BISPYRIBAC-SODIUM

Common name: Bispyribac-sodium

Chemical name: 2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]benzoate

Trade name: Grass-short, Nominee, Regiment, Short-keep(Brand name of Kumiai Chemical Industry Co., Ltd.)

Molecular formula：C₁₉H₁₇N₄NaO₈

Chemical structure：

Physical and chemical properties:

Molecular weight:452.4; Physical form: White powder. Density: Bulk density 0.0737 (20 °C, CIPAC MT 3); Composition: Tech. is >93%. Melting point:223-224 °C; Vapour pressure:5.05×10-6 mPa (25 °C); Henry constant:3.12×10-11 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water): logP = -1.03 (23 °C); pKa:3.05; Solubility: In water 73.3 g/l (25 °C). In methanol 26.3, acetone 0.043 g/l (25 °C).; Stability: Stable in water; DT50 >1 y ( pH 7 - 9), 448 h (pH 4). Stable to light. Not decomposed after 14 d at 55 °C. Slight to moderately soluble in organic solvents.

Purity: 95%, 98%

Mode of actions:

Bispyribac-sodium is a broad-spectrum herbicide that controls annual and perennial grasses, broadleaf weeds and sedges.

Crop uses:

noncrop uses, rice, turf

Rice: 15-40 g ai/ha (water-seeded rice) Rice: 20-60 g ai/ha (dry-seeded rice) Turf: 12-148 g ai ha

Growth regulator use: 90-150 g ai/ha

Toxicology:

Oral: Acute oral LD50 for male rats 4111, female rats 2635 mg/kg, male and female mice 3524 mg/kg. Percutaneous: Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin; slightly irritating to eyes (rabbits). Inhalation:LC50(4 h) for rats >4.48 mg/l. ADI:(JMPR) 0.125 mg/kg[1967].

Environmental profile

Ecotoxicology: Algae:EC50 (120 h) for Selenastrum capricornutum 3.4 mg/l, NOEC 0.625 mg/l.Bees:LD50 (oral) >200 mg/bee; LC50(contact) >7000 mg/l spray. Birds: Acute oral LD50 for bobwhite quail >2250 mg/kg. Dietary LC50(5 d) for bobwhite quail and mallard ducks >5620 mg/kg diet.Daphnia:LC50(48 h) >100 ppm. Fish: Acute LC50 (96 h) for rainbow trout and bluegill sunfish >100 ppm. Worms: NOEL (14 d) for Eisenia foetida >1000 mg/kg soil.

Environmental fate: Animals:>95% of dose applied to rats was excreted in urine and faeces within 7 d. Soil: In soil, DT50<10 d (flooded and upland conditions). Plant: Following application to foliage and soil at 5-leaf stage of rice plants, c. 10% of carbon label was distributed between straw and roots at harvest.

Bluegill sunfish LC50 >100 mg/L Rainbow trout LC50 >100 mg/L Carp LC50 >100 mg/L Daphnia LC50 >100 mg/L Fate in :

Fate in soil:

Bispyribac-sodium is rapidly degraded in soil. The soil half-life is estimated to be 7 to 15 weeks.

Fate in aquatic systems:

Bispyribac-sodium is degraded photochemically in water.

WATER SOLUBILITY: At 20°C: 73.3 g/l; 1% w/v in water (Regiment*)

Transportation information:

Signal Word: CAUTION; Hazard Class: III (Slightly hazardous)

Other products:

Straight formulated products: Bispyribac-sodium 10%, 20%, 40% SC;

Bispyribac-sodium 20%, 80% WP

Mixtures:

Bensulfuron-methyl+bispyribac-sodium Cyhalofop-butyl+Bispyribac-sodium