Direct determination of ambient carbon dioxide and nitrous oxide with a high-temperature 63Ni electron-capture detector

1978 ◽  
Vol 166 (2) ◽  
pp. 593-598 ◽  
Author(s):  
P.G. Simmonds
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
High Temperature ◽  
Electron Capture ◽  
Direct Determination ◽  
Electron Capture Detector

Gas Chromatographic Determination of N-Butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-toluidine and α,α,α-Trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine in Formulations

1971 ◽  
Vol 54 (3) ◽  
pp. 711-712
Author(s):  
Martha Fuzesi
Keyword(s):  
Gas Chromatography ◽  
Quantitative Determination ◽  
Electron Capture ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Electron Capture Detector ◽  
Reference Solution ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is described for the quantitative determination of N-butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-tolindine and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyI-p-toluidine herbicides in formulations. The sample is extracted with benzene, and equal amounts of sample and reference solution in the same concentration range are analyzed by gas chromatography, using an electron capture detector and an SE-30/Diatoport S column. The method has been applied successfully to laboratory-prepared and commercial samples.

Combined ventilatory and breath-holding evaluation of sensitivity to respiratory gases

1959 ◽  
Vol 14 (3) ◽  
pp. 353-356 ◽  
Author(s):  
Robert C. Stroud
Keyword(s):  
Carbon Dioxide ◽  
Ventilatory Response ◽  
Direct Determination ◽  
Breath Holding ◽  
Respiratory Response ◽  
Data Comparison ◽  
Direct Measurements ◽  
Respiratory Gases ◽  
Definite Role

Direct measurements of the ventilatory response to variations in CO2 tension independent of changes in O2 tension are easily obtained by breathing mixtures of carbon dioxide in 100% oxygen. Direct determination of the respiratory response to O2, however, is not possible due to alternations in CO2 tension resulting from changes in ventilation. Therefore, an attempt has been made to determine this response empirically by a combined analysis of breath-holding and ventilatory data. Comparison of experimentally determined responses to various combinations of O2 and CO2 tensions agree quite well with those predicted by this approach and indicate that oxygen plays a small but definite role in the regulation of eupnic breathing at sea level. Submitted on October 22, 1958

Determination of indicator polychlorinated biphenyls (PCBs) by gas chromatography–electron capture detector

Chemosphere ◽  
2013 ◽  
Vol 93 (8) ◽  
pp. 1556-1560 ◽  
Author(s):  
Samuel Afful ◽  
Johannes A.M. Awudza ◽  
Stevester K. Twumasi ◽  
Shiloh Osae
Keyword(s):  
Gas Chromatography ◽  
Polychlorinated Biphenyls ◽  
Electron Capture ◽  
Electron Capture Detector

Microdetermination of Bioethanomethrin

1975 ◽  
Vol 58 (4) ◽  
pp. 781-784
Author(s):  
Donald A George ◽  
Leslie M Mcdonough
Keyword(s):  
Spectral Data ◽  
Electron Capture ◽  
Synthetic Pyrethroid ◽  
Pyrethroid Insecticide ◽  
Electron Capture Detector ◽  
Gas Chromatograph ◽  
Mass Spectral Data ◽  
Acid Moiety ◽  
Mass Spectral

Abstract A microanalytical method was developed for the determination of the experimental synthetic pyrethroid insecticide Bioethanomethrin ((5- benzyl-3-furyl) methyl trans-(+)-3-( cyclopentylidenemethyl)-2,2 -dimethylcyclopropanecarboxylate). After saponification, trichloroacetyl chloride is used to form an ester from the alcohol moiety, and trichloroethanol is used to form an ester from the acid moiety. Infrared and mass spectral data support the expected structures of the derivatives formed. Nanogram sensitivity is realized by utilizing a gas chromatograph with an electron capture detector.

Capillary Gas Chromatographic Determination of T-2 Toxin, HT-2 Toxin, and Diacetoxyscirpenol in Cereal Grains

1984 ◽  
Vol 67 (6) ◽  
pp. 1105-1107
Author(s):  
Huguette Cohen ◽  
Michel Lapointe
Keyword(s):  
Electron Capture ◽  
Impact Ionization ◽  
Chromatographic Determination ◽  
Fused Silica ◽  
Electron Capture Detector ◽  
Resolving Power ◽  
Cereal Grains ◽  
Gas Chromatography Mass Spectrometry ◽  
Silica Column

Abstract A capillary gas chromatographic (GC) method using an electron capture detector is described for determining T-2 and HT-2 toxins and diacetoxyscirpenol (DAS) in cereal grains at levels as low as 100 ppb for T-2 and DAS and 50 ppb for HT-2. Samples are extracted with methanol-water according to the Scott method, and further purified on a silica gel cartridge and a cyano column. Heptafluorobutyrylimidazole (HFBI) is added to form the esters of the analytes. Ester(s) of T-2, HT-2 and DAS are separated on a 30 m × 0.32 mm DB-5 fused silica column and measured with a "Ni electron capture detector. Samples were confimed by gas chromatography/mass spectrometry using electron impact ionization and single ion monitoring at the molecular mass of 501.11 m/z for T-2, 665.08 m/z for HT-2, and 502.12 m/z for DAS at 10 000 resolving power. The method was applied to wheat, oats, and barley. Average recoveries ranged from a low of 65% for T- 2 in barley to a high of 99% for DAS in oats.

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