Carbaryl physical

Van der Waals forces were considered to be involved in the physical adsorption of Carbaryl, Parathion, Alachlor, Picloram, and 2,4-D by SPHs [17,25,152, 160-162]. 

Chemical/Physical Ozonation of carbaryl in water yielded 1-naphthol, naphthoquinone, phthalic anhydride, Wformylcarbamate of 1-naphthol (Martin et al., 1983), naphthoquinones, and acidic compounds (Shevchenko et al, 1982). 

Studies were initiated at Iowa State University in 1977 to determine if pesticides would be contained and degraded when deposited in water/soil systems. Although the addition of known amounts of the selected pesticides was controlled, the physical environment was not temperature, humidity, wind speed, etc. were normal for the climate of Central Iowa. Four herbicides and two insecticides were chosen on the basis of three factors. Firstly, they represented six different families of pesticides. The four herbicides, alachlor, atrazine, trifluralin, and 2,4-D ester, represent the acetanilides, triazines, dinitroanilines, and phenoxy acid herbicides, respectively. The two insecticides, carbaryl and para-thion, represent the carbamate and organophosphorus insecticides, respectively. Secondly, the pesticides were chosen on the basis of current and projected use in Iowa Q) and the Midwest. Thirdly, the chosen pesticides were ones for which analytical methodology was available. 

Chemical/Physical. Ozonation of carbaryl in water yielded 1-naphthol, naphthoquinone, phthalic anhydride, V-formylcarbamate of 1-naphthol (Martin et al., 1983), naphthoquinones and acidic compounds (Shevchenko et al., 1982). Hydrolysis and photolysis of carbaryl forms 1-naphthol (Wauchope and Haque, 1973 Rajagopal et al., 1984, 1986 Miles et al., 1988 Ramanand et al., 1988a MacRae, 1989 Somasundaram et al., 1991) and 2-hydroxy-1,4-naphthoquinone (Wauchope and Haque, 1973), respectively. 

Carbaryl — (i) Chemical Designations — Synonyms I-Naphthyl N-Methylcarbamate Sevin Chemical Formula C,2H N02 (ii) Observable Characteristics — Physical State (as normalfy shaped) Solid Color Off-white Odor Weak (ill) Physical and Chemical Properties — Physical State at 15 X and I atm. Solid Molecular Weight Not pertinent Boiling Point at I atm. Not pertinent Freezing Point 288, 142, 415 Critical Temperature Not pertinent Critical Pressure Not pertinent Specific Gravity 1.23 at 20°C (solid) Vapor (Gas) Demity Not pertinent Ratio of Specific Heats of Vapor (Gas) Not... 

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