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Common NameDicamba
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中文通用名麦草畏
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IUPAC3,6-dichloro-o-anisic acid
or
3,6-dichloro-2-methoxybenzoic acid -
CAS3,6-dichloro-2-methoxybenzoic acid
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CAS No.1918-00-9
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Molecular FormulaC8H6Cl2O3
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Molecular Structure
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Category
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ActivityHerbicide
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PremixTribenuron-methyl+dicamba
Triasulfuron+dicamba
penoxsulam+sulfentrazone+2,4-D+dicamba
Nicosulfuron+Dicamba+Fluroxypyr
Nicosulfuron+dicamba+diflufenzopyr
Metsulfuron-methyl+2,4-D+dicamba
MCPA-sodium+Dicamba
fenoxaprop+fluroxypyr+dicamba
Dicamba+Nicosulfuron
Dicamba+Glyphosate+Triclopyr
Dicamba+Glyphosate ammonium
Dicamba+Glyphosate
Dicamba+2,4-D
Bensulfuron-methyl+dicamba
Water soluble liquid (potassium, dimethylamine salt, diglycolamine salt, sodium salt, isopropylamine salt); wettable granular (sodium salt). Premix Parters: chloropicrin.
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Physical PropertiesMolecular weight:221.0. Physical form:Colourless crystals; ( tech. is a buff crystalline solid). Density:1.488 (25 °C); Composition:Tech. grade purity is 85% w/w, remainder being mainly 3,5-dichloro-o-anisic acid. Melting point:114-116 °C; Vapour pressure:1.67 mPa (25 °C, calc.); Henry constant:6.1×10-5 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = -0.55 ( pH 5.0), -1.88 ( pH 6.8), -1.9 ( pH 8.9) ( OECD 105); pKa:1.97; Solubility:In water 6.1 g/l (25 °C). In ethanol 922, cyclohexanone 916, acetone 810, dichloromethane 260, dioxane 1180, toluene 130, xylene 78 (all in g/l, 25 °C).; Stability:Resistant to oxidation and hydrolysis under normal conditions. Stable in acids and alkalis. Decomposes at c. 200 °C. Soluble in ethanol, acetone, methyl ethyl ketone, and other ketones. Less readily in xylene.
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ToxicologyOral:Acute oral
LD50 for rats 1707 mg/kg. Percutaneous:Acute percutaneous LD50 for rabbits >2000 mg/kg. Extremely irritating and corrosive to eyes; moderately irritating to skin (rabbits). Inhalation: LC50 (4 h) for rats >9.6 mg/l. Phytotoxicity:Most legumes are sensitive. ADI:( JMPR) 0.002 mg/kg b.w. [1993]. Banvel* (Rat): Oral LD50 2629 mg/kg. (Rabbit): De -
Environmental ProfileEcotoxicology:
Algae:LC50 41 to >250 mg/l, depending on species.Bees:Not toxic to bees; LD50 >100 µg/bee.Birds:Acute oral LD50 for mallard ducks 2000 mg/kg. Dietary LC50 (8 d) for mallard ducks and bobwhite quail >10 000 mg/ kg diet.Daphnia: LC50 (48 h) 110 mg/l.Fish: LC50 (96 h) for rainbow trout and bluegill sunfish 135 mg/l.
Environmental fate:
Animals:In mammals, following oral administration, dicamba is rapidly eliminated in the urine, partly as a glycine conjugate.Soil:In soil, microbial degradation occurs, the principal metabolite being 3,6-dichlorosalicylic acid. Under conditions amenable to rapid metabolism,DT50 <14 d. Koc 2. Plant:The degradation rate in plants varies greatly with species. In wheat, the major metabolite is 5-hydroxy-2-methoxy-3,6-dichlorobenzoic acid, whilst 3,6-dichlorosalicylic acid is also a metabolite.
WATER SOLUBILITY: Soluble -
Transport InformationSignal Word:CAUTION; Hazard Class:III (Slightly hazardous)
Porduct NewsMore
New president of Aprosoja Brazil says it is “better not to use dicamba”
Survey shows dicamba may reduce the effectiveness of junglerice controls
Internal docs show Monsanto, BASF prepared for drift complaints prior to dicamba launch
Office of Indiana State Chemist announces 2020 dicamba restriction
USA: Arkansas plant board approves new rules for dicamba use in 2020
Dicamba market predicted to be worth US$ 457.3 mn by 2021
Environmental groups file second lawsuit against US EPA's dicamba use approval
Brazil Ministry of Agriculture discusses use of dicamba herbicide
USA - Cotton farmers should beware of increased herbicide resistance
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