10 CIRCULAR 9 7 7. U. S. DEPARTMENT OF AGRICULTURE 



Technical dieldrin contains not less than 85 percent and technical 

 aldrin not less than 95 percent of the pure compound. Recrystallized 

 products contain not less than 99 percent of the pure compounds. 

 Aldrin is also commonly sold as an oily solution designated as "60 per- 

 cent aldrin equivalent solution," which contains 57 percent of the 

 pure compound and 43 percent of chlorinated and hydrocarbon sol- 

 vents normally resulting from the manufacturing process. For form- 

 ulation purposes 1% pounds of this solution is considered to be equiva- 

 lent to 1 pound of aldrin. It has a tan color and a specific gravity of 

 1.33-1.48. It is miscible in all proportions in the common hydro- 

 carbon solvents. 



The approximate solubilities in representative solvents are shown 

 below. 3 



Solvent 



Acetone 



Benzene 



Carbon tetrachloride 



Deobase 



Ethylene dichloride 



Kerosene, deodorized 



Shell E-407R 



Summer diesel (fuel oil) 



S/V Sovacide 544-C _ _'_'__ 



Toluene ' 



Xylene 



Methods of Analysis 



The methods for the determination of total organically bound 

 chlorine as used for DDT may also be used for dieldrin and aldrin 

 when it is known that other organic chlorine compounds are absent. 

 The factors for converting organically bound chlorine to aldrin and 

 dieldrin are 1.715 and 1.789, respectively. The method is not specific. 



Both dieldrin and aldrin may be determined by infrared spectros- 

 copy. The 8.48-micron absorption peak for aldrin and the 10.98- and 

 11.808-micron absorption peaks for dieldrin have been recommended. 

 Aldrin and dieldrin would interfere with each other if present in the 

 same sample. 



A colorimetric method for aldrin is based on its reaction with phenyl 

 azide to yield a triazole derivative that couples with diazotized 2,4- 

 dinitroaniline in the presence of concentrated hydrochloric acid to 

 give a red color, the intensity of which may be read on a spectrophotom- 

 eter at 515 millimicrons. Other common insecticides do not in- 

 terfere. 



Dieldrin may be determined by reacting it (across the epoxy group- 

 ing) with anhydrous hydrogen bromide dissolved in dioxane. Titration 

 with a standard aqueous sodium hydroxide solution indicates the 

 takeup of hydrogen bromide and consequently the quantity of dieldrin. 

 Unsaturated bonds and other epoxy compounds interfere. 



3 Supplied by Julius Hyman and Company. 1950. 



Grams per 



100 



ml. 



of solvent at 25 



C. 



Dieldrin 



Aldrin 



26 





109 



56 





183 



48 





303 



4 





18 



70 





312 



5 





28 



26 







17 





30 



37 







54 





267 



52 





235 



