Technical Factsheet on: DINOSEB
List of Contaminants
As part of the Drinking Water and Health pages, this fact sheet is part of a larger publication:
National Primary Drinking Water Regulations
Drinking Water Standards
MCLG: 0.007 mg/L
MCL: 0.007 mg/L
HAL(child): 1 to 10 day: 0.3 mg/L; Longer-term: 0.01 mg/L
Health Effects Summary
Acute: EPA has found dinoseb to potentially cause the following
health effects from acute exposures at levels above the MCL:
sweating, headache, mood changes.
Drinking water levels which are considered "safe" for short-term
exposures: For a 10-kg (22 lb.) child consuming 1 liter of water
per day, a one- to ten- day exposure to 0.3 mg/L or up to a
7-year exposure to 0.01 mg/L.
Chronic: Dinoseb has the potential to cause the following
health effects from long-term exposures at levels above the MCL:
decreased body and thyroid weight, degeneration of testes;
thickening of intestinal lining.
Cancer: There is inadequate evidence to state whether or not
dinoseb has the potential to cause cancer from lifetime exposure
in drinking water.
Usage Patterns
Dinoseb is a contact herbicide used as the ammonium or amine salt
for post-emergence weed control in cereals, undersown cereals,
seedling lucerne and peas.
Oil solutions of dinoseb are used for pre-emergence control of
annual weeds in beans, peas and potatoes, for pre-harvest
dessication of hops, leguminous seed crops, potatoes and for
control of runners and suckers in strawberries and raspberries.
Dinoseb is also used as a corn yield enhancer and an insecticide
and miticide.
1982 production of dinoseb was reported as 6.2 million lbs., with
consumption estimates as follows: as an herbicide for soybeans,
32%; vegetable, 23%; deciduous fruits and nuts, 11%; peanuts, 8%;
citrus, 3%; grain crops, 2%; other field crops, 6%;
industrial/commercial uses, 15%.
Release Patterns
Release of dinoseb has resulted primarily from its use as an
herbicide on a variety of weeds.
Since dinoseb is not a listed chemical in the Toxics Release
Inventory, data on releases during its manufacture and handling
are not available.
Environmental Fate
Dinoseb is expected to biodegrade in slowly and bind weakly to
soil. Therefore, leaching in soil is possible and dinoseb has
been detected in groundwater. However, it may bind more strongly
to clay soils, especially at acidic pH. Photolytic degrdration of
dinoseb from soil surface may be important. Volatilization is not
expected to be significant. The laboratory-measured evaporation
half-life for dinoseb from a soil surface was 26 days. In the
absence of volatilization, the half-life of dinoseb in the vadose
zone sandy loam soil was estimated to be about 100 days.
Dinoseb may photodegrade in surface water with a half-life of
14-18 days. The estimated Henry's Law constant of 5.04X10-4 atm
cu m/mol suggests that volatilization of dinoseb from water will
be slow. It is unlikely to undergo significant biodegradation in
most natural waters. Volatilization from water is expected to be
slow.
The half-life for the reaction of vapor phase dinoseb with
photochemically generated hydroxyl radicals in the atmosphere was
estimated to be 14.1 days. Wet deposition may remove some of the
compound from air.
Bioconcentration is expected to be insignificant. A
bioconcentration factor (BCF) of 68 for dinoseb was estimated
from its water solubility (50 mg/L).
Exposure to dinoseb in humans is expected to occur primarily in
workers using the herbicide.
Chemical/ Physical Properties
CAS Number: 88-85-7
Color/ Form/Odor: Yellow/orange crystals; pungent odor
M.P.: 38-42 C B.P.: N/A
Vapor Pressure: 1 mm Hg at 151.1 C
Octanol/Water Partition (Kow): N/A
Density/Spec. Grav.: 1.26 at 45 C
Solubility: 0.052 g/L of water at 25 C; tends to form salts
which are highly soluble in water
Soil sorption coefficient: Koc =124 (measured); high mobility in
soil
Odor/Taste Thresholds: N/A
Bioconcentration Factor: BCF = 68 (est.); not expected to
bioconcentrate in aquatic organisms.
Henry's Law Coefficient: 5.04x10-4 atm-cu m/mole (est.)
Trade Names/Synonyms: 2,4-dinitro-6-(1-methyl-propyl) phenol;
Dinitrobutylphenol; Aatox; Chemox; Gebutox; Knox-weed; Basanite;
BNP 20; Butaphene; Dibutox; Dinitrall; Dinitro; Desicoil; Dow
Selective Weed Killer; Hivertox; Ladob; Laseb; Nitropone C;
Dytop; Premerge; Hel-fire; Caldon; Kiloseb; Sinox General;
Subitex.
Other Regulatory Information
Monitoring For Ground/Surface Water Sources:
- Initial Frequency- 4 quarterly samples every 3 years
- Repeat Frequency- If no detections during initial round:
- 2 quarterly per year if serving >3300 persons;
- 1 sample per 3 years for smaller systems
- Triggers - Return to Initial Freq. if detect at > 0.0002 mg/L
Analysis:
| Reference Source |
Method Numbers |
| EPA 600/4-88-039 |
515.1; 515.2; 555 |
Treatment- Best Available Technologies:
Granular Activated Charcoal
For Additional Information:
EPA can provide further regulatory and other general information:
EPA Safe Drinking Water Hotline - 800/426-4791
Other sources of toxicological and environmental fate data include:
Toxic Substance Control Act Information Line - 202/554-1404
Toxics Release Inventory, National Library of Medicine - 301/496-6531
Agency for Toxic Substances and Disease Registry - 404/639-6000
National Pesticide Hotline - 800/858-7378
List of Contaminants
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