Geminate ion recombination kinetics with competing ion fragmentation: determination of lifetime and high mobility of carbon tetrachloride cation

1986 ◽  
Vol 90 (23) ◽  
pp. 6293-6297 ◽  
Author(s):  
Rolf E. Buehler
Keyword(s):  
Carbon Tetrachloride ◽  
High Mobility ◽  
Ion Fragmentation ◽  
Ion Recombination ◽  
Recombination Kinetics

Collaborative Study Using a ZDBT Colorimetric Method for the Determination of Copper in Alcoholic Products

1967 ◽  
Vol 50 (2) ◽  
pp. 334-338
Author(s):  
Duane H Strunk ◽  
A A Andreasen
Keyword(s):  
Sulfuric Acid ◽  
Carbon Tetrachloride ◽  
Collaborative Study ◽  
Colorimetric Method ◽  
Good Precision ◽  
Determination Of Copper

Abstract Results are given on a collaborative study in which a zinc dibenzyldithiocarbamate (ZDBT) colorimetric method is used to measure copper in alcoholic products such as high wine, spirits, gin, whisky, brandy, rum, and wine. In this method, the sample is made ca 0.SN with sulfuric acid, and carbon tetrachloride containing 0.2% ZDBT is added. The colored copper-ZDBT complex is extracted in the carbon tetrachloride and measured at 438 mμ against a similar carbon tetrachloride extract of a blank. Data show good precision, and it is recommended that the ZDBT method be adopted as official, first action.

Determination of Small Bone Particles in Meat

1968 ◽  
Vol 51 (6) ◽  
pp. 1175-1177 ◽  
Author(s):  
Robert M Hill ◽  
B D Hites
Keyword(s):  
Carbon Tetrachloride ◽  
Meat Products ◽  
The Other ◽  
Small Particles ◽  
Bone Content ◽  
Bone Particles ◽  
Small Bone ◽  
Good Agreement

Abstract Very small particles of bone can be separated from ground meats and meat products by the following procedure: The bulk of the meat is solubilized by digestion with papain and the bone is separated from the other nondigestible material according to its ability to settle in a carbon tetrachloride: acetone mixture. Turkey samples with widely varying bone content were analyzed, with good agreement between duplicate samples.

Improved Codistillation Method for Determination of Carbon Tetrachloride, Ethylene Dichloride, and Ethylene Dibromide in Grain and Grain-Based Products

1985 ◽  
Vol 68 (4) ◽  
pp. 759-762
Author(s):  
Jonathan W Devries ◽  
Paul A Larson ◽  
Raymond H Bowers ◽  
Joyce A Keating ◽  
James M Broge ◽  
...  
Keyword(s):  
Carbon Tetrachloride ◽  
Internal Standard ◽  
Ethylene Dichloride ◽  
Standard Mixture ◽  
Ethylene Dibromide ◽  
Acetone Water ◽  
Relative Standard ◽  
The Common ◽  
Hexane Solution

Abstract A method is described for the determination of the common fumigants carbon tetrachloride (CC14), ethylene dichloride (EDC), and ethylene dibromide (EDB) in grain and grain-based products. A properly prepared sample is mixed with water and hexane, an internal standard mixture of 1,2-dichloropropane (DCP) and 1,2-dibromopropane (DBP) is added, and the fumigants are codistilled with the hexane into an appropriate receiver. After the hexane solution is dried over sodium sulfate, the quantities of fumigants present are quantitated on a gas chromatograph (GC) equipped with an electron capture detector (ECD). For the matrices investigated, the relative standard deviation of the method was 6.0,9.7, and 23.1% for CC14, EDC, and EDB, respectively. Recoveries of added fumigants were 107, 95, and 101%, respectively. Comparison with an acetone-water soak extraction method gave a correlation of 0.967 between methods for EDB with odds of a difference between methods of 35%.

Rapid Thin Layer Chromatographic Determination of Aflatoxin M1 in Powdered Milk

1985 ◽  
Vol 68 (5) ◽  
pp. 952-954
Author(s):  
Maria Luisa Serralheiro ◽  
Maria Lurdes Quinta
Keyword(s):  
Aqueous Solution ◽  
Carbon Tetrachloride ◽  
Thin Layer ◽  
Limit Of Detection ◽  
Chromatographic Determination ◽  
Methanol Solution ◽  
Aflatoxin M1 ◽  
Powdered Milk ◽  
Layer Chromatography

Abstract A method has been developed for the detection of aflatoxin Mi in milk. The toxin is extracted with chloroform, the extract is evaporated, and the residue is partitioned between carbon tetrachloride and an aqueous saline-methanol solution. The toxin is once again extracted with chloroform from the methanol solution and analyzed by thin layer chromatography. The limit of detection of Mi in powdered milk is 0.5 μg/ kg; recoveries of added Mj are about 83%. The limit of detection can be improved to 0.3 μg/kg if the plate is sprayed with an aqueous solution of H2S04 after development.

The Influence of the Cell Geometry on the Signal Shape in Electron Drift Velocity Measurements

1986 ◽  
Vol 41 (7) ◽  
pp. 912-920 ◽  
Author(s):  
A. F. Borghesani ◽  
L. Bruschi ◽  
M. Santini ◽  
G. Torzo
Keyword(s):  
Edge Effects ◽  
Accurate Determination ◽  
Finite Size ◽  
High Mobility ◽  
Drift Chamber ◽  
Cell Geometry ◽  
Experimental Conditions ◽  
Drift Cell ◽  
Cell Dimensions

An accurate determination of the “time-of-flight” in swarm experiments with a parallel plate drift chamber requires that the time evolution of the charge induced on the collector is linear. This is obtained in very large chambers where the edge effects can be neglected. However, the experimental conditions of high-mobility carriers and highly pressurized gases impose some constraints on the acceptable drift cell dimensions. We have numerically calculated the effects of the finite size of the collector by exploiting the methods of the images. The numerical results have been experimentally checked using a suitable drift cell of variable geometry. As a result, a quantitative limit on the ratio between the collector radius and the drift distance has been established in order to design drift cells for which the edge effects can be neglected. P.A.C.S. numbers: 2940. 4110 D, 3480 B

Rapid Infrared Method for Toxaphene in Animal Dips and Sprays

1964 ◽  
Vol 47 (3) ◽  
pp. 591-594
Author(s):  
Fred P Czech
Keyword(s):  
Sodium Chloride ◽  
Carbon Tetrachloride ◽  
Infrared Spectrum ◽  
Spectrophotometric Method ◽  
Active Ingredient ◽  
Baseline Method ◽  
Characteristic Absorption ◽  
Characteristic Absorption Peak ◽  
Infrared Method

Abstract An infrared spectrophotometric method has been developed for the determination of toxaphene in aqueous emulsions used for the eradication of ectoparasites in livestock. The active ingredient is "salted-out" of emulsion with sodium chloride and extracted with carbon tetrachloride, and an infrared spectrum is taken of the latter extract. Toxaphene concentration is obtained from its characteristic absorption peak at 1303 cm-1 by the baseline method. The infrared method has the advantages of speed, simplicity, and, especially, specificity over chemical procedures.

Rapid Determination of Furazolidone in Feed

1964 ◽  
Vol 47 (3) ◽  
pp. 562-565
Author(s):  
Loyal R Stone
Keyword(s):  
Carbon Tetrachloride ◽  
Rapid Determination ◽  
Official Method ◽  
Alumina Column ◽  
Additional Advantage ◽  
Carbon Tetrachloride Solution ◽  
Color Development ◽  
Laboratory Time

Abstract Furazolidone is extracted from feed into dimethylformamide-carbon tetrachloride solution and isolated by chromatography on an alumina column. After extraction into water the absorbance of furazolidone itself is measured without color development. The procedure requires much less laboratory time than method 33.025 and has the additional advantage of being specific for furazolidone. Accuracy is at least equal to that of the official method over the range 0.0055% to 0.033% furazolidone.

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