SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 1929777
CASRN 1929-77-7
SynonymsVernolate
Carbamothioic acid, dipropyl-, S-propyl ester
Vernam
S-Propyl dipropylthiocarbamate
Analytical Method EPA Method 634
Molecular FormulaC10H21NOS

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

Use SELECTIVE SOIL INCORPORATED HERBICIDE VERNOLATE IS SELECTIVE HERBICIDE WHICH WILL CONTROL ANNUAL GRASS SPECIES SUCH AS CRABGRASS FOXTAILS GOOSEGRASS & BARNYARD GRASS . IT WILL CONTROL NUTSEDGES & SEEDLING JOHNSONGRASS IT IS USEFUL AGAINST CERTAIN BROADLEAF WEED SPECIES SUCH AS ANNUAL MORNING GLORY PURSLANE PIGWEED . CONTROLS WILD CANE. BROADLEAF WEEDS SUCH AS LAMBSQUARTERS, SICKLEPOD CARPETWEED WILL BE CONTROLLED IF APPLICATION IS MADE WHEN CONDITIONS ARE FAVORABLE FOR GERMINATION. Control of germinating broad-leaved and grass weeds in groundnuts, soya beans, maize, tobacco and sweet potatoes. Soil incorporation is necessary, either pre-planting or pre-emergence. Controls yellow nutgrass coffeeweed, Florida pusley velvetleaf.
Apparent Color CLEAR LIQUID
Odor FAINT AROMATIC ODOR
Boiling Point 149-150 DEG C AT 30 MM HG
Molecular Weight 203.35
Density 0.954 AT 20 DEG C/20 DEG C
Sensitivity Data No skin irritation but irritating to eyes.
Environmental Impact Vernolate is released to the environment during its use as a selective herbicide to control grasses and broadleaf weeds on soybeans, peanuts, corn, potatoes, and sweet potatoes. In this use, it is incorporated into the soil or applied below the soil surface to prevent volatilization loss. Vernolate may also be released during its manufacture, transport, storage, formulation and disposal. Vernolate readily volatilizes from moist soil. Losses are reduced if the herbicide is applied to dry soil or immediately incorporated into the soil. Vernolate is moderately mobile in most soils with Koc values in 6 soils ranging from 83 to 391. It biodegrades in soil. Its half-life in warm, moist soil is 1.5-3 wks. If released in water, vernolate will be lost by volatilization. Estimations made from its Henry's Law constant predict a half-life in a model river and a model lake of 1.9 and 18 days, respectively. In the water, vernolate would not be expected to adsorb strongly to sediment. It may biodegrade as it does in soil. Vernolate aerosols resulting from spraying operations will be removed by gravitational settling. Vapor-phase vernolate is estimated to have an atmospheric half-life of 13 hr due to its reaction with photochemically-produced hydroxyl radicals. Exposure to vernolate would be primarily occupational by inhalation and dermal contact.
Environmental Fate Persistence in soil is brief. TERRESTRIAL FATE: Vernolate readily volatilizes from moist soil. Losses are reduced if the herbicide is applied to dry soil or immediately incorporated into the soil. Volatilization rate of ppm levels of vernolate from six soils ranged from 0.17 to 1.20 ug/cm-hr . Vernolate is moderately mobile in most soils with Koc values in 6 soils ranging from 83 to 391 . Its half-life in warm, moist soil is 1.5-3 wks(2-3). However,degradation in soils on which vernolate was previously used may be much faster. AQUATIC FATE: If released in water, vernolate will be lost by volatilization. Estimations made from its Henry's Law constant predict a half-life in a model river and a model lake of 1.9 and 18 days, respectively(1,SRC). In water, vernolate would not be expected to adsorb strongly to sediment or particulate matter in the water column. It biodegrades in soil and may also biodegrade in the aquatic environment. ATMOSPHERIC FATE: Vernolate aerosols resulting from spraying operations will be removed by gravitational settling. Vapor-phase vernolate is estimated to have an atmospheric half-life of 13 hr(1,SRC) due to its reaction with photochemically-produced hydroxyl radicals.
Drinking Water Impact GROUNDWATER: Vernolate was not detected in two wells listed in EPA's Pesticides in Ground Water Data Base .

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