Introduction
- The chemical (IUPAC) name for diuron is
N-(3, 4-dichlorophenyl)-N, N-dimethylurea (C9H10Cl2N2O). In
California, registered products containing the active ingredient
diuron include Direx, Karmex, and Krovar (in combination with
bromacil), among others.
- Diuron is often used in combination with
other herbicides such as bromacil, hexazinone, paraquat,
thiadiazuron, imazapyr, monosodium, sodium chlorate, sodium
metaborate, and copper sulfate.
Physical-Chemical
Properties
- Molecular weight
: 233.10 g/mole
- Water solubility
: 36.4 ppm (25º C)
- Vapor pressure :
6.90 x10-8 mm Hg (25º C)
- Hydrolysis
half-life : 1490 days (pH 5), 240-1330 days (pH 7), 2020 days
(pH 9)
- Aqueous
photolysis half-life : 43.1–2180 days (pH 7 at 25º C)
- Aerobic soil
degradation : 372 days
- Anaerobic soil
degradation : 995 days
- Soil photolysis
half-life : 173 days
- Field
dissipation half-life : 99.9-134 days
- Henry’s law
constant : 5.10 x 10-10 atm m3 mol-1(25ºC)
- Octanol-water
coefficient Kow : 648 - 747
- Soil adsorption
coefficient Koc : 418-560
First Aid Measures
- Inhalation: Remove from exposure
area to fresh air immediately. If breathing has stopped, perform
mechanical artificial respiration. Keep person warm and at rest.
Treat symptomatically and supportively. Obtain medical attention if
necessary.
- Skin contact: Remove contaminated
clothing, shoes and leather goods. Gently wipe off excess chemical.
Wash skin gently and thoroughly with water and non-abrasive soap.
Seek medical advice if necessary. The product is not considered to
be a skin sensitizer, but persons who become sensitized may require
specialized medical management with anti-inflammatory agents.
- Eye contact: Immediately flush the
eyes with gently flowing lukewarm water or saline solution for 20
minutes, occasionally lifting the upper and lower lids. Obtain
medical attention if necessary.
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