Fourier spectrometry

The required detection limits for these compounds should be as low as 10 -10"mg/1, which corresponds to ppb or even down to ppt levels. To detect such trace amounts of CW agents it is necessary to combine their preconcentration with chromatography, chromato-mass- and chromato-IR-Fourier-spectrometry. [Pg.43]

As the number of points to be calculated increases beyond about 10,000, the calculation time for a spectmm can become prohibitive, even for very fast present-day computers, for which that computation can take many hours. Prior to the development of fast, readily available computers, this problem was especially annoying and did not appear to be resolvable until about 1966. At that time, Forman [2] published a paper on the application of the fast Fourier transform technique to Fourier spectrometry. This technique had been described in the literature by Cooley and Tukey [3] one year earlier. This algorithm extended the use of Fourier transform spectrometry to encompass high-resolution data in all regions of the infrared spectmm. It is described in the next section. [Pg.78]

If the intensity of the signal varies, due either to fluctuations of the source output, the detector response, or to changes in the refractive index of the atmosphere between the source and the detector scintillation), noise will be seen over the frequency range at which these fluctuations occur. Unlike the types of noise we have considered to date, which are additive, fluctuation noise is multiplicative and is much more serious for Fourier spectrometry. [Pg.169]

Vartanian V H, Anderson J S and Laude D A 1995 Advances in trapped ion cells for Fourier transform ion cyclotron resonance mass spectrometry Mass Spec. Rev. 41 1-19... [Pg.1360]

Amster I J 1996 Fourier transform mass spectrometry J. Mass Spectrom. 31 1325-37... [Pg.1360]

Freiser B S 1988 Fourier transform mass spectrometry Techniques for the Study of Ion-Molecule Reactions ed J M Farrar and W H Saunders (New York Wiley-Interscience)... [Pg.1360]

Son M, Frankevich V, Nappi M, Santini R E, Amy J W and Cooks R G 1996 Broad-band Fourier transform quadrupole ion trap mass spectrometry Anal. Chem. 68 3341 -20... [Pg.1360]

Griffiths P R and de Haseth J A 1986 Fourier Transform Infrared Spectrometry (New York Wiley)... [Pg.1795]

FTICR. Fourier-transform ion cyclotron resonance GC/IRMS. gas chromatography isotope ratio mass spectrometry... [Pg.445]

Griffiths, P. R. and De Haseth, J. A. (1986) Fourier Transform Infrared Spectrometry, John Wiley, Chichester. [Pg.70]

MALDI = matrix assisted laser desorption, ftms = Fourier transform mass spectrometry TOF = time of flight. [Pg.539]

Methods and iastmments that are used to monitor phosgene content ia air are well developed and have been reviewed (46—48). One detection iastmment is a porous tape that measures the concentration of phosgene ia air ia quantities as small as 6 ppb (49). Fourier transform ir spectrometry techniques have been developed to permit line and area monitoring ia the area around phosgene plants (50). [Pg.314]

Mass Spectrometry. Field desorption mass spectrometry has been used to analy2e PPO (179). Average molecular weight parameters (M and could be determined using either protonated (MH + ) or cation attachment (MNa + ) ions. Good agreement was found between fdms and data supphed by the manufacturer, usually less than 5% difference in all cases up to about 3000 amu. Laser desorption Fourier transform mass spectrometry was used to measure PPG ion and it was claimed that ions up to m/2 9700 (PEG) can be analy2ed by this method (180). [Pg.354]

DETERMINATION OF NUTRITIONAL PARAMETERS OF YOGHURT SAMPLES THROUGH PARTIAL-LEAST-SQUARES ATTENUATED TOTAL REFLECTANCE FOURIER TRANSFORM INFRARED SPECTROMETRY... [Pg.142]

The aim of this work is the determination of several nutritional parameters, such as Energetic Value, Protein, Fat, and Carbohydrates content, in commercially available yoghurt samples by using Attenuated Total Reflectance Fourier Transform Infrared (ATR-FT-IR) spectrometry and a partial least square approach. [Pg.142]

Identification of stmctures of toxic chemicals in environmental samples requires to use modern analytical methods, such as gas chromatography (GC) with element selective detectors (NPD, FPD, AED), capillary electrophoresis (CE) for screening purposes, gas chromatography/mass-spectrometry (GC/MS), gas chromatography / Fourier transform infra red spectrometry (GC/FTIR), nucleai magnetic resonance (NMR), etc. [Pg.416]

P. R. Griffiths and J. A. de Haseth. Fourier Transfrsrm Infrared Spectrometry John Wiley Sons, New York, 1986. Chapters 1—8 review FTIR equipment in considerable detail. Chapters 9-19 describe applications, including surface techniques (Chapter 17). [Pg.426]

Finnt, D. F., et al., 1987. Tandem qnadrnpole Fourier tran.sform ma.ss. spectrometry of oligopeptides and small protein.s. Proceedings of the National Academy of Sciences, U.S.A. 84 620—623. [Pg.152]

An on-line chromatography/atmospheric pressure chemical ionization tandem mass spectrometry (LC-APCI/MS/MS) methods was developed for rapid screen of pharmacokinetics of different drugs, including 5 (98RCM1216). The electron impact mass spectrum of 5 and ethyl 9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7Ff-pyrido[l,2,3- fe]-l,4-benzoxazine-6-carboxylate was reported (97MI28). Electron impact/Fourier transform... [Pg.268]

P R Griffiths, Fourier Transform Infrared Spectrometry, 2nd edn, Wiley, New York,... [Pg.816]

Formaldehyde-to-phenol ratios, 404 V-Formyl amines, 158 Fourier transform infrared (FTIR) spectrometry, 116, 300, 387, 407-408 Fradet, Alain, 17 Free-radical copolymerization, 59 Friedel-Crafts acrylation polymerization, 332-334... [Pg.584]

Friedel-Crafts catalysts, 329, 331 Friedel-Crafts reaction, 297, 361 Front-end reactions, 235 FT Raman spectroscopy, 387 FTIR spectrometry. See Fourier transform infrared (FTIR) spectrometry Fuel cells, 272-273 Full prepolymers, 236, 237 Functionalized polyolefins, 459-460... [Pg.584]

Impingement mixing, 200 Implants, bioresorbable, 27 Indentation force deflection (IFD) test, 244 Infrared (IR) spectroscopy, 91, 162, 300, 490. See also Fourier transform infrared (FTIR) spectrometry Ingold s classification, 60-61 Inherent viscosity, 161-162 Injection molding, of polyamides, 136,... [Pg.586]

Spectroscopy, 490. See also 13C NMR spectroscopy FT Raman spectroscopy Fourier transform infrared (FTIR) spectrometry H NMR spectroscopy Infrared (IR) spectroscopy Nuclear magnetic resonance (NMR) spectroscopy Positron annihilation lifetime spectroscopy (PALS) Positron annihilation spectroscopy (PAS) Raman spectroscopy Small-angle x-ray spectroscopy (SAXS) Ultraviolet spectroscopy Wide-angle x-ray spectroscopy (WAXS)... [Pg.601]

The sequence of a globular protein was confirmed by a combination of enzymatic digestion and HPLC with both Fourier-transform infrared spectroscopy (LC-FTIR spectroscopy) and mass spectrometry [11]. [Pg.209]

Table 5.7 Theoretically predicted polypeptides from the trypsin digestion of S-lacto-globulin (/3LG) . Reprinted from J. Chromatogr., A, 763, Turula, V. E., Bishop, R. T., Ricker, R. D. and de Haseth, J. A., Complete structure elucidation of a globular protein by particle beam liquid chromatography-Fourier transform infrared spectrometry and electrospray liquid chromatography-mass spectrometry - Sequence and conformation of /3-lactoglobulin , 91-103, Copyright (1997), with permission from Elsevier Science...

Weiner, S., Goldberg, P. and Bar-Yosef 0. 1993 Bone preservation in Kebara Cave, Israel, using on-site Fourier transform infrared spectrometry. Journal of Archaeological Science 20 613-627. [Pg.115]

Bonding configuration Electron energy-loss spectroscopy Fourier-transform infrared spectrometry (FTIR)... [Pg.152]

Evidence of chemical interaction between the mbbers and compatibUizers was demonstrated by extracting the blends with chloroform at room temperamre and examining both soluble and insoluble fractions with Fourier transform infrared (ETIR) spectrometry. The weight of the insoluble fraction of the compatibilized melt blend was more than that in the uncompatibilized blend indicating the formation of (EP-g-MA)-g-CR due to reaction between MA and allylic chlorine of CR. The compounds containing epoxidized EPDM additive were examined by both optical and... [Pg.309]

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