Pamoic acid

  • Embonic acid
  • Bis(2-hydroxy-3-carboxy-1-naphthyl)methane
  • 4,4'-Methylenebis[3-hydroxy-2-naphthoic acid]
  • 2,2'-Dihydroxy-1,1'-dinaphthylmethane-3,3'-dicarboxylic acid
  • 2-Naphthalenecarboxylic acid, 4,4'-methylenebis[3-hydroxy-
Formula
C23H16O6
Structure
Description
Odorless yellow solid

Registry Numbers and Inventories.
CAS
130-85-8
EC (EINECS/ELINCS)
204-998-0
RTECS
QL2180000
RTECS class
Drug; Primary Irritant
Merck
12,7136
Beilstein/Gmelin
901319
Beilstein Reference
4-10-00-02362
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C23H16O6
Formula mass
388.38
Melting point, °C
295 - 300
Solubility in water
Insoluble
pKa/pKb
2.67 (pKa)
Partition coefficient, pKow
4.46

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. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation.
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. Avoid generating dusty conditions.
Disposal code
4
Stability
No data.
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.

Health.
Exposure effects
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause skin irritation.
   Eyes
Causes 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.
HS Code
2918 29 90