WTS database

Title	Pub Year	Author Sort descending	SearchLink
Development of multiwalled carbon nanotubes based micro-solid-phase extraction for the determination of trace levels of sixteen polycyclic aromatic hydrocarbons in environmental water samples	2011	Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Journal of chromatography.A Periodical, Abbrev. J.Chromatogr.A Pub Date Free Form 30-Dec Volume 1218 Issue 52 Start Page 9321 Other Pages 9327 Notes CI: Copyright (c) 2011; JID: 9318488; 0 (Nanotubes, Carbon); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Water Pollutants, Chemical); 2011/06/15 [received]; 2011/10/11 [revised]; 2011/10/28 [accepted]; 2011/11/03 [aheadofprint]; ppublish Place of Publication Netherlands ISSN/ISBN 1873-3778; 0021-9673 Accession Number PMID: 22099227 Language eng SubFile Journal Article; Research Support, Non-U.S. Gov't; IM DOI 10.1016/j.chroma.2011.10.066 [doi] Output Language Unknown(0) PMID 22099227 Abstract Micro-solid-phase extraction (mu-SPE) was developed for the determination of trace level of 16 United States Environmental Protection Agency priority polycyclic aromatic hydrocarbons (PAHs) in river water samples with gas chromatography-mass spectrometry (GC-MS). In the mu-SPE device, multiwalled carbon nanotubes was employed as sorbent and was packed inside an porous polypropylene membrane "envelope" whose edges were heat-sealed to secure the contents. The mu-SPE device was placed in a stirred sample solution to extract the analytes. The porous polypropylene membrane envelope in mu-SPE device acts as a filter to exclude potential interferences, such as eliminating or reducing the influence of particles that are bigger than the pore size. After extraction, analyte desorption was carried out with a suitable organic solvent under ultrasonication. Important extraction parameters were optimized in detail, including the selection and amount of sorbent materials, the extraction temperature and extraction time, desorption solvent and desorption time, amount of organic modifier, agitation speed and sample ionic strength. Under the developed extraction conditions, the proposed method provided good linearity in the range of 0.1-50 mug/L, low limits of detection (4.2-46.5 ng/L), and good repeatability of the extractions (relative standard deviations, Descriptors Links Book Title Database Publisher Elsevier B.V Data Source Authors Guo,L., Lee,H.K. Original/Translated Title URL Date of Electronic 20111103 PMCID Editors
Low-density solvent-based solvent demulsification dispersive liquid-liquid microextraction for the fast determination of trace levels of sixteen priority polycyclic aromatic hydrocarbons in environmental water samples	2011	Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Journal of chromatography.A Periodical, Abbrev. J.Chromatogr.A Pub Date Free Form 5-Aug Volume 1218 Issue 31 Start Page 5040 Other Pages 5046 Notes CI: Copyright (c) 2011; JID: 9318488; 0 (Emulsions); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Solvents); 0 (Water Pollutants, Chemical); 2011/03/31 [received]; 2011/05/18 [revised]; 2011/05/19 [accepted]; 2011/05/27 [aheadofprint]; ppublish Place of Publication Netherlands ISSN/ISBN 1873-3778; 0021-9673 Accession Number PMID: 21676403 Language eng SubFile Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't; IM DOI 10.1016/j.chroma.2011.05.069 [doi] Output Language Unknown(0) PMID 21676403 Abstract For the first time, the low-density solvent-based solvent demulsification dispersive liquid-liquid microextraction was developed for the fast, simple, and efficient determination of 16 priority polycyclic aromatic hydrocarbons (PAHs) in environmental samples followed by gas chromatography-mass spectrometric (GC-MS) analysis. In the extraction procedure, a mixture of extraction solvent (n-hexane) and dispersive solvent (acetone) was injected into the aqueous sample solution to form an emulsion. A demulsification solvent was then injected into the aqueous solution to break up the emulsion, which turned clear and was separated into two layers. The upper layer (n-hexane) was collected and analyzed by GC-MS. No centrifugation was required in this procedure. Significantly, the extraction needed only 2-3 min, faster than conventional DLLME or similar techniques. Another feature of the procedure was the use of a flexible and disposable polyethylene pipette as the extraction device, which permitted a solvent with a density lighter than water to be used as extraction solvent. This novel method expands the applicability of DLLME to a wider range of solvents. Furthermore, the method was simple and easy to use, and some additional steps usually required in conventional DLLME or similar techniques, such as the aforementioned centrifugation, ultrasonication or agitation of the sample solution, or refrigeration of the extraction solvent were not necessary. Important parameters affecting the extraction efficiency were investigated in detail. Under the optimized conditions, the proposed method provided a good linearity in the range of 0.05-50 mug/L, low limits of detection (3.7-39.1 ng/L), and good repeatability of the extractions (RSDs below 11%, n=5). The proposed method was successfully applied to the extraction of PAHs in rainwater samples, and was demonstrated to be fast, efficient, and convenient. Descriptors Links Book Title Database Publisher Elsevier B.V Data Source Authors Guo,L., Lee,H.K. Original/Translated Title URL Date of Electronic 20110527 PMCID Editors
Commercial polymeric fiber as sorbent for solid-phase microextraction combined with high-performance liquid chromatography for the determination of polycyclic aromatic hydrocarbons in water	2009	Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Journal of chromatography.A Periodical, Abbrev. J.Chromatogr.A Pub Date Free Form 30-Oct Volume 1216 Issue 44 Start Page 7520 Other Pages 7526 Notes JID: 9318488; 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Polymers); 0 (Water Pollutants, Chemical); 2008/12/30 [received]; 2009/08/07 [revised]; 2009/09/09 [accepted]; 2009/09/12 [aheadofprint]; ppublish Place of Publication Netherlands ISSN/ISBN 1873-3778; 0021-9673 Accession Number PMID: 19786278 Language eng SubFile Journal Article; Research Support, Non-U.S. Gov't; IM DOI 10.1016/j.chroma.2009.09.019 [doi] Output Language Unknown(0) PMID 19786278 Abstract A novel microextraction method making use of commercial polymer fiber as sorbent, coupled with high-performance liquid chromatography-fluorescence detection for the determination of polycyclic aromatic hydrocarbons (PAHs) in water has been developed. In this technique, the extraction device was simply a length (8 cm) of a strand of commercial polymer fiber, Kevlar (each strand consisted of 1000 filaments, each of diameter ca. 9.23 microm), that was allowed to tumble freely in the aqueous sample solution during extraction. The extracted analytes were desorbed ultrasonically before the extract was injected into HPLC system for analysis. Extraction parameters such as extraction time, desorption time, type of desorption solvent and sample volume were optimized. Each fiber could be used for up to 50 extractions and the method showed good precision, reproducibility and linear response within a concentration range 0.05-5.00 microg L(-1) with correlation coefficients of up to 0.9998. Limits of detection between 0.4 and 4.4 ng L(-1) for seven PAHs could be achieved. The relative standard deviations (n=3) of this technique were between 2.9% and 12.1%. Descriptors Chromatography, High Pressure Liquid/methods, Microscopy, Electron, Scanning, Polycyclic Hydrocarbons, Aromatic/analysis, Polymers/analysis, Solid Phase Microextraction/methods, Water Pollutants, Chemical/analysis Links Book Title Database Publisher Data Source Authors Hii,T. M., Basheer,C., Lee,H. K. Original/Translated Title URL Date of Electronic 20090912 PMCID Editors
Development and evaluation of plunger-in-needle liquid-phase microextraction	2014	Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.; Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.; Department of Chemistry, National Unive	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Journal of chromatography.A Periodical, Abbrev. J.Chromatogr.A Pub Date Free Form 24-Jan Volume 1326 Issue Start Page 20 Other Pages 28 Notes CI: Copyright (c) 2013; JID: 9318488; 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Solvents); 0 (Water Pollutants, Chemical); 3FPU23BG52 (Toluene); OTO: NOTNLM; 2013/09/07 [received]; 2013/12/16 [revised]; 2013/12/18 [accepted]; 2013/12/27 [aheadofprint]; pp Place of Publication Netherlands ISSN/ISBN 1873-3778; 0021-9673 Accession Number PMID: 24406144 Language eng SubFile Journal Article; Research Support, Non-U.S. Gov't; IM DOI 10.1016/j.chroma.2013.12.056 [doi] Output Language Unknown(0) PMID 24406144 Abstract In this work, a novel, simple and fast one-step liquid-phase microextraction (LPME) approach, termed plunger-in-needle LPME was developed. In this method, the stainless steel plunger wire of a commercially available plunger-in-needle microsyringe was simply etched by immersion in hydrofluoric acid to form a microporous structure, and was used as the extractant solvent holder. The extractant solvent could be easily held within the pores created by the etching. When the plunger wire with the extractant solvent was exposed to the sample solution, analytes directly diffused from the sample solution to the solvent. After extraction, the plunger wire was directly introduced into the injection port of a gas chromatography-mass spectrometry (GC-MS) system for analysis of the analytes after thermal desorption. Polycyclic aromatic hydrocarbons (PAHs) were used as model analytes to evaluate the extraction performance of this new approach to LPME. Parameters affecting the extraction efficiency were investigated in detail. Under the optimized conditions, the method detection limits for 10PAHs were in the range of 0.003 and 0.136mug/L (at a signal/noise ratio of 3), with relative standard deviations of between 2.9% and 9.6% on the same etched plunger wire. The linearities of the calibration plots were from 0.05 to 50 or from 1 to 50mug/L, depending on the PAHs. When this method was applied for the spiked river water sample, the relative recoveries ranged from 70.1% to 106.4%. The proposed method integrates the extraction and extract introduction into one device, without extraneous sorbent needed, which makes the procedure fast and simple. It is also an environmentally friendly approach as the organic solvent consumed is almost negligible. Descriptors Links Book Title Database Publisher Elsevier B.V Data Source Authors Zhang,H., Ng,B.W., Lee,H.K. Original/Translated Title URL Date of Electronic 20131227 PMCID Editors
Antioxidant activity and cytotoxicity study of the flavonol glycosides from Bauhinia galpinii	2007	Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria. marogba@oauife.edu.ng	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Natural product research Periodical, Abbrev. Nat.Prod.Res. Pub Date Free Form Jun Volume 21 Issue 7 Start Page 591 Other Pages 599 Notes LR: 20091119; JID: 101167924; 0 (Antioxidants); 0 (Biphenyl Compounds); 0 (Flavonols); 0 (Formazans); 0 (Glycosides); 0 (Hydrazines); 0 (Picrates); 0 (Tetrazolium Salts); 1898-66-4 (2,2-diphenyl-1-picrylhydrazyl); 23305-68-2 (MTT formazan); ppublish Place of Publication England ISSN/ISBN 1478-6419; 1478-6419 Accession Number PMID: 17613816 Language eng SubFile Journal Article; Research Support, Non-U.S. Gov't; IM DOI 779728379 [pii] Output Language Unknown(0) PMID 17613816 Abstract The antioxidant activity of the crude extract and solvent fractions obtained from the leaves of Bauhinia galpinii was evaluated in terms of capacity to scavenge 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radicals. The crude extract and the more polar solvent fractions (ethyl acetate and butanol) showed considerable antioxidant activity. The antioxidant potential of the extracts, expressed as EC50, ranged between 28.85 +/- 1.28 microg mL(-1)and 118.16 +/- 6.41 microg mL(-1). L-Ascorbic acid was used as a standard (EC50 = 19.79 +/- 0.14 microM). Bioassay guided fractionation of the two active solvent fractions led to the isolation of three flavonoid glycosides, identified as: quercetin-3-O-galactopyranoside (1), myricetin-3-O-galactopyranoside (2), and 2''-O-rhamnosylvitexin (3). These compounds are reported for the first time from this species. The structures of the compounds were determined on the basis of spectral studies (1H NMR, 13C NMR and MS). Their antioxidant potential was evaluated using a DPPH spectrophotometric assay. Compound 2 had higher and 3 had lower antioxidant activity than L-ascorbic acid. No cytotoxic effects were displayed by compounds 1 and 3, but compound 2 was cytotoxic to Vero cells (LC50 = 74.68 microg mL(-1)) and bovine dermis cells (LC50 = 30.69 microg mL(-1)). Descriptors Animals, Antioxidants/chemistry/isolation & purification/pharmacology, Bauhinia/chemistry, Biphenyl Compounds/chemistry, Cattle, Cell Survival/drug effects, Cercopithecus aethiops, Flavonols/chemistry/isolation & purification/pharmacology, Formazans/metabolism, Glycosides/chemistry/isolation & purification/pharmacology, Hydrazines/chemistry, Mass Spectrometry, Nuclear Magnetic Resonance, Biomolecular, Picrates, Plant Leaves/chemistry, Plants, Medicinal/chemistry, Skin/cytology/drug effects, South Africa, Spectrophotometry, Ultraviolet, Tetrazolium Salts/metabolism, Vero Cells Links Book Title Database Publisher Data Source Authors Aderogba,M. A., McGaw,L. J., Ogundaini,A. O., Eloff,J. N. Original/Translated Title URL Date of Electronic PMCID Editors
Determination of brilliant green from fish pond water using carbon nanotube assisted pseudo-stir bar solid/liquid microextraction combined with UV-vis spectroscopy-diode array detection	2011	Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Iran. zarrin_eshaghi@yahoo.com	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Spectrochimica acta.Part A, Molecular and biomolecular spectroscopy Periodical, Abbrev. Spectrochim.Acta A Mol.Biomol.Spectrosc. Pub Date Free Form Aug Volume 79 Issue 3 Start Page 603 Other Pages 607 Notes LR: 20121115; CI: Copyright (c) 2011; JID: 9602533; 0 (Anti-Infective Agents, Local); 0 (Coloring Agents); 0 (Nanotubes, Carbon); 0 (Quaternary Ammonium Compounds); 0 (Water Pollutants, Chemical); G0L543D370 (brilliant green); 2011/02/01 [received]; 2011/ Place of Publication England ISSN/ISBN 1873-3557; 1386-1425 Accession Number PMID: 21531168 Language eng SubFile Evaluation Studies; Journal Article; IM DOI 10.1016/j.saa.2011.03.042 [doi] Output Language Unknown(0) PMID 21531168 Abstract This paper describes the development of a new design of hollow fiber solid/liquid phase microextraction (HF-SLPME) for determination of brilliant green (BG) residues in water fish ponds. This method consists of an aqueous donor phase and carbon nanotube reinforced organic solvent (acceptor phase) operated in direct immersion sampling mode. The multi-walled carbon nanotube dispersed in the organic solvent is held in the pores and lumen of a porous polypropylene hollow fiber. It is in contact directly with the aqueous donor phase. In this method the solid/liquid extractor phase is supported using a polypropylene hollow fiber membrane. Both ends of the hollow fiber segment are sealed with magnetic stoppers. This device is placed inside the donor solution and plays the rule of a pseudo-stir bar. It is disposable, so single use of the fiber reduces the risk of carry-over problems. Brilliant green (BG) after extraction from the aqueous samples with mentioned HF-SLPME device was determined by ultraviolet-visible spectroscopy with diode array detection (UV-vis/DAD). The absorption wavelength was set to 625 nm (lambda(max)). The effect of different variables on the extraction was evaluated and optimized to enhance the sensitivity and extraction efficiency of the proposed method. The calibration curve was linear in the range of 1.00-10,000 mug L(-1) of BG in the initial solution with R(2)=0.979. Detection limit, based on three times the standard deviation of the blank, was 0.55 mug L(-1). All experiments were carried out at room temperature (25+/-0.5 degrees C). Descriptors Links Book Title Database Publisher Elsevier B.V Data Source Authors Es'haghi,Z., Khooni,M.A., Heidari,T. Original/Translated Title URL Date of Electronic 20110409 PMCID Editors
Optimization of a novel method for determination of benzene, toluene, ethylbenzene, and xylenes in hair and waste water samples by carbon nanotubes reinforced sol-gel based hollow fiber solid phase microextraction and gas chromatography using factorial ex	2011	Department of Chemistry, Payame Noor University, Tehran, Iran. zarrin eshaghi@yahoo.com	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Journal of chromatography.A Periodical, Abbrev. J.Chromatogr.A Pub Date Free Form 27-May Volume 1218 Issue 21 Start Page 3400 Other Pages 3406 Notes LR: 20151119; CI: Copyright (c) 2011; JID: 9318488; 0 (Benzene Derivatives); 0 (Nanotubes, Carbon); 0 (Water Pollutants, Chemical); 451W47IQ8X (Sodium Chloride); 2011/01/02 [received]; 2011/03/16 [revised]; 2011/03/17 [accepted]; 2011/04/12 [aheadofprint] Place of Publication Netherlands ISSN/ISBN 1873-3778; 0021-9673 Accession Number PMID: 21489540 Language eng SubFile Journal Article; Research Support, Non-U.S. Gov't; IM DOI 10.1016/j.chroma.2011.03.043 [doi] Output Language Unknown(0) PMID 21489540 Abstract A novel design of solid phase microextraction fiber containing carbon nanotube reinforced sol-gel which was protected by polypropylene hollow fiber (HF-SPME) was developed for pre-concentration and determination of BTEX in environmental waste water and human hair samples. The method validation was included and satisfying results with high pre-concentration factors were obtained. In the present study orthogonal array experimental design (OAD) procedure with OA(16) (4(4)) matrix was applied to study the effect of four factors influencing the HF-SPME method efficiency: stirring speed, volume of adsorption organic solvent, extraction and desorption time of the sample solution, by which the effect of each factor was estimated using individual contributions as response functions in the screening process. Analysis of variance (ANOVA) was employed for estimating the main significant factors and their percentage contributions in extraction. Calibration curves were plotted using ten spiking levels of BTEX in the concentration ranges of 0.02-30,000ng/mL with correlation coefficients (r) 0.989-0.9991 for analytes. Under the optimized extraction conditions, the method showed good linearity (0.3-20,000ng/L), repeatability, low limits of detections (0.49-0.7ng/L) and excellent pre-concentration factors (185-1872). The best conditions which were estimated then applied for the analysis of BTEX compounds in the real samples. Descriptors Links Book Title Database Publisher Elsevier B.V Data Source Authors Es'haghi,Z., Ebrahimi,M., Hosseini,M.S. Original/Translated Title URL Date of Electronic 20110412 PMCID Editors
Crystal structure of N-[(2S,5R)-4-oxo-2,3-diphenyl-1,3-thia-zinan-5-yl]acetamide 0.375-hydrate	2015	Department of Chemistry, Pennsylvania State University, University Park, PA 16802, USA.; Pennsylvania State University, Schuylkill Campus, 200 University Drive, Schuylkill Haven, PA 17972, USA.; Pennsylvania State University, Schuylkill Campus, 200 Univer	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Acta crystallographica.Section E, Crystallographic communications Periodical, Abbrev. Acta Crystallogr.E.Crystallogr.Commun. Pub Date Free Form 1-Jan Volume 71 Issue Pt 1 Start Page 62 Other Pages 64 Notes LR: 20150225; JID: 101648987; OID: NLM: PMC4331885; OTO: NOTNLM; 2015/01/01 [ecollection]; 2014/11/09 [received]; 2014/12/01 [accepted]; epublish Place of Publication England ISSN/ISBN 2056-9890 Accession Number PMID: 25705452 Language eng SubFile Journal Article DOI 10.1107/S2056989014026425 [doi] Output Language Unknown(0) PMID 25705452 Abstract The asymmetric unit of the title compound, C18H18N2O2S.0.375H2O, has two independent organic mol-ecules (A and B) and 3/4 of a water mol-ecule distributed over three sites. In mol-ecule A, the 1,3-thia-zine ring is in a boat conformation, with the C atoms at the 2- and 5-positions out of the plane. The angle between the two phenyl rings is 51.70 (12) degrees . In mol-ecule B, the thia-zine ring is in a half-chair conformation, with the S atom forming the back of the half-chair. The angle between the two phenyl rings is 84.44 (14) degrees . The A mol-ecule features an intra-molecular N-Hcdots, three dots, centeredO hydrogen bond, which closes an S(5) ring motif. In the crystal, the corresponding N-H grouping of the B mol-ecule participates in an inter-molecular hydrogen bond to the A mol-ecule. The A mol-ecule participates in a C-Hcdots, three dots, centeredO inter-action back to the B mol-ecule, whilst the B mol-ecule features an intra-molecular C-Hcdots, three dots, centeredO link, which generates an S(10) loop. Descriptors Links Book Title Database Publisher Data Source Authors Yennawar,H.P., Singh,H., Silverberg,L.J. Original/Translated Title URL Date of Electronic 20150101 PMCID PMC4331885 Editors
A new liquid-phase microextraction method based on solidification of floating organic drop	2007	Department of Chemistry, School of Sciences, Tarbiat Modarres University, P.O. Box 14115-175, Tehran, Iran.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Analytica Chimica Acta Periodical, Abbrev. Anal.Chim.Acta Pub Date Free Form 7-Mar Volume 585 Issue 2 Start Page 286 Other Pages 293 Notes LR: 20131121; JID: 0370534; 0 (Alcohols); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Solvents); 0 (Water Pollutants, Chemical); 059QF0KO0R (Water); 2006/10/17 [received]; 2006/12/20 [revised]; 2006/12/21 [accepted]; 2007/01/12 [aheadofprint]; ppublish Place of Publication Netherlands ISSN/ISBN 1873-4324; 0003-2670 Accession Number PMID: 17386676 Language eng SubFile Journal Article; IM DOI S0003-2670(07)00003-7 [pii] Output Language Unknown(0) PMID 17386676 Abstract In the present study, a new and versatile liquid-phase microextraction method is described. This method requires very simple and cheap apparatus and also a small amount of organic solvent. Eight microliters of 1-undecanol was delivered to the surface of solution containing analytes and solution was stirred for a desired time. Then sample vial was cooled by inserting it into an ice bath for 5 min. The solidified 1-undecanol was transferred into a suitable vial and immediately melted; then, 2 microL of it was injected into a gas chromatograph for analysis. Some polycyclic aromatic hydrocarbons (PAHs) were used as model compounds for developing and evaluating of the method performance. Analysis was carried out by gas chromatography/flame ionization detection (GC/FID). Several factors influencing the microextraction efficiency, such as the nature and volume of organic solvent, the temperature and volume of sample solution, stirring rate and extraction time were investigated and optimized. The applicability of the technique was evaluated by determination of trace amounts of PAHs in environmental samples. Under the optimized conditions, the detection limits (LOD) of the method were in the range of 0.07-1.67 microg L(-1) and relative standard deviations (R.S.D.) for 10 microg L(-1) PAHs were 0.995) in a calibration range of 0.25-300.00 microg L(-1) was obtained. After 30 min extraction duration, enrichment factors were in the range of 594-1940. Finally, the proposed method was applied to the determination of trace amounts of PAHs in several real water samples, and satisfactory results were resulted. Since very simple devices were used, this new technique is affordable, efficient, and convenient for extraction and determination of low concentrations of PAHs in water samples. Descriptors Alcohols/chemistry, Calibration, Chemistry Techniques, Analytical/methods, Chemistry, Organic/methods, Chromatography, Gas/methods, Environmental Monitoring, Polycyclic Hydrocarbons, Aromatic/chemistry, Regression Analysis, Reproducibility of Results, Solvents, Temperature, Time Factors, Water/chemistry, Water Pollutants, Chemical/analysis Links Book Title Database Publisher Data Source Authors Khalili Zanjani,M. R., Yamini,Y., Shariati,S., Jonsson,J. A. Original/Translated Title URL Date of Electronic 20070112 PMCID Editors
Comparison of air-agitated liquid-liquid microextraction and ultrasound-assisted emulsification microextraction for polycyclic aromatic hydrocarbons determination in hookah water	2015	Department of Chemistry, Semnan University, Semnan, Iran.; Department of Chemistry, Semnan University, Semnan, Iran.; Department of Chemistry, Faculty of Science, Ilam University, Ilam, Iran.; Department of Chemistry, Semnan University, Semnan, Iran.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Journal of separation science Periodical, Abbrev. J.Sep.Sci. Pub Date Free Form Jul Volume 38 Issue 14 Start Page 2496 Other Pages 2502 Notes CI: (c) 2015; JID: 101088554; OTO: NOTNLM; 2014/11/21 [received]; 2015/02/27 [revised]; 2015/04/20 [accepted]; 2015/06/16 [aheadofprint]; ppublish Place of Publication Germany ISSN/ISBN 1615-9314; 1615-9306 Accession Number PMID: 25989415 Language eng SubFile Journal Article DOI 10.1002/jssc.201401267 [doi] Output Language Unknown(0) PMID 25989415 Abstract In this work, two disperser-free microextraction methods, namely, air-agitated liquid-liquid microextraction and ultrasound-assisted emulsification microextraction are compared for the determination of a number of polycyclic aromatic hydrocarbons in aqueous samples, followed by gas chromatography with flame ionization detection. The effects of various experimental parameters upon the extraction efficiencies of both methods are investigated. Under the optimal conditions, the enrichment factors and limits of detection were found to be in the ranges of 327-773 and 0.015-0.05 ng/mL for air-agitated liquid-liquid microextraction and 406-670 and 0.015-0.05 ng/mL for ultrasound-assisted emulsification microextraction, respectively. The linear dynamic ranges and extraction recoveries were obtained to be in the range of 0.05-120 ng/mL (R(2) >/= 0.995) and 33-77% for air-agitated liquid-liquid microextraction and 0.05-110 ng/mL (R(2) >/= 0.994) and 41-67% for ultrasound-assisted emulsification microextraction, respectively. To investigate this common view among some people that smoking hookah is healthy due to the passage of smoke through the hookah water, samples of both the hookah water and hookah smoke were analyzed. Descriptors Links Book Title Database Publisher WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Data Source Authors Rajabi,M., Bazregar,M., Daneshfar,A., Asghari,A. Original/Translated Title URL Date of Electronic 20150616 PMCID Editors

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