Asulam

Synonyms methyl[(4-aminophenyl)sulfonyl] carbamate Asilan Asulox 

Crystalline solid melts at 143°C (289.4°F) low solubility in water [5 g/L at 20° C (68°F)] highly soluble in dimethylformamide, acetone and methanol less soluble in chloroform, methylene chloride, and hydrocarbon solvents. 

Low order of toxicity no adverse effect on skin reported ingestion of large dose could produce cholinergic effects. 

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High performance Hquid chromatography with electrochemical detection has been used to determine 2—7 ppb of carbamate pesticides in water (40). The investigated pesticides were aminocarb, asulam, j -butylphenyknethylcarbamate (BPMC), carbaryl, carbenda2im, chlorpropham, desmedipham, and phenmedipham. 

Ionic or amphotheric character of the analytes, e.g. asulam and its metabolites acetylasulam, sulfanilamide, acetylsulfanilamide ... 

The carbamate -NH- moiety present in asulam has acidic properties (e.g. the pA a value for asulam is 4.82). On the other hand, the -NH2 moiety present in sulfanilamide has a slightly alkaline character. Considering these properties, the partition of these analytes into an organic solvent should depend strongly on the pH value in the aqueous phase. 

Acidic or anionic pesticides (e.g., chlorophenoxyalkanoic acids and esters, Asulam, and Dicamba) were reported to be adsorbed by hydrogen bonding onto SPm at pH values below their pKa in nonionized forms through their -COOH and -COOR groups [151-153,157]. 

Butyne, see 1,1,1-Trichloroethane Butyric acid, see Butane Camphenilone, see Camphene Carbamic acid, see Asulam. Carbofuran... 

Nitrosobenzene sulfonic acids, see Asulam yV-Nitrosodimethylamine, see Dimethylamine, 1.1-... 

Succinic acid, see 2-Chlorophenol. Cyclopentene, Maleic hvdrazide. 4-Nitrophenol, Phenol, 2,4.5-T Succinic semialdehyde, see Pyridine Succinyl-CoA, see Cyclohexane Sulfanilamide, see Asulam Sulfanilic acid, see Asulam Sulfonamide, see Prosulfuron Sulfonic acid, see Prosulfuron Sulfur, see Aldicarb. Benzene, Captan. Ferbam. 

CASRN 3337-71-1 molecular formula C8H10N2O4S FW 230.24 Soil Asulum is not persistent in soils because its half-life is approximately 6-14 d (Hartley and Kidd, 1987). The short persistence time is affected by soil temperature and moisture content. The half-life of asulam in a heavy clay soil having a moisture content of 34% and maintained at 20 °C was 7 d (Smith and Walker, 1977). In soil, sulfanilamide was reported as a product of hydrolysis. In nonsterile soils, this compound degraded to unidentifiable products (Smith, 1988) which may include substituted anilines (Bartha, 1971). 

Photolytic. The reported photolytic half-lives for asulam in water at pH 3 and 9 were 2.5 and 9 d, respectively (Humburg et al., 1989). 

Chemical/Physical Forms water-soluble salts (Hartley and Kidd, 1987). When heated to 75 °C, asulam decomposed to sulfanilic acid, carbamic acid, and sulfanilamide. At 90 °C, 4-nitro- and 4-nitrosobenzene sulfonic acids were released (Rajagopal et al., 1984). 

Fig. 9.19 Solar experiment on the degradation of the herbicide asulam, compared with a mercury lamp experiment.

Bruff, S.A., J.L. Griffin, and E.R Richard Jr. (1996). Johnsongrass (Sorghum halepense) control as influenced by timing of asulam and fertilizer/cultivation applications. Weed Technol., 10 134-139. 

Asulam carbamate, sulfonamide Atrazine heterocyclic nitrogen, triazine Azaconazole heterocyclic nitrogen, triazole Azamethiphos oxazole, phosphoro organic, phosphoro thioate, pyridine Azinphos-ethyl benzotriazine, phosphoro organic, phosphoro dithioate... 

Acetaldehyde alanycarb, fluxofenim, methomyl, nitrapyrin, sulfentrazone Acetamide malonic acid glufosinate Acetanilide asulam... 

Methyl asulam, benomyl, carbendazim, flumiclorac, fosamine ammonium, hexazinone, phenmedipham, pyrazosulfuron, thiophanate, triflusulfuron... 

Chloro sulfonic acid asulam, bentazon, carbophenotion, chlorfenson, famphur, fiusulfamide, hexachlorobenzene, imazosulfuron, prosulfuron, tetradifon... 

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