| Chemical Abstract Number (CAS #) |
1929777
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| Synonyms | Vernolate |
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Carbamothioic acid, dipropyl-, S-propyl ester | Vernam | S-Propyl dipropylthiocarbamate |
| Analytical Method |
EPA Method 634 |
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| Molecular Formula | C10H21NOS |
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| 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.
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| Apparent Color | CLEAR LIQUID
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| Odor | FAINT AROMATIC ODOR
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| Boiling Point | 149-150 DEG C AT 30 MM HG
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| Molecular Weight | 203.35
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| Density | 0.954 AT 20 DEG C/20 DEG C
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| Sensitivity Data | No skin irritation but irritating to eyes.
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| 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.
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| 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.
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| 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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