Common name: Chloridazon
Chemical name: 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone
Structural formula:
Molecular formula: C10H8ClN3O
Chemical class: Pyridazinone herbicides
CAS No.: 1698-60-8
Properties:
Form: Colorless, odorless solid
Melting point: 206℃
Vapour pressure: ＜1×10-2mPa
Solubility in water: 0.34g/l (20℃)
Solubility in solvents: Ethyl acetate 3.7g/l, methanol 15.1g/l, toluene 0.1g/l, dichloromethane 1.9g/l (all at 20℃).
Stability: Stable up to 50℃ for ≥2 years. Stable in aqueous media at pH 3-9.
Toxicity:
Acute oral LD50 for rats: male 3830mg/kg, female 2140mg/kg
Acute dermal LD50 for rats: ＞2000mg/kg
Inhalation LC50 for rats: 5.4mg/l
No irritation to eyes and skin.
Non-mutagenic, non-teratogenic, non-carcinogenic.
Ecotoxicology:
Effects on aquatic organisms: bulltrout LC50 36-42mg/l, bluegill sunlight 93mg/l (96h), daphnia EC50 132mg/l(48h), algae EC50 1.9mg/l(120h).
Effects on bees: not toxic to bee,LD50 ＞200μg/bee (48h, oral and contact)
Effects on birds: mallard ducks LD50 4260mg/kg, bobwhite quail LD50＞2000mg/kg
Effects on earthworms: LC50 1050mg/kg (14d)
Environmental fate: In soil, microbial degradation involves splitting off the N-glucosyl group, to give 5-amino-4-chloropyridazin-3(2H)-one, which is not herbicide-active. Persists in soil for 6-8 weeks under sufficiently moist conditions.
Mode of action:
Selective systemic herbicide, rapidly absorbed by the roots, with translocation acropetally to all plant parts.
Usage:
Control of annual broad-leaved weeds in sugar beet, fodder beet and beetroor, by application pre-plant incorporate, pre-emergence, or post-emergence.
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