Inhibition of the Catalyzed Thermal Decomposition of DDT

Abstract
When 1.5% of ferric nitrate, 2% of picolinic acid (GD 2100) or salicylal-amino-guanidine (GD 2101), and 96.5% of iron-free technical DDT of setting pt. 90.1[degree]C were mixed and heated 24 hrs. at 110-120[degree]C, the resulting dehydrohalogenation was negligible (1% for GD 2100; 2.5% for GD 2101). Without inhibitors, the resulting dehydrohalogenatiou was complete under the same conditions. The inhibition of the iron-catalyzed thermal decomposition of DDT was not attributable solely to mere buffer action since there was extensive dehydrohalogenation in the presence both of calcium dihydrogen phosphate and of Na2CO3.

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