solid phase microextraction coupled with gas chromatography mass spectrometry multiple ion monitoring mode analysis
Determination of endocrine disrupting compounds in environmental samples using microextraction combined with gas chromatography mass spectrometry
Ngày tải lên :
16/09/2015, 17:12
... Liquid -phase Microextraction Coupled with Injection Port-Derivatization Gas Chromatography/ Mass Spectrometry, J CHROMATOGR A (2004), 1057 (1, 2): 163-169 [7] C Basheer, H K Lee, J P Obbard Analysis ... standard deviations SPE Solid- phase extraction SFE Supercritical fluid extraction SPME Solid- phase microextraction SIM Selective ion monitoring USEPA United States Environmental Protection Agency ... II Chapter 2: Analysis of Aqueous Microextraction Combined with GC/MS Samples using 2.1: Headspace Solid- Phase Microextraction with On-Fiber Derivatization 2.1 Introduction GC analysis of alkylphenols...
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DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY pdf
Ngày tải lên :
22/03/2014, 14:20
... Low -mass sensitivity 68
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Determination of EDTA in Water Samples by SPE-Gas Chromatography/Mass Spectrometry
Ngày tải lên :
05/09/2013, 10:15
... solutions were of analytical grade Milli-Q water was used in all experiments Gas chromatography/ mass spectrometry analysis Gas chromatography was carried out by using HP6890 series gas chromatography ... on the pretreatment of EDTA by using solid- phase extraction in the present study In comparison with evaporation using rotary evaporator, solid- phase extraction is simple, rapid, and efficient ... Vol 8, No.4, 2010 chromatography (Nowack et al., 1996; Kemmei et al., 2009), ion chromatography/ mass spectrometry (Bauer et al., 1999; Knepper et al., 2005), gas chromatography/ mass spetrometry...
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Gas Chromatography Mass Spectrometry doc
Ngày tải lên :
10/08/2014, 17:22
... sang phận in lưu kết Process Flow Schematic Sample injection Carrier gas (nitrogen or helium) Long Column (30 m) Detector (flame ionization detector or FID) Air Hydrogen Ưu Điểm Chỉ ... Nguồn Ion (ion source): o o o Sau qua cột sắc kí khí, hóa chất tiếp tục vào pha khối phổ Các phân tử phải qua luồng electrons chúng bị chia thành mảnh nhỏ tích điện dương Các mảnh gọi ion Điều ... dựa mô hình ion Dưới hình khối phổ Trục X khối lượng trục Y số lượng Trên hình ta thấy phân tử ban đầu có khối lượng Trên sơ đồ khối phổ hạt lớn gọi ion phân tử (molecular ion) Các hạt...
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current practice of gas chromatography mass spectrometry
Ngày tải lên :
06/10/2016, 09:28
... Instrumentation of Gas Chromatography Mass Spectrometry Principles and Instrumentation of Gas Chromatography Mass Spectrometry W M A Niessen Principles and Applications of Surface Ionization in Gas Chromatography Mass ... On-Line Solid- Phase Extraction–Capillary Gas Chromatography Mass Spectrometry for Water Analysis Thomas Hankemeier and Udo A Th Brinkman Gas Chromatography Mass Spectrometry in Occupational and ... Assessment with Some Applications Related to Environmental and Biological Monitoring of 1-Nitropyrene P T J Scheepers, R Anzion, and R P Bos Application of Solid- Phase Microextraction Gas Chromatography Mass...
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Phương pháp SPME và Ứng dụng (Solid-phase microextraction)
Ngày tải lên :
02/05/2014, 23:00
... Y.), 275 Ulrich, Solid- phase microextraction in biomedical analysis, Journal of Chromatography A, 902 (2000) 167-194 L.J.Krutz, S.A.Senseman, A.S.Sciumbato, Solid- phase microextraction for herbicide ... Application of solid- phase microextraction in analytical toxicology Anal Bioanal Chem., 388 (2007) 1393-1414 Vuckovic, D., E Cudjoe, D Hein, and J Pawliszyn Automation of Solid- Phase Microextraction ... Chai, M., Zhang, Z., Pawliszyn, J., Solid- Phase Microextraction: An Attractive Alternative, Environmental Lab.11 (1992) 10-15 Pawliszyn, J Solid Phase Microextraction : Theory and Practice (1997)...
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Báo cáo toán học: " Solid-phase microextraction for bioconcentration studies according to OECD TG 305" pdf
Ngày tải lên :
20/06/2014, 20:20
... microextraction techniques for pharmaceutical and biomedical analyses Anal Sci 2011, 27:893-905 Llompart M, Li K, Fingas M: Solid- phase microextraction and headspace solid- phase microextraction for ... J: Solid Phase Microextraction: Theory and Practice New York: Wiley-VCH; 1997 Pawliszyn J (Ed): Handbook of Solid Phase Microextraction Peking: Chemical Industry Press; 2009 Alpendurada MF: Solid- phase ... using solid- phase microextraction and GC/MS Environ Sci Technol 1994, 28:298-305 10 Nilsson T, Ferrari R, Facchetti S: Inter-laboratory studies for the validation of solid- phase microextraction...
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Giới thiệu Gas Chromatography Mass Spectometry pdf
Ngày tải lên :
02/07/2014, 09:20
... dựa mô hình ion Trên hình ta thấy phân tử ban đầu có khối lượng Trên sơ đồ khối phổ hạt lớn gọi ion phân tử (molecular ion) Các hạt nhỏ có khối lượng 1,2,3 gọi ion phân mảnh (fragment ions) Trong ... phổ A Nguồn Ion (ion source): Sau qua cột sắc kí khí, hóa chất tiếp tục vào pha khối phổ Các phân tử phải qua luồng electrons chúng bị chia thành mảnh nhỏ tích điện dương Các mảnh gọi ion Điều quan ... nghiên cứu thành phần chất không khí Bản chất GC-MS, tên gọi nó, kết hợp Sắc ký khí (Gas Chromatography) Khối phổ (Mass Spectometry) Ngưỡng phát phương pháp picogram (0.000000000001 gram) Tuy nhiên,...
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2D Modeling of thermokinetics coupled with heat and mass transfer in the reduction zone of a fixed bed downdraft biomass gasifier
Ngày tải lên :
01/08/2016, 09:31
... gas Fig Physical model of the gasification zone Model development 2.1 Model description The present model deals with the reduction zone (Dimensions given in Table 1) of a downdraft gasifier (tested ... main gasification reactions converting bio-char into producer gas The WatereGas shift reaction is an important homogenous reaction though its extent is low in the condition of fixed bed gasification ... steady state model of gas- char reactions in a downdraft biomass gasifier Sol Energy 2003;74:85e91 [7] Babu BV, Sheth NP Modeling and simulation of reduction zone of downdraft biomass gasifier: effect...
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liquid chromatography - mass spectrometry an introduction
Ngày tải lên :
11/04/2014, 06:58
... analyser maximum entropy methionine multiple- ion detection mass- analysed ion kinetic energy spectrometry multiple- reaction monitoring mass spectrometry Abbreviations, Acronyms and Symbols MS–MS ... V vol/vol Val mass spectrometry in combination with mass spectrometry (tandem mass spectrometry) multiple stages of tandem mass spectrometry National Institute of Health (USA) National Institute ... Electron Ionization 3.2.2 Chemical Ionization 3.2.3 Fast-Atom Bombardment 3.2.4 Matrix-Assisted Laser Desorption Ionization 3.2.5 Negative Ionization 3.3 Ion Separation 3.3.1 The Quadrupole Mass...
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![niessen - liquid chromatography - mass spectrometry 3e [lcms] (crc, 2006)](https://media.store123doc.com/images/document/14/ne/ea/medium_eaq1401870789.jpg)
niessen - liquid chromatography - mass spectrometry 3e [lcms] (crc, 2006)
Ngày tải lên :
04/06/2014, 15:33
... polymorphisms sustained off-resonance irradiation solid- phase extraction solid- phase microextraction selected-reaction monitoring solid- supported liquid-liquid extraction sewage treatment plant triacylglycerides ... free ions in the gas phase are amenable to mass analysis C Gas -phase electrolyte ions, e.g., NH4+, may be formed during these processes as well These ions may act as reagent gas ions in ion- molecule ... ionization point of view Attention is paid to specific aspects of ionization under LC–MS conditions In this respect, attention is paid to electron impact ionization (Ch 13), chemical ionization...
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Analysis of keto enol tautomers of curcumin by liquid chromatography mass spectrometry
Ngày tải lên :
01/07/2014, 13:22
... represents an impurity of curcumin with a different structure or another form of curcumin, after fractionation of peak 2, a portion of the fraction was subjected to analysis again The chromatogram ... N.E Jacobsen, B.N Timmermann, D.R Gang, Analysis of curcuminoids by positive and negative electrospray ionization and tandem mass spectrometry, Rapid Commun Mass Spectrom 20 (2006) 1001–1012 [18] ... [14] T.J Novak, R Helmy, I Santos, Liquid chromatography mass spectrometry using the hydrogen/deuterium exchange reaction as a tool for impurity identification in pharmaceutical process development,...
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Báo cáo khoa học: "Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry" pps
Ngày tải lên :
07/08/2014, 15:20
... it ion b eca u se t h e d et er m in a t ion m e t h od s b y ele ct r ochemical detection are very sensitive to environmental condition The determination method by gas chromatography- mass spectrometry ... molecule, the produced ions on mass spectra were the molecular related ion [M+H]+, two adduct ions [M+Na]+ and [M+K]+, and several fragmentation ions (Fig 3) The molecular ions, [M+H]+ at m / z ... re-equilibration with 100% B for min, post-run with 100% B for 10 min, until the next sample injection The nebulizer gas was flowed at 45 p.s.i., 350℃ and 9.0 l/min and quadrupole was heated to 100℃ Mass...
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Báo cáo khoa học: "Determination of Roxithromycin by Liquid Chromatography/ Mass Spectrometry after Multiple-Dose Oral Administration in Broilers" pdf
Ngày tải lên :
07/08/2014, 17:22
... regression analysis of the log-transformed tissue concentrations, and was determined at the time when the Determination of Roxithromycin by Liquid Chromatography/ Mass Spectrometry after Multiple- Dose ... phase consisted of 50 mM ammonium acetate and acetonitrile (2:8, v/v) The mass spectrometer was run in the positive mode and selective ion monitoring mode focused on m/ z = 837.5 The extraction ... detection with precolumn derivatization procedures requires long separation times and is less sensitive than LC/MS In addition, fluorimetric detection is limited for simultaneous determination...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 6
Ngày tải lên :
16/09/2015, 17:13
... exhibited better recoveries than SFE Liquid chromatography- atmospheric pressure ionization- ion trap mass spectrometry was used to investigate the chemical degradation behavior of N-methylcarbamate in ... liquid chromatography- atmospheric pressure chemical ionization- ion trap mass spectrometry, coupled to microwave-assisted extraction technique, was also been applied to analyze the residues of ... irradiation sources Based on kinetic studies, propoxur was found to degrade more rapidly at higher light exposure and pH Furthermore, liquid chromatography- atmospheric pressure chemical ionization-...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 5
Ngày tải lên :
16/09/2015, 17:13
... Full-scan mass range of m/z 50 to 250 SIM mode (m/z 60) SIM mode (m/z 151 and 210) in the negative and positive ion detection modes, respectively 5.3 RESULTS AND DISCUSSION 5.3.1 LC-MS Analysis ... chemical ionization -ion trap mass spectrometry, coupled to microwave-assisted extraction technique, together with the orthogonal array design for optimization of the MAE conditions To apply these techniques ... case-by-case situation Table 5-6 Variance analysis table in the OA (27) matrix for the optimization of MAE from sea lettuce A B C D Extraction solvent Extraction temperature Extraction time Solvent...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 4
Ngày tải lên :
16/09/2015, 17:13
... A (extraction solvent), factor B (extraction temperature), factor C (extraction time) and the two-variable interaction B х C (interaction between extraction temperature and extraction time) are ... Extraction temperature; C: Extraction time; D: Pressure According to previous experience and intuition, a two-variable interactions to be considered was B × C (interaction between different extraction ... Experimental design for MASE optimization With MAE, extraction solvents, extraction temperature, time and solvent volume appeared to be the major parameters affecting extraction efficiency In this study,...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 3
Ngày tải lên :
16/09/2015, 17:13
... simultaneous determination of carbamate pesticides [7, 9-12] In addition, with the introduction of ion- trap mass analyzers (ITMS), higher sensitivity and accuracy of the structural information on analytes ... degradation, most of it deals with the biochemical transformation rather than with physico-chemical transformations, however [14] The present study was aimed at monitoring the degradation kinetics ... For the first time, liquid chromatography- atmospheric pressure chemical ionization -ion trap mass spectrometry (LC-APCI-ITMS) was used to investigate the chemical degradation behavior of propoxur...
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