WTS database

Title	Pub Year	Author Sort ascending	SearchLink
Ultrasound-assisted emulsification microextraction method based on applying low density organic solvents followed by gas chromatography analysis for the determination of polycyclic aromatic hydrocarbons in water samples	2009	Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.	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 25-Sep Volume 1216 Issue 39 Start Page 6673 Other Pages 6679 Notes JID: 9318488; 0 (Organic Chemicals); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Solvents); 0 (Water Pollutants, Chemical); 2009/06/01 [received]; 2009/07/30 [revised]; 2009/08/04 [accepted]; 2009/08/07 [aheadofprint]; ppublish Place of Publication Netherlands ISSN/ISBN 1873-3778; 0021-9673 Accession Number PMID: 19674752 Language eng SubFile Evaluation Studies; Journal Article; IM DOI 10.1016/j.chroma.2009.08.001 [doi] Output Language Unknown(0) PMID 19674752 Abstract In this study, a fast, simple and efficient ultrasound-assisted emulsification microextraction (USAEME) method was successfully developed based on applying low density organic solvents. Fourteen microliters of toluene was injected slowly into a 12 mL home-designed centrifuge glass vial containing an aqueous sample that was located inside the ultrasonic water bath. The formed emulsion was centrifuged and 2 microL of separated toluene (about 4 microL) was injected into a gas chromatographic system equipped with a flame ionization detector (GC-FID) for analysis. Some polycyclic aromatic hydrocarbons (PAHs) were selected as model compounds for developing the method and evaluating its performance and to compare the efficiency of the proposed method with previously reported techniques. Several factors influencing the emulsification, extraction and collection efficiency such as the nature and volume of organic solvent, emulsification-extraction temperature, ionic strength and equilibrium and centrifugation times were investigated and optimized. Under the optimum conditions, preconcentration factors (PFs) in a range of 1776-2714 were obtained. The performance of the proposed method was studied in terms of linear dynamic range (LDRs from 0.05 to 100 microg L(-1)), linearity (R(2) > or = 0.994), precision (repeatability: RSD% < or = 7.9, reproducibility: RSD% < or = 14.6) and extraction percents (59.2-90.5%). Limits of detection (LODs) in the range of 0.02-0.05 microg L(-1) were obtained for different PAHs. The applicability of the proposed method was evaluated by the extraction and determination of PAHs from several natural water samples. Descriptors Chemical Fractionation/methods, Chromatography, Gas, Organic Chemicals/chemistry, Polycyclic Hydrocarbons, Aromatic/analysis, Solvents/chemistry, Ultrasonics, Water Pollutants, Chemical/analysis Links Book Title Database Publisher Data Source Authors Saleh,A., Yamini,Y., Faraji,M., Rezaee,M., Ghambarian,M. Original/Translated Title URL Date of Electronic 20090807 PMCID Editors
An aniline-based fiber coating for solid phase microextraction of polycyclic aromatic hydrocarbons from water followed by gas chromatography-mass spectrometry	2007	Department of Chemistry, Sharif University of Technology, Tehran, Iran. bagheri@sharif.edu	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 8-Jun Volume 1152 Issue 2-Jan Start Page 168 Other Pages 174 Notes LR: 20090115; JID: 9318488; 0 (Aniline Compounds); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Water Pollutants, Chemical); 0 (polyaniline); 2006/10/02 [received]; 2007/01/28 [revised]; 2007/02/02 [accepted]; 2007/02/08 [aheadofprint]; ppublish Place of Publication Netherlands ISSN/ISBN 0021-9673; 0021-9673 Accession Number PMID: 17316658 Language eng SubFile Journal Article; Research Support, Non-U.S. Gov't; IM DOI S0021-9673(07)00255-5 [pii] Output Language Unknown(0) PMID 17316658 Abstract A fiber coating from polyaniline (PANI) was electrochemically prepared and employed for solid phase microextraction (SPME) of some polycyclic aromatic hydrocarbons (PAHs) from water samples. The PANI film was directly electrodeposited on the platinum wire surface in sulfuric acid solution using cyclic voltammetry (CV) technique. The applicability of this coating was assessed employing a laboratory-made SPME device and gas chromatography with mass spectrometry (GC-MS) for the extraction of some PAHs from the headspace of aqueous samples. Application of wider potential range in CV led to a PANI with more stability against the temperature. The homogeneity and the porous surface structure of the film were examined by the scanning electron microscopy (SEM). The study revealed that this polymer is a suitable SPME fiber coating for extracting the selected PAHs. Important parameters influencing the extraction process were optimized and an extraction time of 40 min at 40 degrees C gave maximum peak area, when the aqueous sample was added with NaCl (20%, w/v). The synthesis of the PANI can be carried out conveniently and in a reproducible manner while it is rather inexpensive and stable against most of organic solvents. The film thickness of PANI can be precisely controlled by the number of CV cycles. The resulting thickness was roughly 20 microm after 20 cycles. At the optimum conditions, the relative standard deviation (RSD) for a double distilled water spiked with selected PAHs at ppb level were 8.80-16.8% (n = 3) and detection limits for the studied compounds were between 0.1-6 pg mL(-1). The performance of PANI was, also, compared with a commercial solid coated-based SPME fiber, carbowax/divinylbenzene (CW/DVB), under similar experimental conditions. Descriptors Aniline Compounds/chemistry, Gas Chromatography-Mass Spectrometry/methods, Microscopy, Electron, Scanning, Osmolar Concentration, Polycyclic Hydrocarbons, Aromatic/isolation & purification, Solid Phase Microextraction/instrumentation, Temperature, Water Pollutants, Chemical/isolation & purification Links Book Title Database Publisher Data Source Authors Bagheri,H., Babanezhad,E., Es-haghi,A. Original/Translated Title URL Date of Electronic 20070208 PMCID Editors
(2S)-2-(4-Ethyl-2,3-dioxopiperazine-1-carboxamido)-2-(4-hy-droxy-phen-yl)acetic acid	2010	Department of Chemistry, Shandong Normal University, Jinan 250014, People's Republic of China.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Acta crystallographica.Section E, Structure reports online Periodical, Abbrev. Acta Crystallogr.Sect.E.Struct.Rep.Online Pub Date Free Form 3-Jul Volume 66 Issue Pt 8 Start Page o1907 Other Pages 8 Notes LR: 20111209; JID: 101089178; OID: NLM: PMC3007271; 2010/05/31 [received]; 2010/06/28 [accepted]; 2010/07/03 [epublish]; epublish Place of Publication England ISSN/ISBN 1600-5368; 1600-5368 Accession Number PMID: 21588240 Language eng SubFile Journal Article DOI 10.1107/S1600536810025262 [doi] Output Language Unknown(0) PMID 21588240 Abstract There are two mol-ecules in the asymmetric unit of the title compound, C(15)H(17)N(3)O(6). The 2,3-dioxopiperazine ring adopts a half-chair conformation with torsion angles of -7.6 (4) and 35.1 (4) degrees in one mol-ecule, and 5.3 (4) and 45.4 (4) degrees in the other mol-ecule. In the crystal structure, the carb-oxy groups are involved in classical inversion-related O-Hcdots, three dots, centeredO hydrogen bonds, which link the mol-ecules into centrosymmetric dimers. These dimers are further linked by inter-molecular O-Hcdots, three dots, centeredO and C-Hcdots, three dots, centeredO hydrogen bonds. Each independent mol-ecule also exhibits an intra-molecular N-Hcdots, three dots, centeredO hydrogen bond. The H atoms of the carb-oxy groups are disordered over two positions, with refined site-occupancy factors of 0.5. Descriptors Links Book Title Database Publisher Data Source Authors Wang,Q., Hu,L., Ma,J. P., Guo,D. S. Original/Translated Title URL Date of Electronic 20100703 PMCID PMC3007271 Editors
Determination of polycyclic aromatic hydrocarbons in Persian Gulf and Caspian Sea: gold nanoparticles fiber for a head space solid phase micro extraction	2013	Department of Chemistry, Shahr-e-Rey Branch, Islamic Azad University, P. O. Box 18735-334, Tehran, Iran.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Bulletin of environmental contamination and toxicology Periodical, Abbrev. Bull.Environ.Contam.Toxicol. Pub Date Free Form Mar Volume 90 Issue 3 Start Page 291 Other Pages 295 Notes JID: 0046021; 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Water Pollutants, Chemical); 7440-57-5 (Gold); 2012/09/18 [received]; 2012/11/17 [accepted]; 2012/11/25 [aheadofprint]; ppublish Place of Publication United States ISSN/ISBN 1432-0800; 0007-4861 Accession Number PMID: 23183967 Language eng SubFile Journal Article; IM DOI 10.1007/s00128-012-0906-2 [doi] Output Language Unknown(0) PMID 23183967 Abstract A gold nanoparticles modified fused silica fiber was developed and used for the head space solid phase micro-extraction (HS-SPME) of polycyclic aromatic hydrocarbons (PAHs), including naphthalene, anthracene, acenaphthylene, phenanthrene, fluoranthene and pyrene. The effects of different parameters influencing the extraction efficiency including extraction temperature, extraction time, ionic strength, stirring rate and sample volume were examined and optimized. Linear ranges of 1-300 mug L(-1) for naphthalene, 0.5-250 mug L(-1) for anthracene, acenaphthylene and phenanthrene and 0.05-200 mug L(-1) for fluoranthene and pyrene were obtained. Detection limits were in the range of 10-200 mug L(-1). Single fiber repeatability and fiber to fiber reproducibility were less than 2.5 %-6.0 % and 8.5 %-13.6 %, respectively. Seawater samples were analyzed as real samples and good recoveries (91.9 %-105.3 %) were obtained for target analytes. Descriptors Links Book Title Database Publisher Data Source Authors Karimi,M., Aboufazeli,F., Zhad,H.R., Sadeghi,O., Najafi,E. Original/Translated Title URL Date of Electronic 20121125 PMCID Editors
A novel coating based on carbon nanotubes/poly-ortho-phenylenediamine composite for headspace solid-phase microextraction of polycyclic aromatic hydrocarbons	2013	Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 76169-133, Kerman, Iran.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Talanta Periodical, Abbrev. Talanta Pub Date Free Form 15-Apr Volume 108 Issue Start Page 66 Other Pages 73 Notes CI: Copyright (c) 2013; JID: 2984816R; 0 (Nanotubes, Carbon); 0 (Phenylenediamines); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Water Pollutants, Chemical); 0 (poly(o-phenylenediamine)); 12597-68-1 (Stainless Steel); 2013/01/08 [received]; 2013/02/14 [revi Place of Publication Netherlands ISSN/ISBN 1873-3573; 0039-9140 Accession Number PMID: 23601871 Language eng SubFile Journal Article; IM DOI 10.1016/j.talanta.2013.02.040 [doi] Output Language Unknown(0) PMID 23601871 Abstract A novel nanocomposite coating made of poly-o-phenylenediamine (PoPD) and oxidized multiwalled carbon nanotubes (MWCNTs) was electrochemically prepared for the first time on stainless steel wire. Subsequently, it was applied to headspace solid-phase microextraction (HS-SPME) and gas chromatographic analysis of biphenyl and seven polycyclic aromatic hydrocarbons (PAHs). The effects of polymerization potential, polymerization time, concentration of o-phenylenediamine and oxidized MWCNTs were investigated on the coating process. The fiber coating was carried out easily and in a reproducible manner, and the produced fiber was stable at high temperatures. The surface morphology of the coating was examined by scanning electron microscopy (SEM). The effects of various parameters on the efficiency of HS-SPME process, such as desorption temperature, desorption time, extraction temperature, extraction time and ionic strength were also studied. Under optimized conditions, the calibration graphs were linear in the range of 0.1-300 ng mL(-1), and the detection limits for biphenyl and PAHs studied were between 0.02 and 0.09 ng mL(-1). The intra-day and inter-day relative standard deviations obtained at 5 ng mL(-1) concentration level (n=5), using a single fiber, were 3.2-7.8% and 5.2-9.3%, respectively. The fiber-to-fiber RSD% (n=3) were 6.2-11.3% at 5 ng mL(-1). The proposed HS-SPME method was successfully applied for the analysis of PAHs in water samples. Descriptors Links Book Title Database Publisher Elsevier B.V Data Source Authors Behzadi,M., Noroozian,E., Mirzaei,M. Original/Translated Title URL Date of Electronic 20130304 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
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
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
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
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

E-mail