Fumigation of the Immature Stages of Clothes Moths and Carpet Beetles With a Mixture of Ethylene Dichloride and Carbon Tetrachloride

1932 ◽  
Vol 25 (2) ◽  
pp. 243-248
Author(s):  
Glenn W. Herrick ◽  
Grace H. Griswold
Keyword(s):  
Carbon Tetrachloride ◽  
Ethylene Dichloride ◽  
Immature Stages

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%.

Modification of the AOAC Method for Determination of Fumigants in Wheat

1980 ◽  
Vol 63 (3) ◽  
pp. 539-545
Author(s):  
Marion Clower Jr
Keyword(s):  
Carbon Tetrachloride ◽  
Constant Current ◽  
Ethylene Dichloride ◽  
Surveillance Program ◽  
High Recovery ◽  
Ethylene Dibromide ◽  
Aoac Method ◽  
Liquid Chromatographic ◽  
Lower Limits

Abstract The official first action AOAC method for determination of residues of fumigants in grains has been modified for use by 6 laboratories in an FDA pesticide surveillance program. A 15% OV-I7 gas-liquid chromatographic column, installed in a chromatograph equipped with a constant current 63Ni electron capture detector, provides for improved resolution, multiresidue capability, and lower limits of detection. A study was made of the behavior of chloroform, carbon tetrachloride, ethylene dichloride, trichloroethylene, tetrachloroethylene, and ethylene dibromide through the method. Recoveries from fortified wheat samples averaged 105-115%. Experimental evidence is presented which suggests that part of the consistent trend toward high recovery can be attributed to selective sorption of acetone by the CaCI2 used in the final drying step.

Acute Toxicity in Rats of Chlorinated Hydrocarbons Given via the Intratracheal Route

1992 ◽  
Vol 11 (3) ◽  
pp. 173-177 ◽  
Author(s):  
Leslie P. McCarty ◽  
Donal C. Flannagan ◽  
Scot A. Randall ◽  
Keith A. Johnson
Keyword(s):  
Carbon Tetrachloride ◽  
Acute Toxicity ◽  
Medical Treatment ◽  
Lethal Dose ◽  
Chlorinated Hydrocarbons ◽  
First Aid ◽  
Ethylene Dichloride ◽  
Oral Toxicity ◽  
Emergency Medical ◽  
Approximate Lethal Dose

1 The approximate lethal dose (ALD) of six chlorinated hydrocarbons via the intratracheal route has been determined in rats and compared with published oral LD50 values. 2 The compounds tested in this study were dichloromethane, perchloroethylene, trichloroethylene, carbon tetrachloride, chloroform and ethylene dichloride. 3 A method of administering the materials intratracheally to unanaesthetized animals was developed. 4 The intratracheal ALD of the chlorinated hydrocarbons ranged from 3.1 to 17.5% of the oral LD 50 and death was peracute. 5 Aspiration of chlorinated hydrocarbons may present more of a hazard than oral toxicity and should be considered when rendering first aid or emergency medical treatment.

The determination of heats of mixing

1952 ◽  
Vol 212 (1110) ◽  
pp. 406-425 ◽  
Keyword(s):  
Carbon Tetrachloride ◽  
Binary Systems ◽  
Methylene Chloride ◽  
Vapour Phase ◽  
Ethylene Dichloride ◽  
Binary Liquid ◽  
Heats Of Mixing ◽  
Liquid Systems ◽  
Improved Accuracy

A calorimeter has been designed for measuring the heats of mixing of binary liquid systems, which eliminates the need to correct for changes in the composition of the vapour phase on mixing. Improved accuracy has thus been obtained. Heats of mixing have been measured for the three binary systems formed from the three components carbon tetrachloride, chloroform and methylene chloride, and also for the systems benzene + carbon tetrachloride and benzene + ethylene dichloride. Reports that the last system is ideal have been disproved.

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