herbicide Diflufenican 97%&98%TC, CAS No.:83164-33-4 CAS NO.83164-33-4

diflufenican

chemical name: n-(2,4-difluorophenyl)-2-[3-(trifluoromethyl)phenoxy]-3-pyridinecarboxamide

product category: herbicide

appearance: white powder

mf: c19h11f5n2o2

cas no. : 83164-33-4

molecular weight : 394.3

melting point: 161-162°c

b.p.: v.p.: 4.25 × 10-3 mpa (25 °c, gas saturation method) henry: 0.033 pa m3 mol-1s.g.

solubility: in water <0.05 mg/l (25 °c). soluble in most organic solvents, e.g. acetone, dimethylformamide 100, acetophenone, cyclohexanone 50, isophorone 35, xylene 20, cyclohexane, 2-ethoxyethanol, kerosene <10 (all in g/kg, 20 °c).

stability: stable in air up to melting point. at 22 °c, very stable in aqueous solution at ph 5, 7 and 9. fairly stable to photolysis.

toxicity: (rat):

oral: acute oral ld50 for rats >2000, mice >1000, rabbits >5000 mg/kg.

skin and eye acute percutaneous ld50: for rats >2000 mg/kg. non-irritating to skin and eyes (rabbits).

inhalation: (4 h) for rats >2.34 mg/l air.

birds: acute oral ld50 for quail >2150, mallard ducks >4000 mg/kg.

fish: lc50 (96 h) for rainbow trout 56-100, carp 105 mg/l.

bees: non-toxic by ingestion or contact.

daphnia: lc50 (48 h) - no effect at 10 mg/l.

algae: no growth inhibition of algae (96 h) at 10 mg/l.

worms: non-toxic to earthworms.other aquatic spp

mode of action: selective contact and residual herbicide, absorbed principally by the shoots of germinating seedlings, with limited translocation.

uses: applied at 125-250 g/ha pre- or early post-emergence in autumn-sown wheat and barley to control grass and broad-leaved weeds, particularly galium, veronica and viola spp. normally used in combination with isoproturon or other cereal herbicides. phytotoxicity: any slight phytotoxicity is in the form of small transient patches on basal leaves, with no adverse effect on crop development.