Bentazone

  • Bendioxide
  • 3-Isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide
  • 1H-2,1,3-Benzothiadiazin-4(3H)-one, 3-(1-methylethyl)-, 2,2-dioxide
Formula
C10H12N2O3S
Structure
Description
Colorless crystals. Odorless.
Uses
Substance is used as a herbicide.

Registry Numbers and Inventories.
CAS
25057-89-0
EC (EINECS/ELINCS)
246-585-8
EC Index Number
613-012-00-1
EC Class
Harmful; Irritant; Sensitising; Dangerous for the Environment
RTECS
DK9900000
RTECS class
Agricultural Chemical and Pesticide; Mutagen; Reproductive Effector
Merck
12,1080
Beilstein/Gmelin
530220
EPA OPP
275200
Swiss Giftliste 1
G-5772
Canada DSL/NDSL
DSL
US TSCA
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C10H12N2O3S
Formula mass
240.28
Melting point, °C
137-139
Boiling point, °C
357
Decomposition point, °C
200
Vapor pressure, mmHg
<0.0001
Critical temperature
584
Critical pressure
33.2
Density
1.47 g/cm3 (20 C)
Solubility in water
Insoluble
pKa/pKb
3.3 (pKa)
Partition coefficient, pKow
2.80

Hazards and Protection.
Storage
Keep closed in a cool, dry location.
Handling
Do not wear contact lenses. Avoid contact with sking, eyes and clothings.
Protection
Goggles, impermeable gloves and apron, protective clothing and boots when handling the undiluted product.
Respirators
OSHA approved respirator.
Small spills/leaks
Evacuate area. Wear appropriate protective equipment. Ventilate area. Sweep up and place in a appropriate container. Wash contaminated surfaces to remove any residue.
Stability
Stable at normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
When heated to decomposition it emits very toxic fumes of sulfur oxides and nitrogen oxides.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use agent most appropriate to extinguish fire.

Health.
Poison_Class
4
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Inhalation
Causes irritation to mucous membranes.
   Skin
Irritation. Harmful if absorbed.
   Eyes
Redness, pain.

First aid
 
   Ingestion
The possible benefit of early removal of some ingested material by cautious gastric lavage must be weighed against potential complications of bleeding or perforation. Activated charcoal activated charcoal binds most toxic agents and can decrease their systemic absorption if administered soon after ingestion. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove contaminated clothing. Wash exposed area with soap and water. If symptoms persist, seek medical attention. Launder clothing before reuse.
   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.
USCG CHRIS Code
BGS