Product Identification

Product Name

2-Thiobarbituric acid

Synonyms

2-Mercaptobarbituric acid
2-Thio-4,6-dioxypyrimidine
4,6-Dihydroxy-2-mercaptopyrimidine
Austranal
Bathyran
Dihydro-2-thioxo-4,6(1H,5H)-pyrimidinedione

CAS

504-17-6

Formula

C4H4N2O2S

Molecular Weight

144.15

EINECS

207-985-8

RTECS

CQ7700000

RTECS Class

Other

Beilstein/Gmelin

120663

Beilstein Reference

5-24-09-00108

Physical and Chemical Properties

Appearance

Slightly yellow liquid. With a stench.

Solubility in water

Very soluble

Melting Point

235

Boiling Point

419

Density

1.661 g/cm3

pKa/pKb

3.96 (pKa)

Partition Coefficient

-.81

Usage

Reagent for measuring the extent of lipid peroxidation in foods.

First Aid Measures

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. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.

Skin

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Handling and Storage

Storage

Store in a tightly closed container. Keep under a nitrogen blanket. Store in a cool, dry, well-ventilated area away from incompatible substances.

Handling

Wash thoroughly after handling. Use only in a well ventilated area. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.

Hazards Identification

Ingestion

Expected to be a low ingestion hazard. May cause nausea and vomiting.

Inhalation

May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.

Skin

May cause skin irritation.

Eyes

May cause eye irritation.

EC Risk Phrase

R 36/37/38

EC Safety Phrase

S 26 36

Exposure Controls/Personal Protection

Personal 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.

Fire Fighting Measures

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 appropriate foam.

Accidental Release Measures

Small spills/leaks

Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal.

Stability and Reactivity

Disposal Code

3

Stability

No data.

Incompatibilities

Stttrong oxidizing agents.

Decomposition

Nitrogen oxides, carbon monoxide, oxides of sulfur, carbon dioxide.

Transport Information

HS Code

2933 59 95