Quantitative Determination of the Concentration of Vaporized Carbon Tetrachloride

1936 ◽  
Vol 8 (4) ◽  
pp. 260-263 ◽  
Author(s):  
John C. Olsen ◽  
Henry F. Smyth ◽  
George E. Ferguson ◽  
Leopold Scheflan
Keyword(s):  
Carbon Tetrachloride ◽  
Quantitative Determination

Quantitative Determination of Copper in Natural Rubber

1953 ◽  
Vol 26 (1) ◽  
pp. 251-256 ◽  
Author(s):  
Lewis T. Milliken
Keyword(s):  
Carbon Tetrachloride ◽  
Natural Rubber ◽  
Quantitative Determination ◽  
Oxidation Process ◽  
Aqueous Suspension ◽  
Wet Oxidation ◽  
Acid Extract ◽  
Organic Solution ◽  
Determination Of Copper

Abstract A procedure is recommended in which small amounts of copper in rubber can be measured quantitatively by determining the depth of color of a copper carbamate complex in a carbon tetrachloride solution. The complex is formed in an alkaline solution prepared from an acid extract of the rubber ashed at 550° C. This procedure yields results which are as reliable as those obtained by the more tedious and time-consuming procedures involving the wet-oxidation process which are at present recommended by standardizing organizations. The use of an organic solution rather than an aqueous suspension gives better reproducibility, permits easier use of a photometer, and reduces the interference due to iron by a factor of ten.

Radical and Ionic Reactions of Tetraethylthiuram Disulfide

1960 ◽  
Vol 33 (4) ◽  
pp. 1062-1067
Author(s):  
A. L. Klebanskiĭ ◽  
L. P. Fomina
Keyword(s):  
Carbon Tetrachloride ◽  
Quantitative Determination ◽  
Kinetic Investigation ◽  
Reaction Products ◽  
Ionic Reactions ◽  
Velocity Effect ◽  
Tetraethylthiuram Disulfide

Abstract 1. Investigation of the process of radical dissociation of TETD in carbon tetrachloride indicates that at 145° thiuram radicals are formed which react with the carbon tetrachloride to form (C2H5)2N—C‖S—SCl and CS2. 2. A quantitative determination of the products of the base-influenced dissociation of TETD was carried out. A kinetic investigation of this reaction, in which initiator (K2S2O3) and inhibitor (PBNA) were shown to have no velocity effect whatever, indicates that the process is an ionic one. 3. It is shown that in the reaction of TETD with diethylamine, one of the reaction products appears to be diethylammonium diethyldithiocarbamate.

Toxicologic Studies on Hydrocarbons. VI. A Colorimetric Method for the Determination of Kerosine in Blood

1960 ◽  
Vol 6 (4) ◽  
pp. 327-331 ◽  
Author(s):  
Horace W Gerarde ◽  
Paul Skiba
Keyword(s):  
Sulfuric Acid ◽  
Carbon Tetrachloride ◽  
Quantitative Determination ◽  
Calibration Curve ◽  
Colorimetric Method ◽  
Acid Reagent

Abstract A photoelectric colorimetric method is described for the quantitative determination of kerosine in blood. The procedure involves hemolysis of 5 ml. of the sample followed by extraction of the kerosine with carbon tetrachloride. The extract is reacted with a formaldehyde- sulfuric acid reagent to produce a characteristic color. The intensity of this color is measured photometrically, and the concentration of kerosine is determined by reference to a previously prepared calibration curve. Concentrations as low as 10 ppm can be conveniently determined.

Investigation of the vaginal smear (Allen-Doisy) assay of oestrogen in ovariectomized ewes

1965 ◽  
Vol 16 (2) ◽  
pp. 201 ◽  
Author(s):  
DR Lamond ◽  
DR Lang
Keyword(s):  
Carbon Tetrachloride ◽  
Quantitative Determination ◽  
Liver Damage ◽  
Dose Response ◽  
Dry Matter ◽  
Trifolium Pratense ◽  
Subcutaneous Administration ◽  
Red Clover ◽  
Vaginal Smear

The vaginal smear (Allen-Doisy) assay for oestrogens has been studied with ovariectomized ewes. Variation between ewes was considerable and the slopes of the log dose-response lines were low. The value of the assay for quantitative determination of oestrogen is limited by lack of precision. The oestrogenic content of red clover (Trifolium pratense) was estimated in terms of micrograms of injected stilboestrol per kilogram of dry matter. Considerable variation in sensitivity to the standard was observed. Intraruminal administration of stilboestrol reduced its activity about 100-fold compared with subcutaneous administration. Ewes were given carbon tetrachloride to cause liver damage but the vaginal response to red clover was not altered.

Fluorometric and Thin Layer Chromatographic Determination of Aminacrine and Its Salts in Drug Preparations

1966 ◽  
Vol 49 (4) ◽  
pp. 837-840
Author(s):  
Laura A Roberts
Keyword(s):  
Carbon Tetrachloride ◽  
Thin Layer ◽  
Quantitative Determination ◽  
Thin Layer Chromatography ◽  
Chromatographic Determination ◽  
Basic Solution ◽  
Antimony Pentachloride ◽  
Fluorometric Method ◽  
Layer Chromatography

Abstract A fluorometric method has been developed for the quantitative determination of aminacrine (USAN name for 9-aminoacridine) and its salts in a wide variety of drug preparations. Aminacrine is extracted with chloroform from basic solution, the chloroform is evaporated, and the residue is dissolved in acidic ethanol. Aminacrine is identified by thin layer chromatography; travel of sample and standard spots is compared under ultraviolet light. Aminacrine is confirmed by spraying the plate with a solution of antimony pentachloride in carbon tetrachloride to produce a yellow spot.

Quantitative determination of longitudinal and transverse cross-relaxation rates

1999 ◽  
Vol 96 (9/10) ◽  
pp. 1608-1615
Author(s):  
T. E. Malliavin ◽  
H. Desvaux ◽  
M. A. Delsuc
Keyword(s):  
Quantitative Determination ◽  
Cross Relaxation ◽  
Relaxation Rates
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