SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 1918167
CASRN 1918-16-7
SynonymsPropachlor
Acetamide, 2-chloro-N-(1-methylethyl)-N-phenyl-
2-Chloro-N-isopropylacetanilide
Ramrod
Analytical Methods EPA Method 508
EPA Method 8081
Molecular FormulaC11H14ClNO

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use HERBICIDE FOR GRASSES & BROADLEAF WEEDS ON CORN, SORGHUM, SOYBEANS, SUGAR BEETS AND OTHER FIELD CROPS, FORAGE CROPS, PASTURE LAND, & RANGE LAND, SUMMER FALLOW, & ON VEGETABLES Herbicide effective against annual grasses and some broad-leaved weeds in beans, brassicas, cotton, groundnuts, leeks, maize, onions, peas, roses, ornamental trees and shrubs, and sugarcane . Selective herbicide for control of annual grasses and some annual broad-leaved weeds in garlic, fennel, flower crops, flax, oilseed rape, strawberries, pumpkins .
Consumption Patterns AS A HERBICIDE FOR ANNUAL GRASSES & BROADLEAF WEEDS: 90% USED ON CORN; 6% ON SORGHUM; 2% ON SOYBEANS; 1% ON VEGETABLES; & 1% IN OTHER APPLICATIONS (ON SUGAR BEETS & OTHER FIELD CROPS, FORAGE CROPS, PASTURE & RANGE LAND, & SUMMER FALLOW) (1971)
Apparent Color LIGHT TAN SOLID ; WHITE, CRYSTALLINE SOLID
Boiling Point 110 DEG C @ 0.03 MM HG
Melting Point 67-76 DEG C
Molecular Weight 211.71
Density 1.242 G/ML @ 25 DEG C
Environmental Fate Propachlor was applied to soil and to onions as pre- and post-emergence treatments. Residues of free N-isopropylaniline or propachlor were not present in the onions when harvested nor in soil when sampled one year afer treatment. Analyses of the onions and soil, however, did show the presence of a conjugated metabolite which was shown after hydrolysis to be N-isopropylaniline. Residues of this conjugate were present as much as 2 years after application. Ring-(14)C-labeled alachlor and propachlor were studied in a model eco-system. Alachlor was degraded into eight compounds and propachlor into seven compounds. None were identified. In each case some of the material was unextractable. There was no evidence of magnification of the two compounds or their metabolites in the food chain. TERRESTRIAL FATE: Biodegradation may control the fate of propachlor in soil(1-2). The biodegradation may proceed either by cometabolism leading to the formation of several metabolites or to complete mineralization of propachlor . Both increase in soil temperature and moisture content will accelerate biodegradation of propachlor in soil . Photodegradation of soil-bound propachlor by sunlight is not expected to be important . The loss of propachlor from dry soil by volatilization will not be important, the volatilization may become important in some moisture-saturated soil under windy conditions . TERRESTRIAL FATE: Both soil thin layer chromatographic studies and Koc values in the range 45-794(1-3) suggests that propachlor will be highly to moderately mobile in most soils. The half-life of propachlor in most soils under field conditions is 4 to 14 days , but the metabolites of propachlor may persist in soil much longer(5,SRC). AQUATIC FATE: Photolysis of the compound in water by sunlight may not be important, but the presence of sensitizers may accelerate the rate of photolysis . The estimated Koc value in the range 45-794(2-4) suggests that adsorption to suspended solids and sediment may be of low to moderate importance for the removal of propachlor from water. Based on a value of 1.09X10-7 atm-cu m/mole for Henry's Law constant , the volatilization of propachlor from water will not be important(6,SRC). AQUATIC FATE: THe major process for the loss of propachlor from water is biodegradation(6-7). Both the experimental and the estimated bioconcentration factor in the range 1-17(1-3) indicates that bioconcentration of propachlor in aquatic organisms not be important. Only 15.5% of propachlor was lost from a lake water in 30 days . In another lake water, 59% of propachlor metabolized in 6 weeks . ATMOSPHERIC FATE: Based on a vapor pressure of 2.3X10-4 mm Hg at 25 deg C , propachlor may exist predominantly in the vapor phase in the atmosphere(2,SRC). Based on an estimation method , vapor phase propachlor may be removed from the atmosphere with a half-life of 5.7 hrs due to reaction with photochemically produced hydroxyl radicals. Partial removal of particulate propachlor from the air may occur by dry deposition. The fact that propachlor has been detected in rainwater suggests it will be removed from the atmosphere by wet deposition as well.
Drinking Water Impact LABILE IN AQ ENVIRONMENT, & THERE IS NO EVIDENCE TO INDICATE THAT METABOLITES OR DEGRADATION PRODUCTS WERE ACCUM IN BIOTA. SURFACE WATER: Propachlor was detected in 1 of 7 samples from lower Tuttle Creek Lake, KS at a concn 0.25 ug/l . It was also detected in Mississippi River water near Memphis, TN at a concn 13 ng/l . On a nationwide basis, propachlor was found in 34 of 1690 surface water samples at a max concn of 10 ug/l . GROUNDWATER: Propachlor was detected in an average of 1.2% of groundwater samples collected from IL, IA and MN . The max propachlor concn in groundwaters from IL, IA and MN were 2.98 ug/l, 1.75 ug/l and 0.52 ug/l, respectively . Propachlor was also detected in 12% groundwater samples from NE at a median concn of 1.65 ug/l . In a nationwide survey, propachlor was detected in 2 of 99 groundwater samples collected from 94 wells at a max concn of 0.12 ug/l . RAIN WATER: Propachlor was detected in 3.1% of rain water samples from IA at a max. and median concn of 0.88 and 0.17 ug/l, respectively . EFFL: Propachlor was detected in 1.4% of tile drainage water from agricultural lands in IA at a max concn of 1.7 ug/l .

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