Metsulfuron-Methyl

  • 2-(((((4-Methoxy-6-methyl-1,3,5-triazin-2yl)amino)carbonyl)amino)sulfonyl) benzoic acid methyl ester
  • N-((4-methoxy-6-methyl-1,3,5-triazin-2-yl)aminocarbonyl)-2- methoxycarbonylbenzenesulfonamide
  • Granstar
  • Escort
  • Brush-off
  • Ally
Formula
C14H15N5O6S
Structure
Description
White crytals.
Uses
Herbicide.

Registry Numbers and Inventories.
CAS
74223-64-6
EC Index Number
613-139-00-2
RTECS
DH3563000
RTECS class
Agricultural Chemical and Pesticide; Reproductive Effector
UN (DOT)
2763
Merck
12,6244
Beilstein/Gmelin
587472
Beilstein Reference
5-26-09-00406
EPA OPP
122010
Swiss Giftliste 1
G-82380
New Zealand
Listed

Properties.
Formula
C14H15N5O6S
Formula mass
381.37
Melting point, °C
169
Boiling point, °C
593
Vapor pressure, mmHg
3E-12
Density
1.47 g/cm3 (20 C)
pKa/pKb
3.3 (pKa)
Partition coefficient, pKow
1.89

Hazards and Protection.
Storage
Store in a cool, dry area. Do not contaminate water, food, or feed by storage. Keep from contact with fertilizers, insecticides, fungicides, and seeds during storage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
Stable in air to about 140 C. It is hydrolysed in acid solution, 50% loss (25 C) occurs in 15 hr at pH 2, 33 days at pH 5, > 41 days at pH 7 and pH 9, but is more rapid at 45 C.

Fire.
Fire fighting
Use method most appropriate to fight surrounding fire.
Fire potential
Non-Combustible
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
5
Exposure effects
Coma was reported following ingestion of an herbicide containing atrazine, aminotriazole, ethylene glycol, and formaldehyde. Muscle tremors, tetany, and ataxia have been reported in animals following ingestions of triazine herbicides.
   Inhalation
Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Effects of contact or inhalation may be delayed.
   Skin
Avoid any skin contact. See Inhalation.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
2763
Response guide
Hazard class
6.1
Packing Group
I; II; III