POLYMER ADSORPTION OF INSECTICIDES AND A HERBICIDES AT HIGH-CONCENTRATIONS

Emulsions of the four insecticides and a herbicides fenitrothion, isox athion, cyanophos, and trifluralin were diluted with water, physiologi cal saline, or artificial gastric juice to produce standard solutions of the various concentrations. The capacity of the five polymers polyl eucine, polyphenylalanine, nylon 12, poly (glutamic acid amide), and e thyl cellulose to adsord solutions of the higher concentrations was ev aluated. The capacities of adsorbin and active carbon, both for use in medicines, were compared with the capacities of the polymers. The dep endence of adsorption on the concentration of the agents was studied. The strength of the solvents to decrease the adsorption by polymers wa s, from strong to work artificial gastric juice, physiological saline, and water. The adsorption by the polymers of a nonionic surface-activ e agents was less than their adsorption of the agricultural chemicals. Coexisting surfactants did not interfere with the adsorption of the c hemicals by the polymers, especially polyleucine and polyphenylalanine , but did interfere with the adsorption by active carbon.