Decomposition and Volatility of Ddt and Some of Its Derivatives

Residual Action of Organic Insecticides

“…That DDT is less resistant to ultraviolet light when in benzene solution than it is in the solid state has been brought out by Wichmann et al (23). They found that at least 50% of the DDT was changed into other substances within a few hours when irradiated with ultraviolet light from a powerful source.…”

“…Experiments with solid DDT show that both technical and pure , '-DDT are rather stable against strong irradiation with ultraviolet light. The technical product becomes coated with a brown material, but the pure product shows little change (6,23). This greater susceptibility of the technical DDT may be due to the oily by-products which tend to bring the DDT into solution under exposure to high temperatures in the summer.…”

Identification of nanogram amounts of certain organochlorine insecticides

“…At higher concentrations, a lesser degradation of the parent compound was generally observed when irradiation time was held constant. By using size 16 Teflon tubes, which are only 1.3-mm o.d., for trapping and irradiation, it was possible to shorten the irradiation time considerably from those previously reported in the literature (Wichmann et al, 1946;Robinson et al, 1966;Banks and Bills, 1968).…”

Insecticide Mixture Analysis, Chromatographic Separation of Dichlorodiphenyltrichloroethane and Dichlorodiphenyldichloroethane Mixtures

“…Wichmann et al (5) have reported methods of determining dichlorodiphenyltrichloroethane or dichlorodiphenyldichloroethane quantitatively by analysis for total and mobile chlorine. Although the ratio of total to mobile chlorine in the two compounds is different, the procedures are not sufficiently accurate to enable an analysis of mixtures of the two compounds to be made.…”