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Meng Mei - One of the best experts on this subject based on the ideXlab platform.
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Online analysis of five organic ultraviolet filters in environmental water samples using magnetism-enhanced monolith-based in-tube solid phase microextraction coupled with high-performance liquid chromatography.
Journal of chromatography. A, 2017Co-Authors: Meng Mei, Xiaojia HuangAbstract:Due to the endocrine disrupting properties, organic UV filters have been a great risk for humans and other organisms. Therefore, development of accuRate and effective analytical methods is needed for the determination of UV filters in environmental waters. In this work, a fast, sensitive and environmentally friendly method combining magnetism-enhanced monolith-based in-tube solid phase microextraction with high-performance liquid chromatography with diode array detection (DAD) (ME-MB-IT/SPME-HPLC-DAD) for the online analysis of five organic UV filters in environmental water samples was developed. To extract UV filters effectively, an ionic liquid-based monolithic capillary column doped with magnetic nanoparticles was prepared by in-situ polymerization and used as extraction medium of online ME-MB-IT/SPME-HPLC-DAD system. Several extraction conditions including the intensity of magnetic field, sampling and desorption Flow Rate, Volume of sample and desorption solvent, pH value and ionic strength of sample matrix were optimized thoroughly. Under the optimized conditions, the extraction efficiencies for five organic UV filters were in the range of 44.0-100%. The limits of detection (S/N=3) and limits of quantification (S/N=10) were 0.04-0.26μg/L and 0.12-0.87μg/L, respectively. The precisions indicated by relative standard deviations (RSDs) were less than 10% for both intra- and inter-day variabilities. Finally, the developed method was successfully applied to the determination of UV filters in three environmental water samples and satisfactory results were obtained.
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Effective extraction of triazines from environmental water samples using magnetism-enhanced monolith-based in-tube solid phase microextraction
Analytica chimica acta, 2016Co-Authors: Meng Mei, Xiaojia Huang, Xiaodong Yang, Qing LuoAbstract:Abstract This article reports on the effective extraction of triazines from environmental water samples using magnetism-enhanced monolith-based in-tube solid phase microextraction (ME-MB/IT-SPME). Firstly, monolithic poly (octyl methacrylate- co -ethyleneglycol dimethacrylate) capillary column doped with magnetic nanoparticles was synthesized inside a fused silica. After that, the monolithic capillary column was placed inside a magnetic coil that allowed the exertion of a variable magnetic field during adsorption and desorption steps. The effects of intensity of magnetic field, adsorption and desorption Flow Rate, Volume of sample and desorption solvent, pH value and ionic strength in sample matrix on the performance of ME-MB/IT-SPME for triazines were investigated in details. Under the optimized conditions, the developed ME-MB/IT-SPME showed satisfactory quantitative extraction efficiencies of the target analytes between 64.8% and 99.7%. At the same time, the ME-MB/IT-SPME was combined with high-performance liquid chromatography with diode array detection to detect six triazines in water samples. The limits of detection (S/N = 3) and limits of quantification (S/N = 10) were in the ranges of 0.074–0.23 μg/L and 0.24–0.68 μg/L, respectively. The precision of the proposed method was evaluated in terms of intra- and inter-assay variability calculated as relative standard deviation, and it was found that the values were all below 10%. Finally, the developed method was successfully applied for environmental water samples such as farmland, lake and river water with spiked recoveries in the range of 70.7–119%.
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Magnetism-Enhanced Monolith-Based In-Tube Solid Phase Microextraction
Analytical chemistry, 2016Co-Authors: Meng Mei, Xiaojia Huang, Qing Luo, Dongxing YuanAbstract:Monolith-based in-tube solid phase microextraction (MB/IT-SPME) has received wide attention because of miniaturization, automation, expected loading capacity, and environmental friendliness. However, the unsatisfactory extraction efficiency becomes the main disadvantage of MB/IT-SPME. To overcome this circumstance, magnetism-enhanced MB/IT-SPME (ME-MB/IT-SPME) was developed in the present work, taking advantage of magnetic microfluidic principles. First, modified Fe3O4 nanoparticles were mixed with polymerization solution and in situ polymerized in the capillary to obtain a magnetic monolith extraction phase. After that, the monolithic capillary column was placed inside a magnetic coil that allowed the exertion of a variable magnetic field. The effects of intensity of magnetic field, adsorption and desorption Flow Rate, Volume of sample, and desorption solvent on the performance of ME-MB/IT-SPME were investigated in detail. The analysis of six steroid hormones in water samples by the combination of ME-MB/...
Xiaojia Huang - One of the best experts on this subject based on the ideXlab platform.
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Online analysis of five organic ultraviolet filters in environmental water samples using magnetism-enhanced monolith-based in-tube solid phase microextraction coupled with high-performance liquid chromatography.
Journal of chromatography. A, 2017Co-Authors: Meng Mei, Xiaojia HuangAbstract:Due to the endocrine disrupting properties, organic UV filters have been a great risk for humans and other organisms. Therefore, development of accuRate and effective analytical methods is needed for the determination of UV filters in environmental waters. In this work, a fast, sensitive and environmentally friendly method combining magnetism-enhanced monolith-based in-tube solid phase microextraction with high-performance liquid chromatography with diode array detection (DAD) (ME-MB-IT/SPME-HPLC-DAD) for the online analysis of five organic UV filters in environmental water samples was developed. To extract UV filters effectively, an ionic liquid-based monolithic capillary column doped with magnetic nanoparticles was prepared by in-situ polymerization and used as extraction medium of online ME-MB-IT/SPME-HPLC-DAD system. Several extraction conditions including the intensity of magnetic field, sampling and desorption Flow Rate, Volume of sample and desorption solvent, pH value and ionic strength of sample matrix were optimized thoroughly. Under the optimized conditions, the extraction efficiencies for five organic UV filters were in the range of 44.0-100%. The limits of detection (S/N=3) and limits of quantification (S/N=10) were 0.04-0.26μg/L and 0.12-0.87μg/L, respectively. The precisions indicated by relative standard deviations (RSDs) were less than 10% for both intra- and inter-day variabilities. Finally, the developed method was successfully applied to the determination of UV filters in three environmental water samples and satisfactory results were obtained.
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Effective extraction of triazines from environmental water samples using magnetism-enhanced monolith-based in-tube solid phase microextraction
Analytica chimica acta, 2016Co-Authors: Meng Mei, Xiaojia Huang, Xiaodong Yang, Qing LuoAbstract:Abstract This article reports on the effective extraction of triazines from environmental water samples using magnetism-enhanced monolith-based in-tube solid phase microextraction (ME-MB/IT-SPME). Firstly, monolithic poly (octyl methacrylate- co -ethyleneglycol dimethacrylate) capillary column doped with magnetic nanoparticles was synthesized inside a fused silica. After that, the monolithic capillary column was placed inside a magnetic coil that allowed the exertion of a variable magnetic field during adsorption and desorption steps. The effects of intensity of magnetic field, adsorption and desorption Flow Rate, Volume of sample and desorption solvent, pH value and ionic strength in sample matrix on the performance of ME-MB/IT-SPME for triazines were investigated in details. Under the optimized conditions, the developed ME-MB/IT-SPME showed satisfactory quantitative extraction efficiencies of the target analytes between 64.8% and 99.7%. At the same time, the ME-MB/IT-SPME was combined with high-performance liquid chromatography with diode array detection to detect six triazines in water samples. The limits of detection (S/N = 3) and limits of quantification (S/N = 10) were in the ranges of 0.074–0.23 μg/L and 0.24–0.68 μg/L, respectively. The precision of the proposed method was evaluated in terms of intra- and inter-assay variability calculated as relative standard deviation, and it was found that the values were all below 10%. Finally, the developed method was successfully applied for environmental water samples such as farmland, lake and river water with spiked recoveries in the range of 70.7–119%.
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Magnetism-Enhanced Monolith-Based In-Tube Solid Phase Microextraction
Analytical chemistry, 2016Co-Authors: Meng Mei, Xiaojia Huang, Qing Luo, Dongxing YuanAbstract:Monolith-based in-tube solid phase microextraction (MB/IT-SPME) has received wide attention because of miniaturization, automation, expected loading capacity, and environmental friendliness. However, the unsatisfactory extraction efficiency becomes the main disadvantage of MB/IT-SPME. To overcome this circumstance, magnetism-enhanced MB/IT-SPME (ME-MB/IT-SPME) was developed in the present work, taking advantage of magnetic microfluidic principles. First, modified Fe3O4 nanoparticles were mixed with polymerization solution and in situ polymerized in the capillary to obtain a magnetic monolith extraction phase. After that, the monolithic capillary column was placed inside a magnetic coil that allowed the exertion of a variable magnetic field. The effects of intensity of magnetic field, adsorption and desorption Flow Rate, Volume of sample, and desorption solvent on the performance of ME-MB/IT-SPME were investigated in detail. The analysis of six steroid hormones in water samples by the combination of ME-MB/...
Qing Luo - One of the best experts on this subject based on the ideXlab platform.
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Effective extraction of triazines from environmental water samples using magnetism-enhanced monolith-based in-tube solid phase microextraction
Analytica chimica acta, 2016Co-Authors: Meng Mei, Xiaojia Huang, Xiaodong Yang, Qing LuoAbstract:Abstract This article reports on the effective extraction of triazines from environmental water samples using magnetism-enhanced monolith-based in-tube solid phase microextraction (ME-MB/IT-SPME). Firstly, monolithic poly (octyl methacrylate- co -ethyleneglycol dimethacrylate) capillary column doped with magnetic nanoparticles was synthesized inside a fused silica. After that, the monolithic capillary column was placed inside a magnetic coil that allowed the exertion of a variable magnetic field during adsorption and desorption steps. The effects of intensity of magnetic field, adsorption and desorption Flow Rate, Volume of sample and desorption solvent, pH value and ionic strength in sample matrix on the performance of ME-MB/IT-SPME for triazines were investigated in details. Under the optimized conditions, the developed ME-MB/IT-SPME showed satisfactory quantitative extraction efficiencies of the target analytes between 64.8% and 99.7%. At the same time, the ME-MB/IT-SPME was combined with high-performance liquid chromatography with diode array detection to detect six triazines in water samples. The limits of detection (S/N = 3) and limits of quantification (S/N = 10) were in the ranges of 0.074–0.23 μg/L and 0.24–0.68 μg/L, respectively. The precision of the proposed method was evaluated in terms of intra- and inter-assay variability calculated as relative standard deviation, and it was found that the values were all below 10%. Finally, the developed method was successfully applied for environmental water samples such as farmland, lake and river water with spiked recoveries in the range of 70.7–119%.
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Magnetism-Enhanced Monolith-Based In-Tube Solid Phase Microextraction
Analytical chemistry, 2016Co-Authors: Meng Mei, Xiaojia Huang, Qing Luo, Dongxing YuanAbstract:Monolith-based in-tube solid phase microextraction (MB/IT-SPME) has received wide attention because of miniaturization, automation, expected loading capacity, and environmental friendliness. However, the unsatisfactory extraction efficiency becomes the main disadvantage of MB/IT-SPME. To overcome this circumstance, magnetism-enhanced MB/IT-SPME (ME-MB/IT-SPME) was developed in the present work, taking advantage of magnetic microfluidic principles. First, modified Fe3O4 nanoparticles were mixed with polymerization solution and in situ polymerized in the capillary to obtain a magnetic monolith extraction phase. After that, the monolithic capillary column was placed inside a magnetic coil that allowed the exertion of a variable magnetic field. The effects of intensity of magnetic field, adsorption and desorption Flow Rate, Volume of sample, and desorption solvent on the performance of ME-MB/IT-SPME were investigated in detail. The analysis of six steroid hormones in water samples by the combination of ME-MB/...
Hui Chen - One of the best experts on this subject based on the ideXlab platform.
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preparation of molecularly imprinted polymer monolith with an analogue of thiamphenicol and application to selective solid phase microextraction
Food Analytical Methods, 2012Co-Authors: Hui Chen, Na Sun, Huaixia ChenAbstract:A molecularly imprinted polymer (MIP) monolith has been prepared and characterized. Its application to the assay of thiamphenicol in milk with high-performance liquid chromatography–photodiodes array detector was validated. The newly developed MIP monolith was produced using an analogue to thiamphenicol as the template molecule to avoid major traditional drawback associated with MIPs of residual template bleeding. The MIP monolith synthesized in a micropipette tip could be connected with syringes in different sizes simply to perform solid-phase microextraction process without any other treatment. This molecularly imprinted polymer monolith microextraction (MIPMME) method showed high selectivity and enrichment ability for thiamphenicol (TAP). Several parameters affecting MIPMME were investigated, including the Flow Rate, Volume, pH and salt concentration of sample, the type and Volume of washing solution, and the type and Flow Rate of eluent. The recovery of this method for TAP was investigated and high recoveries of 93.5 ~ 96.8% from milk were obtained with relative standard deviations less than 6.3%.
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selective determination of trace thiamphenicol in milk and honey by molecularly imprinted polymer monolith microextraction and high performance liquid chromatography
IEEE Journal of Solid-state Circuits, 2012Co-Authors: Huaixia Chen, Hui ChenAbstract:A novel solid-phase microextraction (SPME) method based on molecularly imprinted polymer (MIP) monolith as the sorbent for the selective extraction of thiamphenicol (TAP) in milk and honey was developed. The newly developed MIP monolith was produced using TAP as the template molecule, 4-vinylpyridine (4-VP) as the functional monomer. The TAP-MIP monolith synthesized in a micropipette tip could be connected with syringes in different sizes simply to perform SPME process without any other treatment. The derivated MIP monolith showed high selectivity and enrichment ability for TAP. A simple, rapid and sensitive method for the determination of TAP in milk and honey using polymer monolith microextraction (PMME) based on the MIP monolith combined with high-performance liquid chromatography-photodiodes array detector was developed. Several parameters affecting MIP monolith microextraction were investigated, including the Flow Rate, Volume, pH and salt concentration of sample, the type and Volume of washing solution, the type and Flow Rate of eluent. The recovery of this method for TAP was investigated and high recoveries of 92.9-99.3% from milk and honey were obtained with relative standard deviations less than 4.9%.
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Selective determination of trace thiamphenicol in milk and honey by molecularly imprinted polymer monolith microextraction and high‐performance liquid chromatography
Journal of separation science, 2011Co-Authors: Huaixia Chen, Hui ChenAbstract:A novel solid-phase microextraction (SPME) method based on molecularly imprinted polymer (MIP) monolith as the sorbent for the selective extraction of thiamphenicol (TAP) in milk and honey was developed. The newly developed MIP monolith was produced using TAP as the template molecule, 4-vinylpyridine (4-VP) as the functional monomer. The TAP-MIP monolith synthesized in a micropipette tip could be connected with syringes in different sizes simply to perform SPME process without any other treatment. The derivated MIP monolith showed high selectivity and enrichment ability for TAP. A simple, rapid and sensitive method for the determination of TAP in milk and honey using polymer monolith microextraction (PMME) based on the MIP monolith combined with high-performance liquid chromatography-photodiodes array detector was developed. Several parameters affecting MIP monolith microextraction were investigated, including the Flow Rate, Volume, pH and salt concentration of sample, the type and Volume of washing solution, the type and Flow Rate of eluent. The recovery of this method for TAP was investigated and high recoveries of 92.9-99.3% from milk and honey were obtained with relative standard deviations less than 4.9%.
Ali Rehber Türker - One of the best experts on this subject based on the ideXlab platform.
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Development of a method for speciation of inorganic arsenic in waters using solid phase extraction and electrothermal atomic absorption spectrometry
International Journal of Environmental Analytical Chemistry, 2015Co-Authors: Adalet Tunçeli, Gülay Ocak, Orhan Acar, Ali Rehber TürkerAbstract:ABSTRACTA solid phase extraction (SPE) procedure based on Amberlite IRA 900 resin was developed for speciation and separation of inorganic arsenic species (III, V) and total As in water samples. The As species and total As in eluent solutions were determined by electrothermal atomic absorption spectrometry (ETAAS) using Ni chemical modifier with 1200°C pyrolysis temperature. Experimental parameters such as pH value, sample Volume, Flow Rate, Volume and concentration of eluent solution for As(V) were optimised and 98.0 ± 1.9% recovery was found at pH 4.0. Experimental adsorption capacity of the resin for As(V) was investigated and 229.9 mg g–1 was found. Under optimised experimental conditions, instrumental parameters such as limit of detection (LOD) and limit of quantification (LOQ) found were 0.126 and 0.420 µg L–1, respectively. Interference effects of coexisting ions in the sample matrix on the recovery of As(V) were investigated. Concentration of As(III) was obtained by subtracting As(V) concentration...
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determination of inorganic arsenic species by hydride generation atomic absorption spectrometry in water samples after preconcentration separation on nano zro2 b2o3 by solid phase extraction
Desalination, 2011Co-Authors: Hakan Erdogan, Ozcan Yalcinkaya, Ali Rehber TürkerAbstract:Abstract A solid phase preconcentration procedure using hybrid sorbent based on nano zirconium dioxide–boron oxide for the speciation and determination of As(III), As(V) and total As in water samples by hydride generation atomic absorption spectrometry (HGAAS) was presented. Experimental parameters including pH, sample Volume, Flow Rate, Volume and concentration of eluent that affect the recovery of the arsenic species have been optimized. Under optimized experimental conditions, analytical parameters including limit of detection, limit of quantification, linear working range, precision and accuracy have also been determined. Interfering effects of matrix constituent on the recovery of the arsenic were studied. The reusability and adsorption capacity of the new hybrid sorbent were also investigated. The hybrid sorbent was successfully applied for preconcentration and speciation of arsenic(V) from various samples with recovery of 99 ± 5%. The analytical limit of detection was found 9.25 ng/L. The hybrid sorbent was stable up to 100 runs. Adsorption capacities of the hybrid sorbent were 98.04 mg/g for As(V). The accuracy of the method was tested by analyzing certified reference material (SPS-WW1 Waste Water) and spiked real samples. The method has been applied for the determination of analytes in tap water, underground water.
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Determination of inorganic arsenic species by hydride generation atomic absorption spectrometry in water samples after preconcentration/separation on nano ZrO2/B2O3 by solid phase extraction
Desalination, 2011Co-Authors: Hakan Erdogan, Ozcan Yalcinkaya, Ali Rehber TürkerAbstract:Abstract A solid phase preconcentration procedure using hybrid sorbent based on nano zirconium dioxide–boron oxide for the speciation and determination of As(III), As(V) and total As in water samples by hydride generation atomic absorption spectrometry (HGAAS) was presented. Experimental parameters including pH, sample Volume, Flow Rate, Volume and concentration of eluent that affect the recovery of the arsenic species have been optimized. Under optimized experimental conditions, analytical parameters including limit of detection, limit of quantification, linear working range, precision and accuracy have also been determined. Interfering effects of matrix constituent on the recovery of the arsenic were studied. The reusability and adsorption capacity of the new hybrid sorbent were also investigated. The hybrid sorbent was successfully applied for preconcentration and speciation of arsenic(V) from various samples with recovery of 99 ± 5%. The analytical limit of detection was found 9.25 ng/L. The hybrid sorbent was stable up to 100 runs. Adsorption capacities of the hybrid sorbent were 98.04 mg/g for As(V). The accuracy of the method was tested by analyzing certified reference material (SPS-WW1 Waste Water) and spiked real samples. The method has been applied for the determination of analytes in tap water, underground water.