Chemical Identification
Common Name
Metosulam
中文通用名
磺草唑胺
IUPAC
2',6'-dichloro-5,7-dimethoxy-3'-methyl[1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonanilide
CAS
N-(2,6-dichloro-3-methylphenyl)-5,7-dimethoxy[1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonamide
CAS No.
[139528-85-1]
Molecular Formula
C14H13Cl2N5O4S
Molecular Structure
Category
Activity
Herbicide.Metosulam can be applied pre- and early post-emergence (between two and four true leaves) in maize and post-emergence in winter small-grain cereals. It controls atrazine-resistant weeds. Adjuvants improve activity in maize, but make no difference in small grains. Metosulam acts slightly slower at low temperatures.

In field trials, metosulam has shown good selectivity to target crops and rotational crops.
CropUse
CropUses:
cereals, maize, rice, lupins

10-15 g ai/ha

Maize: 25 g ai/ha

Premix

Type

AI concn

Suspension concentrate (SC)

10% (w/v)

Water-dispersible granule (WG)

71.4% (w/w)

Physical Properties
Molecular weight:418.3; Physical form:Cream to tan coloured powder. Density:1.49 (20 °C); Melting point:210-211.5 °C; Vapour pressure:4 × 10-10 (20 °C, Knudsen effusion); Partition coefficient(n-octanol and water):logP = 0.9778 (distilled water), 2.12 ( 5), 2.46 ( 7), 3.08 ( 9) (all at 20 °C); pKa:4.8; Solubility:In water 200 (distilled water, 7.5), 100 ( 5.0), 700 ( 7.0), 5600 ( 9.0) (all in /l, 20 °C). In acetone, acetonitrile and dichloromethane >5.0 g/l; in n Little photolytic instability (50 140 d - Xenon Arc); stable to hydrolysis across environmentally normal range.;
Toxicology
Oral:Acute oral LD50 for rats and mice >5000 /. Percutaneous:Acute percutaneous LD50 for rabbits >2000 /kg. Not a skin sensitiser (guinea pigs). Inhalation:
Environmental Profile

Mallard duck

LD50 >2,000 mg/kg Bobwhite quail LD50 >2,250 mg/kg

Rainbow trout [96 hrs]

LC50 >100mg/litre Bluegill [96 hrs] LC50 >170μg/litre

Fate in :
The LC50 values for Rainbow trout and Bluegill represent the solubility limit.


Fate in soil:
Metosulam is degraded by microbes; the half-life in soil is less than 11 days (dependent on soil type). It has limited mobility in all soil types.

Fate in aquatic systems:
Metosulam is degraded photochemically (half-life 140 days) and by hydrolysis (half-life >30 days) in water.

Transport Information
Hazard Class:III(Slightly hazardous)

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