selectively recognize polycyclic aromatic hydrocarbons (PAHs), as tools for the detection of tricyclic aromatic hydrocarbon anthracene. The morphology and interface property of ARS modified SBA15 (ARS-SBA15) were examined by transmission electron microscopy (TEM) and fourier transform infrared spectroscopy (FTIR). Taking advantage of the π-π stacking force between alizarin red S and anthracene, the ARS-SBA15/GCE sensor could detect anthracene quantitatively in a wide range of 1.0 pM–10.0 nM and a low detection limit of 0.5 pM (S/N = 3). Other PAHs, such as naphthalene, phenanthrene, pyrene, and benzo[a]pyrene show little interference on the detection. Consequently, a simple and sensitive electrochemical method was proposed for the determination of anthracene, which can be used to determine anthracene in waste water samples. The electrochemical method provides a general tool that complements the commonly used spectroscopic methods and immune method for the detection of PAHs.
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