Electron capture negative ion

Stemmier, E.A. and Hites, R.A., Electron Capture Negative Ion Mass Spectra of Environmental Contaminants and Related Compounds, VCH, Weinheim, Germany, 1988. 

Wagner, S.L., L.R. Durand, R.D. Inman, U. Kiigemagi, andM.L. Deinzer. 1991. Residues of pentachlorophenol and other chlorinated contaminants in human tissues analysis by electron capture gas chromatography and electronic capture negative ion mass spectrometry. Arch. Environ. Contam. Toxicol. 21 596-606. 

Yu and Bayne [58] differentiated different aroclors in soil using linear discrimination and analyses by electron capture negative ion chemical ionization mass spectrometry. 

The electron capture negative ion chemical ionization mass spectrometric method [58] discussed in section 5.6.1.6 for the determination of polychlorobiphenyls in soils has also been applied to sludges. 

All the compounds studied exhibited M accompanied by intense [M — NO2]- fragment ions in their electron capture negative ion chemical ionization spectra. Additional ions were of low intensity101. 

High-resolution gas chromatography/electron capture negative ion high-resolution mass spectrometry (HRGC-EC-NI-HRMS) has been used for quantifying chloroalkanes in environmental samples [718]. 

Oehme, M. Quantification of fg-pg Amounts by Electron Capture Negative Ion Mass Spectrometry - Parameter Optimization and Practical Advice. Fresenius J. Anal Chem. 1994, 350, 544-554. 

Stemmler EA, Hites RA. 1987. The electron capture negative ion mass spectra of 2,6-dinitroaniline and 2,4-dinitrophenol herbicides and related nitrobenzene derivatives. Biomed Environ Mass Spectrom 14 417-434. 

Electron-capture negative-ion mass spectrometry 1995 ECNIMS 20 [26, p. 60]... 

Kok RM, Howells DW, van den Heuvel CC, Guerand WS, Thompson GN, Jakobs C (1993) Stable isotope dilution analysis of GABA in CSF using solvent extraction and electron-capture negative-ion mass fragmentography. J Inherit Metab Dis 16 508-512... 

Stellaard F, ten Brink HJ, Kok RM, van den Heuvel L, Jakobs C (1990) Stable isotope dilution analysis of very long chain fatty acids in plasma, urine and amniotic fluid by electron capture negative ion mass fragmentography. Clin Chim Acta 192 33-144... 

Fig. 10 Gas chromatography-electron-capture negative-ion high-resolution mass spectrometry multiple-ion chromatogram (sum of penta-octachlorobornanes) of a sediment sample from the Mississauga Basin of Lake Ontario (2-3 cm depth) showing predominance of B6-923 and B7-1001 [84]. Other congener identities are defined in ref [84]. [Reproduced with permission from SETAC]...

Low pressures (10 6 torr) of a reagent gas may be introduced during the delay between ion formation and excitation to provide more selective Cl reactions, such as hydrogen/deuterium exchange reactions (18) or to provide a source of low energy electrons for electron capture negative ion Cl reactions (53, 54). As in the case of "self-CI", the extent of these Cl reactions may be controlled by changing the delay time between ion formation and excitation. 

Iodinated aliphatic compounds Mel, Etl Electron capture (negative ion hydration and photodetachment) [283]... 

Hunt, D. F., and Crow, F. W. (1978). Electron capture negative ion chemical ionisation mass spectrometry. Anal. Ckem. 50, 1781-1784. 

In addition to an increase in the volatility of the analytes, derivatization may also bring about an enhancement in the sensitivity of detection. This is particularly relevant with fluorine-containing reagents (perfluorobenzylation, trifluoroacetylation, heptafluorobutylation), followed by GC/MS analysis under electron-capture negative-ion Cl conditions. 

R.M. Black and R.W. Read, Detection of trace levels of thiodiglycol in blood, plasma and urine using gas chromatography-electron capture negative ion chemical ionisation mass spectrometry, J. Chromatogr., 449, 261-270 (1988). 

The regioselective chloride loss from regiospecifically chlorine-37 enriched dichloro-, trichloro-, tetrachloro- and pentachlorodibenzofurans (149) was investigated under electron capture negative-ion chemical ionization conditions334. 

Chlorine-37 labelled trichlorodibenzofurans have been synthesized as shown in equations 144-146. The 37Cl-labelled PCDBFs have been synthesized to identify the labile chlorines of PCDBFs under electron-capture negative-ion mass-spectrometry conditions and to develop a convenient analytical method to study the above class of compounds in a more controlled way296. 

Ahnoff M, Persson BA (1990) Chromatography of calcium channel blockers. J Chromatogr 531 181-213 Review Carvalho M, Oliveira CH, Mendes GD et al. (2001) Amlodip-ine bioequivalence study quantification by liquid chromatography coupled to tandem mass spectrometry. Bio-pharm Drug Dispos 22 383-390 Fischer C, Heuer B, Heuck K, Eichelbaum M (1986) Quantification of nitrendipine by stable isotope dilution and electron-capture negative ion chemical ionization. Biomed Environ Mass Spectrom 13 645-650... 

---