Agent Name

Metribuzin

CAS Number

21087-64-9

Formula

C8-H14-N4-O-S

Major Category

Pesticides

Synonyms

1,2,4-Triazin-5-one, 4-amino-6-tert-butyl-3-(methylthio)-; 3-Methylthio-4-amino-6-tert-butyl-1,2,4-triazin-5-one; 4-Amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one; 4-Amino-6-tert-butyl-3-(methylthio)-1,2,4-triazin-5-one; 4-Amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H)-one; 4-Amino-6-tert-butyl-3-methylthio-1,2,4-triazin-5(4H)-one; 4-Amino-6-tert-butyl-4,5-dihydro-3-methylthio-1,2,4-triazin-5-one; BAY 61597; BAY dic 1468; Bay 94337; Bayer 6159H; Bayer 6443H; Bayer 94337; DIC 1468; Lexone; Lexone 4L; Lexone DF; Metribuzin; Metribuzine; Metribuzine [ISO-French]; NTN 70; Sencor; Sencor 4F; Sencor DF; Sencorex; Sencorex L.F.; Senkor; Zenkor; [ChemIDplus]

Category

Herbicides, Triazine

Description

Colorless, crystalline solid. [herbicide]; [NIOSH]

Sources/Uses

Metribuzin is a herbicide used to control weeds in alfalfa, asparagus, barley, carrots, corn, peas, potatoes, soybeans, sugarcane, tomatoes, turf grass, and wheat. [ACGIH]

Comments

Classified as "slightly toxic" with an LD50 in rats of 1090 to 2300 mg/kg; [EXTOXNET] There are no known health effects in humans after occupational exposure. [ACGIH] For the triazine herbicides, systemic toxicity unlikely unless large amounts are ingested; May cause irritation; [EPA Pesticides, p. 121]

Reference Link

EXTOXNET PIP - METRIBUZIN

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

5 mg/m3

Vapor Pressure

4.0E-7 mm Hg

Reference Link

EPA Pesticide Chemical Search

Adverse Effects
Hepatotoxin

Hepatotoxin, Secondary

ACGIH Carcinogen

Not Classifiable

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

Search ChemIDplus

Related Information in HazMap
Processes

Industrial Processes with risk of exposure: