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21087-64-9

Basic Information
CAS No.: 21087-64-9
Name: Metribuzin
Molecular Structure:
Molecular Structure of 21087-64-9 (Metribuzin)
Formula: C8H14N4OS
Molecular Weight: 214.28
Synonyms: 4-Amino-6-tert-butyl-3-(methylthio)-1,2,4-triazin-5(4H)-one;4-Amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one;Bay 94337;Bayer 6159H;Lexone 4L;Lexone 75DF;Preview;Salute;Sencor 4L;Sencor 75DF;Sencoral;
EINECS: 244-209-7
Density: 1.31 g/cm3
Melting Point: 125 °C
Boiling Point: 312.4 °C at 760 mmHg
Flash Point: 142.7 °C
Solubility: slightly soluble in water
Appearance: colorless crystalline solid
Hazard Symbols: HarmfulXn,DangerousN,FlammableF
Risk Codes: 22-50/53-36-20/21/22-11
Safety: 2-60-61-36-26-16
Transport Information: UN 3077 9/PG 3
PSA: 99.10000
LogP: 0.95270
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Chemistry

Molecular structure of Metribuzin (CAS NO.21087-64-9) is:

Product Name: Metribuzin
CAS Registry Number: 21087-64-9
IUPAC Name: 4-amino-6-tert-butyl-3-methylsulfanyl-1,2,4-triazin-5-one
Molecular Weight: 214.28796 [g/mol]
Molecular Formula: C8H14N4OS
XLogP3: 1.7
H-Bond Donor: 1
H-Bond Acceptor: 4
EINECS: 244-209-7
Melting Point: 125 °C
Water Solubility: Slightly soluble 
Surface Tension: 47.4 dyne/cm
Density: 1.31 g/cm3
Flash Point: 142.7 °C
Enthalpy of Vaporization: 55.34 kJ/mol
Boiling Point: 312.4 °C at 760 mmHg
Vapour Pressure: 0.000531 mmHg at 25°C
Product Categories: Herbicide; Endocrine Disruptors (Draft)Alphabetic; METI - MZPesticides&Metabolites; Triazinone structure; Alpha sort; Endocrine Disruptors (Draft)Pesticides&Metabolites; EPA; Herbicides; H-MAlphabetic; M; Method Specific

Uses

 Metribuzin (CAS NO.21087-64-9) can be used as an herbicide. Also it is widely applied in potatoes,tomatoes,sugarcane,asparagus,pineapple.

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
cat LD50 oral > 500mg/kg (500mg/kg)   "Agrochemicals Handbook," with updates, Hartley, D., and H. Kidd, eds., Nottingham, Royal Soc of Chemistry, 1983-86Vol. A280, Pg. 1983,
guinea pig LD50 oral 250mg/kg (250mg/kg)   "Wirksubstanzen der Pflanzenschutz und Schadlingsbekampfungsmittel," Perkow, W., Berlin, Verlag Paul Parey, 1971-1976Vol. -, Pg. -, 1971/1976.
mouse LC inhalation > 860mg/m3/4H (860mg/m3)   "Documentation of the Threshold Limit Values and Biological Exposure Indices," 5th ed., Cincinnati, OH, American Conference of Governmental Industrial Hygienists, Inc., 1986Vol. 6, Pg. 1042, 1991.
mouse LD50 intraperitoneal 210mg/kg (210mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) Pesticide Biochemistry and Physiology. Vol. 23, Pg. 123, 1984.
mouse LD50 oral 564mg/kg (564mg/kg)   Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of Japan. Vol. 12, Pg. 127, 1987.
mouse LD50 skin > 1gm/kg (1000mg/kg)   Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of Japan. Vol. 12, Pg. 127, 1987.
mouse LD50 subcutaneous 367mg/kg (367mg/kg)   Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of Japan. Vol. 12, Pg. 127, 1987.
quail LD50 oral 164mg/kg (164mg/kg)   Pesticide Manual. Vol. 8, Pg. 573, 1987.
quail LD50 unreported 168mg/kg (168mg/kg)   Farm Chemicals Handbook. Vol. -, Pg. C204, 1991.
rabbit LD50 skin > 20gm/kg (20000mg/kg)   Farm Chemicals Handbook. Vol. -, Pg. C204, 1991.
rat LC50 inhalation > 860mg/m3/4H (860mg/m3)   Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of Japan. Vol. 12, Pg. 127, 1987.
rat LD50 intraperitoneal 239mg/kg (239mg/kg)   Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of Japan. Vol. 12, Pg. 127, 1987.
rat LD50 oral 1100mg/kg (1100mg/kg)   Farm Chemicals Handbook. Vol. -, Pg. C204, 1991.
rat LD50 skin 2gm/kg (2000mg/kg)   "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1001, 1986.
rat LD50 subcutaneous 814mg/kg (814mg/kg)   Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of Japan. Vol. 12, Pg. 127, 1987.

Safety Profile

Poison by ingestion and intraperitoneal routes. Low toxicity by skin contact. When heated to decomposition it emits very toxic fumes of NOx and SOx
Hazard Codes: HarmfulXn,DangerousN,FlammableF
Risk Statements: 22-50/53-36-20/21/22-11 
R22:Harmful if swallowed. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
R36:Irritating to eyes. 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
R11:Highly flammable.
Safety Statements: 2-60-61-36-26-16 
S2:Keep out of the reach of children. 
S60:This material and its container must be disposed of as hazardous waste. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets. 
S36:Wear suitable protective clothing. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S16:Keep away from sources of ignition.
RIDADR: UN3077 9/PG 3
RTECS: XZ2990000

Specification

 Metribuzin , its cas register number is 21087-64-9. It also can be called 4-Amino-6-tert-butyl-3-(methylthio)-1,2,4-triazin-5(4H)-one ; 4-Amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one ; Bay 94337 ; Bayer 6159H ; Lexone 4L ; Lexone 75DF ; Preview ; Salute ; Sencor 4L ; Sencor 75DF ; Sencoral . It is a colorless crystalline solid.And it is A triazine derivative.