Mass spectrometric determination

GAS CHROMATOGRAPHIC - MASS SPECTROMETRIC DETERMINATION OF INORGANIC HYDRIDES, PERMANENT GASES AND HYDROCARBONS IN HIGH PURITY SILANE... 

Elements with 1 predominant isotope can also, potentially, permit very precise atomic weight determinations since variations in isotopic composition or errors in its determination have a correspondingly small effect on the mass-spectrometrically determined value of the atomic weight. Nine elements have 1 isotope that is more than 99% abundant (H, He, N, O, Ar, V, La, Ta... 

Figure 5,39 Structures of various fungicides used in the control of post-harvest decay in citrus fruits. Reprinted from J. Chrormtogr., A, 912, Fernandez, M., Rodriguez, R., Pico, Y. and Manes, J., Liquid chromatographic-mass spectrometric determination of post-harvest fungicides in citrus fruits , 301-310, Copyright (2001), with permission from Elsevier Science.

CHANG H 0, CHURCHWELL M I, DELCLOS K B, NEWBOLD, DOERGE D R (2000) Mass spectrometric determination of genistein tissue distribution in diet-exposed Sprague-Dawley rats. J Nutr. 130 1963-70. 

Gas-chromatographic determination for plant materials liquid chromatography/mass spectrometric determination for water and soil... 

Matejicek D, Houserova P, Kuban V (2007) Combined isolation and purification procedures prior to the high-performance liquid chromatographic-ion-trap tandem mass spectrometric determination of estrogens and their conjugates in river sediments. J Chromatogr A 1171 (l-2) 80-89... 

Muino, M.A.F. and J.S. Lozano. 1991. Mass spectrometric determination of pentachlorophenol in honey. Anal. Chim. Acta 247 121-123. 

Alford-Stevens, A.L., T.A. Bellar, J.W. Eichelberger, and W.L. Budde. 1986. Characterization of commercial Aroclors by automated mass spectrometric determination of polychlorinated biphenyls by level of chlorination. Anal. Chem. 58 2014-2022. 

Christiaens B. et al., 2004. Fully automated method for the liquid chromatographic-tandem mass spectrometric determination of cyproterone acetate in human plasma using restricted access material for online sample clean-up, J Chromatogr A 1056. 

Schellen A. et al., 2000. High throughput online solid phase extraction/tandem mass spectrometric determination of paclitaxel in human serum. Rapid Commun Mass Spectrom 14 230. 

R. S. Houk, V. A. Fassel, G. D. Flesch, H. J. Svec, A. L. Gray, and C. E. Taylor. Inductively Coupled Argon Plasma as an Ion Source for Mass Spectrometric Determination of Trace Elements. Anal. Chem., 52(1980) 2283-2289. 

Goossens J, Moens L, Dams R. Inductively coupled plasma mass spectrometric determination of heavy metals in soil and sludge candidate reference materials. Anal. Chim. Acta 1995 304 307-315. 

Alford Stevens et al. [49] carried out a multi-laboratory study of automated gas chromatography-mass spectrometric determinations of polychlorinated biphenyls in soil. The influence of various factors on the accuracy of analytical results were studied. Shaker extraction for 12.5h followed by Florisil chromatography were demonstrated to be the most reliable methods for extraction and clean-up. 

Representative multiple ion mass chromatograms of soil samples are presented in Fig. 5.4. These gas chromatography-mass spectrometric determinations of polychlorodibenzo-p-dioxin and polychlorodibenzofurans, and non-ortho polychlorobiphenyls in differing types of samples serve to exemplify the versatility of the procedure for such analyses. The gas chromatography-mass spectrometric data were usually uncluttered by extraneous components, and interpretation of the data was routinely straightforward. 

Miller YM, Ustinov VI, Artemov YM (1966) Mass spectrometric determination of calcium isotope variations. Geochem Inter 3 929-933... 

Cui, J.-F., Bjorkhem, 1., and Eneroth, P. (1997). Gas chromatographic-mass spectrometric determination of 20(S)-protopanaxadiol and 20(S)-protopanaxatriol for study on human urinary excretion of ginsenosides after ingestion of ginseng preparations. /. Chromatogr. B 689, 349-355. 

Caprioli, R.M. Fan, T. High Sensitivity Mass Spectrometric Determination of Peptides Direct Analysis of Aqueous Solutions. Biochem. Biophys. Res. Commun. 1986,141, 1058-1065. 

Yang, C. Henion, J.D. Atmospheric Pressure Photoionization Liquid Chromatographic-Mass Spectrometric Determination of Idoxifene and Its Metabolites in Human Plasma. J. Chromatogr. A 2002, 970,155-165. 

Sweeley, C.C. Elliot, W.H. Fries, I. Ry-hage, R. Mass Spectrometric Determination of Unresolved Components in Gas Chromatographic Effluents. Anal. Chem. 1966,55, 1549-1553. 

Arinobu T, Hattori H, Iwai M, Ishii A, Kumazawa T, et al. 2002. Liquid chromatographic-mass spectrometric determination of haloperidol and its metabolites in human plasma and urine. J Chromatogr B Analyt Technol Biomed Life Sci 776(1) 107-113. 

Koga D, Santa T, Fukushima T, Homma H, Imai K. 1997. Liquid chromatographic-atmospheric pressure chemical ionization mass spectrometric determination of ananda-mide and its analogs in rat brain and peripheral tissues. J Chromatogr B Biomed Sci Appl 690 7. 

Musshoff F, Lachenmeier DW, Kroener L, Schmidt P, Dettmeyer R, et al. 2003. Simultaneous gas chromatographic-mass spectrometric determination of dopamine, norsalsolinol and salsolinol enantiomers in brain samples of a large human collective. Cell Mol Biol 49 837. 

Yang, C., and Henion, J. (2002). Atmospheric pressure photoionization liquid chromatographic-mass spectrometric determination of idoxifene and its metabolites in human plasma. ]. Chromatogr. A 970, 155-165. 

Takino, M., Daishima, S., and Nakahara, T. (2003). Liquid chromatography/mass spectrometric determination of patulin in apple juice using atmospheric pressure photoionization. Rapid Commun. Mass Spectrom. 17, 1965—1972. 

Garcia, R, and Henion, J. (1992). Fast capillary electrophoresis-ion spray mass spectrometric determination of sulfonylureas. J. Chromatogr. 606, 237—247. 

Technetium isotopes formed upon irradiation of a molybdenum target by protons with an energy of 22 MeV have been ascertained by mass spectrometry. After separation of technetium by ion exchange, the isotopes Tc (0.5 %), Tc (56.0%), Tc (17.3%) and Tc (26.7%) are detected. The sensitivity of this method is very high 5 x 10 g of technetium can be detected. Mass spectrometric determination of technetium is also described by Kukavadze et al. . Pertech-netate is reduced to technetium metal and Tc ions are produced at 1600 to 1800 °C. 

It is evident that in cases where the amination has taken place 100% according to the ANRORC process, no enrichment in the M + 2 peak could be measured and that only enrichment of the M+1 peak in the chloro compound could be observed. Based on these mass spectrometric determinations it was established that the 2-halogenopyrimidines react for the greater part according the Sn(ANRORC) mechanism see Table II.3. 

In order to better understand the detailed dynamics of this system, an investigation of the unimolecular dissociation of the proton-bound methoxide dimer was undertaken. The data are readily obtained from high-pressure mass spectrometric determinations of the temperature dependence of the association equilibrium constant, coupled with measurements of the temperature dependence of the bimolecular rate constant for formation of the association adduct. These latter measurements have been shown previously to be an excellent method for elucidating the details of potential energy surfaces that have intermediate barriers near the energy of separated reactants. The interpretation of the bimolecular rate data in terms of reaction scheme (3) is most revealing. Application of the steady-state approximation to the chemically activated intermediate, [(CH30)2lT"], shows that. 

Teltes J, Levsen K, Volmer D, et al. 1990. Gas chromatographic and mass spectrometric determination of nitroaromatics in water. J Chromatogr 518 21-40. 

Sweely, C. C., Elliott, W. H., Fries, I., and Ryhage, R., Mass spectrometric determination of unresolved components in gas chromatographic effluents. Anal. Chem. 38, 1549-1553 (1966). 

Yu, C., Shin, Y.G., Kosmeder, J.W., Pezzuto, J.M., and van Breemen, R.B., Liquid chromatog-raphy/tandem mass spectrometric determination of inhibition of human cytochrome P450 isozymes by resveratrol and resveratrol-3-sulfate. Rapid Commun. Mass Spectrom., 17, 307, 2003. 

Davis, W. D., Continuous Mass Spectrometric Determination of Concentration of Particulate Impurities in Air by Use of Surface Ionization, Environ. Sci. Technol., 11, 593-596 (1977b). 

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