Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Online coupling

T. Hyotylainen, K. Jauho and M-L. Riekkola, Analysis of pesticides in red wines by online coupled reversed phase liquid clir omatogr aphy with a vaporizer/precolumn solvent split/gas dischar ge interface , 7. Chromatogr. 813 113-119(1997). [Pg.43]

K. Burger, Online coupling HPLC-AMD (automated multiple development) , Awa/ytw 18 1113-1116(1990). [Pg.196]

H. J. Goites, G. E. Bormett and J. D. Graham, Quantitative polymer additive analysis by multidimensional cliromatography using online coupled microcolumn size exclusion cliromatography as a preliminary separation , 7. Microcolumn Sep. 4 51 - 57 (1992). [Pg.332]

In recent years, much effort has been devoted to developing HPLC-MS methods for natural compounds. The main difficulty lies in the different operating conditions of HPLC and MS. While HPLC operates using high flow rates, high pressures, and liquid phases near room temperature, MS uses low flow rates, high vacuum, and a gas phase ion analyzer. Various interfaces allow for online coupling of these two... [Pg.467]

Seubeet a, and Nowak M (1998) Trace analysis of bromate in drinking waters by means of online coupling IC-ICP-MS. Fresenius J Anal Chem 360 777-780. [Pg.109]

Principles and Characteristics As mentioned already (Section 3.5.2) solid-phase microextraction involves the use of a micro-fibre which is exposed to the analyte(s) for a prespecified time. GC-MS is an ideal detector after SPME extraction/injection for both qualitative and quantitative analysis. For SPME-GC analysis, the fibre is forced into the chromatography capillary injector, where the entire extraction is desorbed. A high linear flow-rate of the carrier gas along the fibre is essential to ensure complete desorption of the analytes. Because no solvent is injected, and the analytes are rapidly desorbed on to the column, minimum detection limits are improved and resolution is maintained. Online coupling of conventional fibre-based SPME coupled with GC is now becoming routine. Automated SPME takes the sample directly from bottle to gas chromatograph. Split/splitless, on-column and PTV injection are compatible with SPME. SPME can also be used very effectively for sample introduction to fast GC systems, provided that a dedicated injector is used for this purpose [69,70],... [Pg.437]

On-line NPLC-GC-FID and/or FUR analysis has been used in discriminating between paraffin waxes and paraffin oils present in, or migrating between, food packaging and food simulants FID was used for quantitation [967]. In a typical application, online coupled LC-GC-F1D has also been used for the analysis of food contamination by mineral oil from printed cardboard [968]. The technique has revealed that many foods are contaminated with mineral oil products. Grob et al. [969] have determined mineral oil in canned food by on-line LC-LC-GC-F1D. DEHP was determined in salad oil by means of conventional LC-GC [970]. HPLC-GC-MS/MS (ion trap) can serve highly useful purposes in areas of applications such as impurity... [Pg.554]

Venema, E., deLeeuw, P., Rraak, J.C., Poppe, H., Tijssen, R. (1997). Polymer characterization using online coupling of thermal field flow fractionation and hydrodynamic chromatography. J. Chromatogr. A 765(2), 135-144. [Pg.125]

Ceccato, A., Boulanger, B., Chiap, P., Hubert, P., Crommen, J. (1998). Simultaneous determination of methylphenobarbital enantiomers and Phenobarbital in human plasma by online coupling of an achiral precolumn to a chiral liquid chromatographic column. J. Chromatogr. A 819, 143-153. [Pg.339]

Rojkovicova, T., Lehotay, J., Cizmarik, J. (2003h). Kinetic study of derivatives of phenylcar-hamic acid enantiomers in rabbit blood serum using an online coupled column liquid chromatographic system. Pharmazie 58, 483-486. [Pg.343]

The previous model setup included an identical horizontal resolution for ocean and atmosphere, and online coupling was implemented in the ECHAM submodel with an exchange rate of 3 hours. In the current model setup atmosphere and ocean are coupled online using the Ocean-Atmosphere-Sea Ice-Soil (OASIS) coupler [Valcke et al (2004)] with a coupling time step of one day. OASIS passes boundary condi-... [Pg.21]

Online coupling of flash-vacuum pyrolysis and mass spectrometry was applied to 3,4-dicyano-l,2,5-oxadiazole-2-oxide (dicyanofuroxan). The 1,2,5-oxadiazole is almost quantitatively pyrolyzed at 500-600 °C. Using collisional activation, the main pyrolysis products were identified as NCCNO and (CN)2 <1997BSB545>. [Pg.325]

Niederlander H.A.G. et al., 2006. High throughtput therapeutic drug monitoring of clozapine and metabolites in serum by online coupling of solid phase extraction with liquid chromatography-mass spectrometry. J Chromatogr B 834 98. [Pg.296]

In standard FAB, the surface of the matrix solution is depleted of analyte and suffers from radiational damage during elongated measurements. Refreshment of the surface proceeds by diffusion (limited by the viscosity of the matrix) or evaporation. Continuous-flow fast atom bombardment (CF-FAB) continuously refreshes the surface exposed to the atom beam. [107,108] The same effect is obtained in slightly different way by the frit-fast atom bombardment (frit-FAB) technique. [109,110] In addition, both CF-FAB and frit-FAB can be used for online-coupling of liquid chromatography (LC, Chap. 12) [111] or capillary electrophoresis (CE) to a FAB ion source. [112]... [Pg.395]

Til. Ozaki, H., Itou, N., Terabe, S., Takada, Y., Sakairi, M., and Koizumi, H. (1995). Micellar electrokinetic chromatography mass-spectrometry using a high-molecular-mass surfactant - online coupling with an electrospray-ionization interface.. Chromatogr. A 716, 69—79. [Pg.312]

Weissinger, E. M., Hertenstein, B., Mischak, H., and Ganser, A. (2005). Online coupling of capillary electrophoresis with mass spectrometry for the identification of biomarkers for clinical diagnosis. Expert Rev. Proteomics 2, 639—647. [Pg.508]

The universal calibration, derived from GPC viscosimetry online coupling, has further confirmed the predicted molecular weights. Absolute verification of this calibration principle, which neglects differences in viscosity of molecules of equal molecular weight but with different architectures, is still underway [16]. [Pg.49]

A photometric flow-through sensor for the determination of carbamate pesticides (carbofuran, propoxur and carbaryl) based on similar principles as regards the detector and sensor used (a diode array spectrophotometer and a flow-cell packed with C,g resin, respectively) was employed to monitor the formation of the products resulting from hydrolysis of the analytes and online coupling of the respective phenols with diazotized sulphanilic acid. This... [Pg.225]

Other applications include the online coupling of capillary isotachophoresis and CZE for the quantitative determination of flavonoids in Hypericum perforatum (Guttiferae) leaves and flowers. This method involved the concentration and preseparation of the flavonoid fraction before introduction into the CZE capillary. The limit of detection for quercetin 3-0-glycosides was 100 ng/ml. ... [Pg.30]

Capillary Gas Chromatography—Isotope Ratio Mass Spectrometry Techniques 395 Table "VIA IRMS online coupling techniques [52]... [Pg.395]

Asche S, Beck T, Hener U, Mosandl A (2000) Multidimensional gas chromatography, online coupled with isotope ratio mass spectrometry (MDGC-IRMS) a new technique for analytical authentication of genuine flavour components. In Frontiers of Flavour Science. DFA, Garching... [Pg.406]

See other pages where Online coupling is mentioned: [Pg.10]    [Pg.251]    [Pg.131]    [Pg.260]    [Pg.187]    [Pg.188]    [Pg.189]    [Pg.189]    [Pg.189]    [Pg.191]    [Pg.203]    [Pg.367]    [Pg.124]    [Pg.181]    [Pg.226]    [Pg.34]    [Pg.95]    [Pg.105]    [Pg.3]    [Pg.379]    [Pg.224]    [Pg.258]    [Pg.89]    [Pg.89]    [Pg.382]    [Pg.190]    [Pg.379]    [Pg.398]    [Pg.406]    [Pg.322]   


SEARCH



Coupled online

© 2024 chempedia.info