FLUROXYPYR-MEPTYL

Common name:Fluroxypyr-meptyl

Chemical Name:

4-amino-3,5-dichloro-6-fluoro-2-pyridyloxyacetic acid

[(4-amino-3,5-dichloro-6-fluoro-2-pyridinyl)oxy]acetic acid

Other names:Starane (Dow); Tomahawk, Tomigan(Makhteshim-Agan) Chemical Structure:

Physical and Chemical Properties:

Molecular weight: 255.0; Physical form: White, crystalline solid. Density:1.09 (24 °C); Melting point:232-233 °C; Vapour pressure:3.784 ×10-6 mPa (20 °C, Knudsen effusion); Henry constant:1.06 × 10-8 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water): logP = -1.24 (unstated pH); pKa:2.94; Solubility: In water 91 mg/l (unspecified pH, 20 °C). In acetone 51.0, methanol 34.6, ethyl acetate 10.6, isopropanol 9.2, dichloromethane 0.1, toluene 0.8, xylene 0.3 (all in g/l, 20 °C).; Stability: Stable in acidic media. Fluroxypyr is acidic, and reacts with alkalis to form salts. DT50 in water 185 d ( pH 9, 20 °C). Stable at temperatures up to melting point. Stable in visible light.

Purity: 95%, 97%

Uses: Cereals, fallow land, and farm noncropland.

Mode of actions:Postemergence control of broadleaf weeds in cereals, fallow land, and farm noncropland.

Toxicology:

Oral: Acute oral LD₅₀ for rats 2405 mg/ kg. Percutaneous: Acute percutaneous LD₅₀ for rabbits >5000 mg/kg. Mild eye irritant; non-irritating to skin (rabbits). Inhalation: LC₅₀ (4 h) for rats >0.296 mg/l air. Phytotoxicity: Non-phytotoxic to the crops for which its use is recommended.

Environmental Profile:

Ecotoxicology:

Algae: EC₅₀ (96 h) for green algae >100 mg/l. Bees: Not toxic to bees. LD₅₀ (contact, 48 h) >25 μg/bee. Birds: Acute oral LD₅₀ for mallard ducks and bobwhite quail >2000 mg/ kg. Daphnia: LC₅₀ (48 h) >100 mg/l. Fish: LC₅₀ (96 h) for rainbow trout and golden orfe >100 mg/l.

Environmental fate:

Animals: In rats, following oral administration, fluroxypyr is not metabolised, but is rapidly excreted unchanged, principally in the urine. Soil: In soil, fluroxypyr is rapidly degraded by micro-organisms in aerobic conditions to 4-amino-3,5-dichloro-6-fluoropyridin-2-ol,4-amino-3,5-dichloro-6-fluoro-2-methoxypyridine, and CO₂. DT₅₀ in laboratory soil studies Plant: In plants, fluroxypyr is not metabolised, but biotransformation to conjugates occurs.

Transport Information:

Signal Word: WARNING; Hazard Class: II(Moderately hazardous)

Other products:

Straight Formulated Products: Fluroxypyr-meptyl 200g/L EC

Mixtures:

Tribenuron-methyl+fluroxypyr

Thifensulfuron-methyl+tribenuron-methyl+fluroxypyr Fluroxypyr+florasulam

MCPA+fluroxypyr Fluroxypyr+clodinafop-propargyl Fluroxypyr+carfentrazone-ethyl

Fluroxypyr-meptyl+thifensulfuron-methyl+ethametsulfuron+tribenuron-methyl Fluroxypyr+2,4-D ester

Florasulam+Fluroxypyr-meptyl fenoxaprop+fluroxypyr+dicamba florasulam+fluroxypyr+MCPA

Tribenuron Methyl+Carfentrazone-ethyl+Fluroxypyr-meptyl Florasulam+MCPA-isooctyl+fluroxypyr-meptyl Fluroxypyr+Nicosulfuron+Atrazine pinoxaden+clodinafop+2,4-D ester+fluroxypyr Penoxsulam+Fluroxypyr-meptyl thiencarbazone+tribenuron+thifensulfuron+fluroxypyr+MCPA clopyralid+fluroxypyr+pyroxsulam

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