Detection mass-selective

The influence of soil ageing on the recovery of POPs from spiked soil samples was also assessed. Spiked lettuce samples were subjected to in vitro gastrointestinal extraction to assess the bioavailability of Endosulfan compounds. All samples (soil and lettuce) were extracted using pressurised fluid extraction and analysed using gas chromatography with mass selective detection. 

Figure 2.12 Schematic representation of an on-line SPE-GC system consisting of three switching valves (VI-V3), two pumps (a solvent-delivery unit (SDU) pump and a syringe pump) and a GC system equipped with a solvent-vapour exit (SVE), an MS instrument detector, a retention gap, a retaining precolumn and an analytical column. Reprinted from Journal of Chromatography, AIIS, A. J. H. Eouter et al, Analysis of microcontaminants in aqueous samples hy fully automated on-line solid-phase extraction-gas chromatography-mass selective detection , pp. 67-83, copyright 1996, with permission from Elsevier Science.

A. J. H. Louter, C. A. van Beekvelt, P Cid Montanes, J, Slobodnik, J. J. Vreuls and U. A. Th Brinkman, Analysis of microcontaminants in aqueous samples by fully automated on-line solid-phase exti action-gas cliromatography-mass selective detection , 7. Chromatogrl2S 67-83 (1996). 

Stan H-J. 1989. Application of capillary gas chromatography with mass selective detection to pesticide residue analysis. J Chromatogr 467 85-98. 

Leung AM, McDonough DM, West CD. 1998. Determination of endosulfans in soil/sediment samples from Point Mugu, Oxnard, CA, using capillary gas chromatography/mass selective detection (CC/MSD). Environmental Monitoring and Assessment 50(l) 85-94. 

P 24] The nitration of naphthalene was carried out with dissolved or in situ generated N2O5 gas [37]. The temperatare was set to -10 to 50 °C and residence times to 15—45 s. The reaction mixtare processed in the micro reactor was quenched with water, extracted and analyzed by HPLC or GC with mass-selective detection. 

Gas chromatography with electron capture and/or mass-selective detection... 

Visible wavelength spectrophotometry Mass selective detection Nitrogen-phosphorus detection Electron capture detection UV detection... 

Leenheers, L.H., Breugel, D.G., Ravensberg, J.C., Meuling, W.J.A., and Jongen, M.J.M. (1992) Determination of 2-isopropoxyphenol in urine using capillary gas chromatography and mass-selective detection, ]. Chromatography, 578 189-194. 

There are multiple tools and technologies being developed to assist in metabolic profiling. Many of the approaches contain mass selective detection that is incorporated due to its enhanced sensitivity and selectivity. Several good overviews... 

HPLC is a universal separation technique that is capable of separating both volatiles and non-volatiles without the need for derivatization. We are developing methods that employ both on-line photodiode array (PDA) detection and mass selective detection, HPLC/PDA/MS. This approach also utilizes an ion-trap mass... 

The utility of mass selective detection is greatest when analyzing compounds that do not contain chromophores or when structural information is needed for chemical identification. Triterpene saponins contain very weak chromophores and have long been associated with a variety of biological activities including... 

Ritsema R, Cofino WP, Frintop PCM, et al. 1989. Trace-level analysis of phthalate esters in surface water and suspended particulate matter by means of capillary gas chromatography with electron-capture and mass-selective detection. Chemosphere 18 2161-2175. 

Nitrophenols in fog and atmospheric particles were determined by GC of the underiva-tized compounds and their corresponding acetate esters. Four fused-silica columns were used with three alternative detection modes, namely mass-selective detection, nitrogen-specific detection and ECD. GC-ECD of the acetate derivatives gave the best results501. A capillary GC-UVD method was developed for the determination of small amounts of nitrophenols present in the environment. The method was compared with HPLC-UVD from the point of view of selectivity and sensitivity. LOD for GC were about one-tenth of those for HPLC502. 

Analytical methods for determining disulfoton in environmental samples are reported in Table 6-2. The steps included in the methods are solvent extraction, purification and fractionation, and gas chromatographic analysis. Other analytical techniques, including capillary gas chromatography with mass selective detection (Stan 1989), high-performance liquid chromatography with either mass spectrometric (MS) or MS-MS detection (Betowski and Jones 1988), have been used to determine disulfoton in environmental samples. 

Yamashita S, Ozawa R, Yamaguchi K, et al. 1992. Analysis of volatile organic compounds in air by gas chromatography with thermal desorption cold- trap injection and atomic emission and mass selective detection. Journal of High Resolution Chromatography 15 549-551. 

Fiamegos, Y.C. et al.. Analytical procedure for the in-vial derivatization-extraction of phenolic acids and flavonoids in methanolic and aqueous plant extracts followed by gas chromatography with mass-selective detection, J. Chromatogr. A, 1041, 11, 2004. 

Heavner, D. L., M. W. Ogden, and P. R. Nelson, Multisorbent Thermal Desorption/Gas Chromatography/Mass Selective Detection Method for the Determination of Target Volatile Organic Compounds in Indoor Air, Environ. Sci. Technol, 26, 1737-1746 (1992). 

In combination with mass-selective detection (MIM mode), this technique may be ideal for quantitation of trace compounds from complex mixtures. But one should note that labelled internal standards may be discriminated by chemical and/or physical procedures (extraction, distillation, chromatography, derivati-sation). 

Triethanolamine can be determined in metalworking and cutting fluids by gas chromatography-mass selective detection of silylated derivatives, by isotachophoresis, by capillary zone electrophoresis with indirect ultraviolet detection, and by spectrophotometry (Kenyon et al, 1993 Fernando, 1995 Schubert et al, 1996 Sollenberg, 1997) and in cosmetics and pharmaceuticals by ion-exclusion chromatography and by reversed-phase high performance liquid chromatography (Fukui et al, 1992 Maurer etal, 1996). 

Static headspace GC involves heating the sample in an air-tight environment until the volatile lipids in the food reach an equilibrium with those in the surrounding air. The air above the sample (headspace) is then sampled and analyzed. Flame ionization detection (GC-FID) can be used for quantification and mass-selective detection (GC-MS) can be used for compound identification. This protocol also outlines semiquantitative and quantitative approaches for determination of volatile lipid concentration, and is particularly designed for analysis of a meat sample. 

MOC MS MSD MSZ material(s) of construction mass spectroscopy mass selective detection magnesia-stabilized zirconia... 

Soleas GJ, Yan J, Goldberg DM. 2001b. Ultrasensitive assay for three polyphenols (catechin, quercetin and resveratrol) and their conjugates in biological fluids utilizing gas chromatography with mass selective detection. J Chromatogr B Biomed Sci Appl 757 161-172. 

Albanis, T.A. and D.G. Hela (1995). Multi-residue pesticide analysis in environmental water samples using solid-phase extraction discs and gas chromatography with flame thermionic and mass-selective detection. J. of Chromatogr. A, 707 283-292. 

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