NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 11
·8791-8799
·
IF 3.201
Huazi Wang,Chaoran Liu,Xiaodong Huang,Chendi Jia,Yang Cao,Lu Hu,Runhua Lu,Sanbing Zhang,Haixiang Gao,Wenfeng Zhou,Donghui Xu
In the present study, a convenient, low-cost, sensitive and environmentally friendly method for the determination of four benzoylurea insecticides (BUs) in water and tea beverage samples was developed. The alkalized luffa sponge fibers (AL) were modified by the ionic liquid 1-hexadecyl-3-methylimidazolium bromide ([C16MIM]Br) through physisorption and used as the sorbent of dispersive solid-phase extraction (DSPE). The sorbent was characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The retained analytes were eluted using 200 μL of methanol and then quantified by high performance liquid chromatography-ultraviolet detection (HPLC-UVD). The influences of extraction parameters of [C16MIM]Br-AL-DSPE on the BUs were thoroughly studied. Under the optimal conditions, good linearity was observed over the concentration range of 1–500 ng mL−1, with coefficients of determination greater than 0.99. The limits of detection (LODs) of the developed method were 0.14–0.21 ng mL−1 in water and 0.19–0.23 ng mL−1 in tea beverage samples. Satisfactory recoveries were achieved in the range of 72.8–89.3%, with relative standard deviations lower than 10%. Finally, the established [C16MIM]Br-AL-DSPE-HPLC-UVD method was successfully applied for the determination of BU residues in environmental water and tea beverage samples.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 41
·期 7
·1539-1547
·
IF 2.557
Xinyu Liang,Ruiyang Ma,Lin Hao,Chun Wang,Qiuhua Wu,Zhi Wang
In this work, a magnetic β-cyclodextrin polymer was successfully prepared and used as an adsorbent for the magnetic solid-phase extraction of six benzoylurea insecticides (diflubenzuron, triflumuron, hexaflumuron, teflubenzuron, flufenoxuron, and chlorfluazuron) from honey, tomato, and environmental water samples. The influence of the main experimental conditions on the extraction was studied. Under the optimized conditions, the β-cyclodextrin polymer@Fe 3 O 4 showed an excellent extraction performance for the benzoylurea insecticides. A good linearity was obtained for the analytes in the range of 3.0–800 ng/g for honey samples, 0.3–160 ng/g for tomato samples, and 0.1–80.0 ng/mL for water samples, with the correlation coefficients above 0.9998. Satisfactory repeatabilities were achieved, with the relative standard deviations less than 5.7%. The limits of detection (S/N = 3) of the method for the benzoylurea insecticides were 0.2–0.8 ng/g for honey samples, 0.04–0.10 ng/g for tomato samples, and 0.02–0.05 ng /mL for water samples. The method was successfully used for the determination of the six benzoylurea insecticides residues in honey, tomato, and environmental water samples with a satisfactory result.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 89
·56528-56536
·
IF 3.108
Miyi Yang,Kun Hong,Xiaoqiang Li,Fangji Ge,Yuqing Tang
An efficient and novel salt-assisted deep eutectic solvent (DES) dispersive liquid–liquid microextraction based on solidification of floating organic droplets combined with high performance liquid chromatography was developed for extraction and determination of four benzoylureas (BUs) in water samples. In this method, a hydrophobic deep eutectic solvent (DES) used as extractant was dissolved in a dispersive-demulsified solvent containing FeCl3. The influence of main factors on the efficiency of this procedure was investigated by one-factor experimental design and central composite design (CCD) successively. Under optimal conditions, the proposed method manifest good recoveries in the range of 82.36–93.82% and high precision (relative standard deviations below 5%). The enrichment factors for the analytes changed from 91 to 97. The limits of detection varied from 0.11 to 0.35 μg L−1 with the linear coefficients greater than 0.999. The method is successfully applied to determine the BUs in different water samples, which proved the potential use of this method in real samples.
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-8
·
IF 4.58
Song Yuhong,Ma Ruiyang,Jiao Caina,Hao Lin,Wang Chun,Wu Qiuhua,Wang Zhi
A magnetic mesoporous poly(melamine-formaldehyde) composite (Fe 3 O 4 -mPMF) was prepared via grafting poly(melamine-formaldehyde) onto the surface of amino-functionalized magnetite (Fe 3 O 4 ) nanoparticles. The material was characterized by scanning electron micrography, transmission electron microscopy, X-ray diffraction, Fourier transform-infrared spectroscopy, nitrogen adsorption-desorption isotherms, and thermogravimetric analysis. It has a large surface area, a typical mesoporous structure, and a high thermal stability. It was employed as a magnetic sorbent for the solid phase extraction of the following endocrine disrupting chemicals (EDCs): Bisphenol A, 4-tert-butylphenol, 4-tert-octylphenol and nonylphenol. The EDCs were then quantified by HPLC. Under the optimized conditions, the response to the EDCs is linear in the range of 0.5–100 ng·mL −1 , and the limits of detection are 0.02–0.1 ng·mL −1 . The high adsorption capability of the Fe 3 O 4 -mPMF is mainly attributed to multiple interactions including π-stacking, hydrogen bonding, and hydrophobic interactions. The method was applied to the extraction of EDCs from spiked river water and bottled juice samples. The results demonstrated that the Fe 3 O 4 -mPMF is an efficient adsorbent for the extraction of organic compounds with large conjugated π-system, plenty of hydrogen-bonding sites, and strong hydrophobicity.
A magnetic mesoporous polymelamine-formaldehyde composite (Fe 3 O 4 -mPMF) was prepared and employed as a magnetic sorbent for the solid phase extraction of endocrine disrupting chemicals from river water and bottled juice samples prior to high-performance liquid chromatographic analysis.
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高影响因子
TALANTA
·
2012
·
IF 3.794
Jiaheng Zhang,Zhe Liang,Songqing Li,Yubo Li,Bing Peng,Wenfeng Zhou,Haixiang Gao
A novel microextraction technique, named in-situ metathesis reaction , combined with ultrasound-assisted ionic liquid dispersive liquid–liquid microextraction was developed for the determination of five phenylurea pesticides (i.e., diuron , diflubenzuron , teflubenzuron, flufenoxuron , and chlorfluazuron) in environmental water samples. In the developed method, 360 μL LiNTf 2 aqueous solution (0.162 g/mL) was added to the sample solution containing a small amount of [C 6 MIM]Cl (0.034 g) to form a water-immiscible ionic liquid, [C 6 MIM]NTf 2 , as extraction solution. The mixed solutions were placed in an ultrasonic water bath at 150 W for 4 min and centrifuged at 3500 rpm for 10 min to achieve phase separation. After centrifugation, fine droplets of the extractant phase settled to the bottom of the centrifuge tube and were directly injected into the high-performance liquid chromatography system for analysis. The quantity of [C 6 MIM]Cl, the molar ratio of [C 6 MIM]Cl and LiNTf 2 , ionic strength , ultrasound time, and centrifugation time, were optimized using a Plackett–Burman design. Significant factors obtained were optimized by employing a central composite design. The optimized technique provides good repeatability (RSD 2.4 to 3.5%), linearity (0.5 μg/L to 500 μg/L), low LODs (0.06 μg/L to 0.08 μg/L) and great enrichment factor (244 to 268). The developed method can be applied in routine analysis for the determining of phenylurea pesticides in environmental samples.
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高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Guijiao Zhao,Chenhuan Wang,Min Kang,Lin Hao,Weihua Liu,Zhi Wang,Xiaodong Shi,Qiuhua Wu
Developing effective methods for highly sensitive detection of phenolic endocrine disruptors (EDCs) is especially urgent. Herein, a magnetic hydroxyl-functional porous organic polymer (M-FH-POP) was facilely synthesized by green diazo-couple reaction using basic fuchsin and hesperetin as monomer for the first time. M-FH-POP delivered superior adsorption performance for phenolic EDCs. The adsorption mechanism was hydrogen bonds, hydrophobic interaction and π-π interplay. With M-FH-POP as adsorbent, a magnetic solid phase extraction method was established for extracting trace phenolic EDCs (bisphenol A, 4- tert -butylphenol, bisphenol F and bisphenol B) in water and fish before ultra-high performance liquid chromatography tandem mass spectrometry analysis. The method displayed low detection limit (S/N = 3) of 0.05–0.15 ng mL −1 for water and 0.08–0.3 ng g −1 for fish. The spiked recoveries were 88.3 %–109.8 % with the relative standard deviations of 2.4 %–6.4 %. The method offers a new strategy for sensitive determination of phenolic EDCs in water and fish samples.
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高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Hua Wang,Lin Hao,Yaxing Guo,Chun Wang,Qiuhua Wu,Zhi Wang
Porous electron-rich organic frameworks have attracted an increased attention in the adsorption and removal of pollutants due to their abundant electron-rich nitrogen atoms, which can effectively interact with positively charged substance. In this study, a porous electron-rich organic framework (Car-POF) and positively charged amino-functionalized magnetic nanoparticles (Fe 3 O 4 -NH 2 ) were used to construct a magnetic electron-rich Fe 3 O 4 -NH 2 @Car-POF for the enrichment of some phenylurea herbicides from water and milk samples prior to high performance liquid chromatographic detection. The adsorption capacity of Fe 3 O 4 -NH 2 @Car-POF for the phenylureas ranged from 14.93 to 28.83 mg g −1 . The LODs were observed in the range of 0.05–0.20 ng mL −1 and 0.5–1.5 ng mL −1 , and LOQs in the range of 0.17–0.66 ng mL −1 and 1.7–5.0 ng mL −1 for water and milk samples with RSD less than 9.0. The adsorption studies with cationic and anionic dyes revealed that Fe 3 O 4 -NH 2 @Car-POF is favorable for the adsorption of positively charged compounds.
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高影响因子
TALANTA
·
2016
·
IF 4.035
Huazi Wang,Lu Hu,Wanzhen Li,Xiaoling Yang,Runhua Lu,Sanbing Zhang,Wenfeng Zhou,Haixiang Gao,Jing Li
A novel in-syringe dispersive liquid-liquid microextraction based on the solidification of ionic liquids (in-syringe SIL-DLLME) was coupled with high-performance liquid chromatography-ultraviolet detector (HPLC-UVD) to detect five benzoylurea insecticides (BUs) in water and tea beverage samples. In this method, the hydrophobic ionic liquid [N 8881 ][PF 6 ] was formed in situ by the metathesis reaction between [N 8881 ]Cl and the anion-exchange reagent KPF 6 to extract the target analytes. The whole extraction procedure was performed in a syringe. The solidified extractant could be separated from the aqueous phase by exposing the emulsified extraction solution to an ice bath and then easily collected by squeezing out the aqueous phase through the prepared NWPP-based needle. Various parameters affecting the extraction efficiency, such as the amount of [N 8881 ]Cl, the molar ratio of [N 8881 ]Cl to KPF 6 , salt addition, cooling time, solution temperature, sample pH and sample volume, were evaluated. Under the optimized conditions, the proposed method was validated with satisfactory results: good linearities with coefficients of determination greater than 0.99 were obtained in the range of 2–500 µg L −1 ; the limits of detection varied between 0.29 and 0.59 µg L −1 ; the recoveries of the five benzoylurea insecticides ranged from 85.93% to 90.52%; and the intra-day ( n =3) and inter-day ( n =3) relative standard deviations were less than 5.36%. Finally, the proposed method was successfully used for the determination of BUs in real water and tea beverage samples.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 97
·95283-95291
·
IF 3.289
Lu Hu,Heng Qian,Xiaoling Yang,Songqing Li,Sanbing Zhang,Runhua Lu,Wenfeng Zhou,Haixiang Gao
A novel and simple method for effervescence-assisted dispersive liquid–liquid microextraction based on the solidification of a floating ionic liquid using a special collection method combined with high-performance liquid chromatography is developed for the determination of four benzoylureas in water samples. In this method, the ionic liquid (IL), trihexyl(tetradecyl)phosphonium tetrafluoroborate, is used rather than organic drops, which have limitations, as the extraction solvent for the first time in dispersive liquid–liquid microextraction based on the solidification of floating organic drops (DLLME-SFO). Due to the high viscosity of the IL, it can be quickly collected in the lid of the centrifuge tube after solidification, which combines the advantages of both dispersive liquid–liquid microextraction and liquid phase microextraction based on the solidification of a floating IL. Furthermore, effervescence is used to disperse the IL, thereby avoiding the use of an organic dispersant. The influence of various experimental factors, such as the form of the effervescent material, IL quantity, base to acid ratio in the effervescent tablet, weight ratio of IL to effervescent tablet, ultrasonication time, centrifugation time, extraction temperature, sample pH, extraction time and salt addition, are optimized using a central composite design and the one-factor-at-a-time approach. Under the optimal conditions, good linearity was obtained for the four BUs from 2 to 500 μg L−1, with correlation coefficients ranging from 0.9994 to 0.9995. The recoveries were 90.2–100.2% with relative standard deviations ranging from 1.3–4.4%. The limits of detection for the analytes were between 0.77 to 1.58 μg L−1, and the enrichment factors ranged from 206 to 228. Additionally, this method was successfully applied for the determination of four BUs in real water samples.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2016
·
IF 4.712
Xiaoling Yang,Kexin Qiao,Yiren Ye,Miyi Yang,Jing Li,Haixiang Gao,Sanbing Zhang,Wenfeng Zhou,Runhua Lu
In this study, the superparamagnetic attapulgite/Fe 3 O 4 /polyaniline (ATP/Fe 3 O 4 /PANI) nanocomposites were successfully synthesized by a one-pot method. Fe (III) was applied as both the oxidant for the oxidative polymerization of aniline and the single iron source of Fe 3 O 4 formed by the redox reaction between aniline and Fe (III). The ATP/Fe 3 O 4 /PANI was used as sorbent for magnetic dispersive solid phase extraction (MDSPE) of benzoylurea insecticides (BUs) in environmental water samples. The as-prepared nanocomposite sorbents were characterized by Fourier transform infrared spectra (FT-IR), X Ray diffraction (XRD), scanning electron microscopy(SEM), transmission electron microscopy (TEM), and vibrating sample magnetometry . Various experimental parameters affecting the ATP/Fe 3 O 4 /PANI-based MDSPE procedure, including the composition of the nanocomposite sorbents, amount of ATP/Fe 3 O 4 /PANI nanocomposites, vortex time, pH, and desorption conditions were investigated. Under the optimal conditions, a good linearity was observed for all target analytes, with correlation coefficients (r 2 ) ranging from 0.9985 to 0.9997; the limits of detection (LOD) were in the range of 0.02–0.43 μg L −1 , and the recoveries of analytes using the proposed method ranged between 77.37% and 103.69%. The sorbents exhibited an excellent reproducibility in the range of 1.52–5.27% in extracting the five target analytes. In addition, the intra-day and inter-day precision values were found to be in the range of 0.78–6.86% and 1.66–8.41%, respectively. Finally, the proposed ATP/Fe 3 O 4 /PANI-based MDSPE method was successfully applied to analyze river water samples by rapid preconcentration of BUs.
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-8
·
IF 4.58
Wang Juntao,Jiao Caina,Li Menghua,Wang Xiaolan,Wang Chun,Wu Qiuhua,Wang Zhi
Porphyrin-based porous organic polymers (P-POPs) are amorphous polymers linked by strong covalent bonds between the porphyrin subunits that act as building blocks. The authors describe a magnetic P-POP that possesses high surface area, a highly porous structure, and strong magnetism. The MP-POP was employed as a magnetic sorbent for the extraction of benzoylurea insecticides from cucumber and tomato samples prior to their determination by HPLC. The sorbent has a typical sorption capacity of 1.90–2.00 mg∙g −1 . The method exhibits a good linear range (0.8–160 ng·g −1 ), low limits of detection (0.08–0.2 ng·g −1 ), and high method recoveries (81.8–103.5%) for cucumber and tomato samples. The MP-POP has different adsorption capabilities for the benzoylurea insecticides, phenylurea herbicides and phenols compounds, and the adsorption mechanism is found to be based on π-stacking, hydrogen-bonding, and hydrophobic interactions.
A novel magnetic porphyrin-based porous organic polymer was fabricated and used as the adsorbent for the efficient extraction of benzoylurea insecticides.
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高影响因子
Science China-Chemistry
·
2013
·Vol. 56
·期 11
·1641-1650
·
IF 1.327
Qing XiangDong,Wu HaiLong,Nie ChongChong,Li Yong,Yan XiuFang,Zhang XiHua,Yin XiaoLi,Yu RuQin
This work presents a novel application of second-order calibration based on self-weighted alternating trilinear decomposition (SWATLD) algorithm for analyzing the HPLC-DAD data. The proposed method makes it possible to simultaneously determine teflubenzuron, hexaflumuron, flufenoxuron, chlorfluazuron, diflubenzuron and benzoylurea in different fruit samples, i.e. pear, apple and banana, in the selected time region of chromatogram. The concentration, elution time and spectral information of these benzoylurea insecticides are selectively extracted from complex matrices even in the presence of unknown interferences. The root-mean-square error of prediction (RMSEP) and figures of merit, including sensitivity (SEN), selectivity (SEL) and limit of detection (LOD) are employed to access the performance of the method. The LODs obtained for these insecticides are within the range 0.017–0.26 ppm in pears, 0.039–0.33 ppm in apples, 0.041–0.44 ppm in bananas, respectively. Such a chemometrics-based protocol holds great potential to be extended as a promising alternative for more practical applications in food safety and quality monitoring.
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危险品化学品经营许可证（带存储）