Negative chemical ionization mass

McClure, TD and Liebler, DC, 1995. Electron capture negative chemical ionization mass spectrometry and tandem mass-spectrometry analysis of beta-carotene, alpha-tocopherol and their oxidation products. J Mass Spectrom 30, 1480-1488. [Pg.347]

Guevremont, R., R.A. Yost, and W.D. Jamieson. 1987. Identification of PCB congeners by collision-induced dissociation of [M-C1+]- from oxygen-enhanced negative chemical ionization mass spectrometry. Biomed. Environ. Mass Spectrom. 14 435-441. [Pg.1328]

Qin BH, Yu BB, Zhang Y, Lin XC. Residual analysis of organochlorine pesticides in soil by gas chromatograph-electron capture detector (gc-ecd) and gas chromatograph-negative chemical ionization mass spectrometry (GC-NCI-MS). Environ. Forensics 2009 10 331-335. [Pg.334]

Imazethapyr herbicide has been determined at the pg kg-1 level in soil by microwave assisted extraction using electron capture negative chemical ionization mass spectrometry [176], A soil extract is prepared by extraction with 0.1M ammonium acetate at pHIO or 1M ammonium acetate at pH9.5. [Pg.256]

Parker CE, Haney CA, Hass JR. 1982. High-performance liquid chromatography-negative chemical ionization mass spectrometry of organophosphorous pesticides. J Chromatogr 237 233-248. [Pg.193]

Microwave-assisted extraction coupled with gas chromatography-electron capture negative chemical ionization mass spectrometry (i. e., MAE-GC-EC-NCI-MS) was described for the simplified determination of imidazolinone herbicides in soil at the ppb level [715]. [Pg.88]

Kim Y-S, Zhang H, Kim H-Y. 2000. Profiling neurosteroids in cerebrospinal fluids and plasma by gas chromatography/ electron capture negative chemical ionization mass spectrometry. Anal Biochem 277 187. [Pg.14]

A recent review [laj emphasizes the complexity of air pollutant samples and describes some of the techniques which have been recently developed for their analysis. Among these are a number of alternate ionization techniques for mass spectrometry. Positive and negative chemical ionization mass spectrometry (CIMSj are analytical tools which can provide significant assistance in solving these problems. Their application in a number of air pollution studies are discussed in this chapter. [Pg.195]

Stellaard F, Langelaar SA, Kok RM, Jakobs C (1989) Determination of plasma bile acids by capillary gas-liquid chromatography-electron capture negative chemical ionization mass fragmentography. J Lipid Res 30 1647-1652... [Pg.662]

Greaves J, Roboz J, Holland JF, et al. 1984. Determination of the binding of polybrominated biphenyls to serum proteins by negative chemical ionization mass spectrometry. Chemosphere 13(5/6) 651-656. [Pg.426]

Buser HR (1976), Anal. Chem. 58 2913-2919.. .Selective detection of brominated aromatic compounds using gas chromatography/negative chemical ionization mass spectrometry"... [Pg.76]

Miles WF, Gurprasad NP, Malis GP (1985), Anal. Chem. 57 1133-1138. Isomer-specific determination of hexachlorodibenzo-p-dioxins by oxygen negative chemical ionization mass spectrometry, gas chromatography, and high-pressure liquid chromatography"... [Pg.76]

Figure 25.9 Negative chemical ionization mass spectrum of the pyrolysis products of PET at 350°C...

Dougherty RC, Dalton J, Biros FJ (1972) Negative chemical ionization mass spectra of polycyclic chlorinated insecticides. Org Mass Spectrom 6 1171-1181... [Pg.235]

Napoli et al. (23) developed a sensitive assay based on negative chemical ionization mass spectrometry to quantify retinoic acid in human plasma. Endogenous levels of all trans retinoic acid in plasma were 4.9 ng/ml, using a 0.1 ml sample. The limit of detection was less than 1 ng/ml. Direct quantification of 13-cis retinoic acid was impossible due to the inability of the GC to resolve the isomers. Barua and Olson (33) described a method to quantify all trans retinoic acid in serum using reverse phase HPLC. They detected 1.8 ng/ml of the all trans isomer, using a 2 ml serum sample and a non-acidic extraction procedure. [Pg.176]

Mateo-Vivaracho, L., Cacho, J. and Ferreira, V. (2007) Quantitative determination of wine polyfunctional mercaptans at nanogram per litre by gas chromatography-negative chemical ionization mass spectrometric analysis of their pentafluorobenzyl derivatives,... [Pg.221]

C. Negative Chemical Ionization Mass Spectrometry of Phenols. 314... [Pg.260]

Shaw LM, Edling-Owens J, Mattes R (1991) Ultrasensitive measurement of delta-9-tetra-hydrocannabinol with a high energy dynode detector and electron-capture negative chemical-ionization mass spectrometry. Clin Chem 37 2062-2068... [Pg.689]

Lai B-W, Liu B-M, Mahk PK, Wu H-F. Combination of liquid-phase hollow fiber membrane microextraction with gas chromatography-negative chemical ionization mass spectrometry for the determination of dichlorophenol isomers in water and urine. Anal Chim Acta 2006 576(1) 61-66. [Pg.274]

Grosjean, E., P.G. Green, and D. Grosjean Liquid chromatography analysis of carbonyl (2,4-dinitrophenyl)hydrazones with detection by diode array ultraviolet spectroscopy and by atmospheric pressure negative chemical ionization mass spectrometry. Analytical Chemistry, 71 (1999) 1851-1861. [Pg.140]

Derivatization is also useful to detect volatile metabolites. Liu et al. [282] described a specific, rapid, and sensitive in situ derivatization solid-phase microextraction (SPME) method for determination of volatile trichloroethylene (TCE) metabolites, trichloroacetic acid (TCA), dichloroacetic acid (DCA), and trichloroethanol (TCOH), in rat blood. The metabolites were derivatized to their ethyl esters with acidic ethanol, extracted by SPME and then analyzed by gas chromatography/negative chemical ionization mass spectrometry (GC-NCI-MS). After validation, the method was successfully applied to investigate the toxicokinetic behavior of TCE metabolites following an oral dose of TCE. Some of the common derivatization reagents include acetyl chloride and TV-methyl-iV- ft-b u (y Idi methyl si I y I) tro (1 uoroacctam i nc (MTBSTFA) for phenols and aliphatic alcohols and amines, dansyl chloride and diazomethane for phenols, dansyl chloride for amines, acidic ethanol and diazomethane for carboxylic acids, and hydrazine for aldehydes. [Pg.172]

Liu, Y. et al., In situ derivatization/solid-phase microextraction coupled with gas chro-matography/negative chemical ionization mass spectrometry for the determination of trichloroethylene metabolites in rat blood, Rapid Commun. Mass Spectrom., 22(7), 1023, 2008. [Pg.199]

Mateo-Vivaracho, L, Ferreira, V., and Cacho, J. (2006). Automated analysis of 2-methyl-3-furanthiol and 3-mercaptohexyl acetate at ng L-l level by headspace solid-phase microextracion with on-fibre derivatisation and gas chromatography—negative chemical ionization mass spectrometric determination,/ Chromatogr. A, 1121,1-9. [Pg.158]