Quinhydrone

  • 2,5-Cyclohexadiene-1,4-dione compound with 1,4-Benzenediol (1:1)
Formula
C6H4O2.C6H6O2
Structure
Description
Dark green solid.
Uses
Substance is used in pH determinations (quinhydrone electrode).

Registry Numbers and Inventories.
CAS
106-34-3
EC (EINECS/ELINCS)
203-387-6
EC Class
harmful, dangerous for the environment
R 22 36/37/38
S 22 26 36/37/39
RTECS
VA4550000
RTECS class
Other
UN (DOT)
1325
Merck
12,8242
Beilstein/Gmelin
3919222
Beilstein Reference
4-07-00-02065
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C12H10O4
Formula mass
218.21
Melting point, °C
168 - 171
Vapor pressure, mmHg
0.003 (44 C)
Vapor density (air=1)
7.6
Density
1.35 g/cm3
Solubility in water
Slightly soluble
Heat of vaporization
88.6 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Do not ingest or inhale.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container.
Disposal code
3
Stability
Stable under normal temperatures and pressures. Substances with similar functional groups form explosive peroxides.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.
Fire potential
Flammable/combustible material. May be ignited by friction, heat, sparks or flames.
Combustion products
Fire may produce irritating and/or toxic gases.

Health.
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Ingestion
Harmful if swallowed. May cause irritation of the digestive tract. Ingestion may lower metabolism.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid.
   Inhalation
Remove from exposure to fresh air immediately. Get medical aid if cough or other symptoms appear.
   Skin
Get medical aid if irritation develops or persists. Flush skin with plenty of soap and water.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1325
Response guide
Hazard class
4.1
Packing Group
II; III
 
HS Code
2942 00 00