59. Prediction of Gas and Vapor Cartridge Service Lives of Air-purifying Respirators for Carbon Tetrachloride, Acetone, Methylene Chloride and Vinyl Chloride

1999 ◽  
Author(s):  
D.Y. Park ◽  
L.A. Brey ◽  
A.R. Johnston
Keyword(s):  
Carbon Tetrachloride ◽  
Vinyl Chloride ◽  
Methylene Chloride

Diffusion of Methane and Chloromethanes in Air

1971 ◽  
Vol 49 (1) ◽  
pp. 74-77 ◽  
Author(s):  
M. Cowie ◽  
Harry Watts
Keyword(s):  
Carbon Tetrachloride ◽  
Diffusion Coefficients ◽  
Methylene Chloride ◽  
Methyl Chloride ◽  
Diffusion Cell ◽  
Infrared Spectrophotometry ◽  
Gaseous Diffusion ◽  
Simple Diffusion ◽  
Concentration Changes

The binary gaseous diffusion coefficients of air with methane, methyl chloride, methylene chloride, chloroform, and carbon tetrachloride at 298.2 °K and 1 atm have been determined. A simple diffusion cell was used, in which concentration changes of the diffusing gas were followed by infrared spectrophotometry.

Analysis of a Single Crop Extract for Substituted Urea Herbicides and Metabolites, Chlorinated Insecticides, and Amitrole

1969 ◽  
Vol 52 (3) ◽  
pp. 526-532
Author(s):  
John H Onley ◽  
George Yip
Keyword(s):  
Carbon Tetrachloride ◽  
Methylene Chloride ◽  
Established Method ◽  
Florisil Column ◽  
Aqueous Acetonitrile ◽  
Sample Extract ◽  
Ether Extraction ◽  
Layer Chromatography ◽  
Colorimetric Procedure ◽  
Substituted Urea

Abstract An established method for chlorinated insecticides has been modified and extended to include substituted urea herbicides, some urea metabolites, and amitrole. Starting with an acetonitrile sample extract, chlorinated insecticides are removed by petroleum ether extraction for the usual cleanup and determination. The aqueous acetonitrile phase is next extracted with methylene chloride and carbon tetrachloride to isolate the urea compounds (chloroxuron, diuron, fenuron, fluometuron, linuron, metobromuron, monuron and neburon) and some of their metabolites. This combined extract is chromatographed on a MgO-cellulose-Florisil column from which two eluatcs are obtained: one contains the substituted urea herbicides, aniline metabolites, and one compound with the urea moiety and the second contains four compounds with the urea moiety. Both eluates are analyzed by thin layer chromatography. Finally, the aqueous acetonitrile extract is passed through a column of Amberlite IR-120 resin. Amitrole (3-AT), which is absorbed on the resin, is removed with NH4OH and determined by a colorimetric procedure. Recoveries of all compounds from samples fortified at 0.05–5 ppm ranged between 70 and 106%. Apparent limit of sensitivity was 0.05 ppm for both the substituted urea herbicides and their metabolites and for amitrole. Recoveries for the chlorinated insecticides at 0.005 ppm ranged between 76 and 104%.

PHOTOLYSE DE L'IODURE DE VINYLE EN SOLUTION DANS LE TETRACHLORURE DE CARBONE

1964 ◽  
Vol 42 (10) ◽  
pp. 2262-2274 ◽  
Author(s):  
Pierre C. Roberge ◽  
Jan A. Herman
Keyword(s):  
Carbon Tetrachloride ◽  
Vinyl Chloride ◽  
Hydrogen Iodide ◽  
Diffusion Controlled ◽  
Vinyl Iodide

The photolysis of vinyl iodide in carbon tetrachloride solutions gives several products among which the most important are: acetylene, hydrogen iodide, iodine, ethylene, and vinyl chloride. A mechanism based on diffusion-controlled disproportionation of geminate radicals, as first proposed by Hamill, agrees well with the observed phenomena. To explain the diminishing production of ethylene and iodine with increasing concentration of the monomer, it is necessary to postulate a telomerization of the vinyl iodide.

Kinetic modeling of carbon tetrachloride, chloroform and methylene chloride removal from aqueous solution using the electron beam process

1997 ◽  
Vol 31 (2) ◽  
pp. 219-228 ◽  
Author(s):  
Fei T. Mak ◽  
Sarita R. Zele ◽  
William J. Cooper ◽  
Charles N. Kurucz ◽  
Thomas D. Waite ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Electron Beam ◽  
Carbon Tetrachloride ◽  
Kinetic Modeling ◽  
Methylene Chloride ◽  
Chloride Removal
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