Iodine

Formula
I2
Structure
Description
Solid iodine is greyish-black to purple with a metallic luster. It has a characteristic, irritating odor.
Uses
Catalyst in alkylation & condensation of aromatic amines, in sulfonation & sulfations, manufacture of germicides, antiseptics, important reagent in analytical chemistry, artificial isotopes of iodine are used in biological, biochemical & chemical structure research, reduces friction of hard surfaces, incl stainless steel & glass.

Registry Numbers and Inventories.
CAS
7553-56-2
EC (EINECS/ELINCS)
231-442-4
EC Index Number
053-001-00-3
EC Class
Harmful; Dangerous for the Environment
R 20/21 50
S 23 25 61
RTECS
NN1575000
RTECS class
Reproductive Effector; Human Data
UN (DOT)
1759
Merck
13,5036
Beilstein/Gmelin
1160 (G)
EPA OPP
46905
Swiss Giftliste 1
G-1717
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
I2
Formula mass
253.81
Melting point, °C
114
Boiling point, °C
184.3
Vapor pressure, mmHg
0.31 (25 C)
Vapor density (air=1)
4.4
Saturation Concentration
400 ppm at 20 C (calc)
Odor Threshold Odor threshold 9.00 mg/m3
Critical temperature
546
Critical pressure
115
Density
4.9 g/cm3
Solubility in water
100 mg/L
Viscosity
2.27 cp (116C)
Partition coefficient, pKow
2.49
Heat of fusion
12.4 kJ/mol
Heat of vaporization
41.7 kJ/mol

Hazards and Protection.
Storage
Do not store near combustible materials. Keep away from food and drinking water. Keep away from strong acids. Keep away from metals. Keep away from reducing agents.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Keep container tightly closed. Avoid contact with clothing and other combustible materials. Do not get on skin or in eyes. 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 impervious gloves. 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 runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal shipping and handling conditions.
Incompatibilities
Powdered aluminum, active metals. Acetylene, acetaldehyde cause explosive reactions. Iodine reacts with ammonium hydroxide to form shock sensitive compounds that are explosive when dry.
Decomposition
Hydrogen iodide, iodine.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Material will not burn. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Containers may explode when heated. Extinguishing media: Use water spray to cool fire-exposed containers. Substance is noncombustible; use agent most appropriate to extinguish surrounding fire.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
When heated to decomposition it emits highly toxic fumes of iodine and various iodine compounds.
Health
3
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: 0.1 ppm; 1 mg/m3 as CEILING (ACGIH 1994). OSHA PEL: C 0.1 ppm (1 mg/m3) NIOSH REL: C 0.1 ppm (1 mg/m3) NIOSH IDLH: 2 ppm
Poison_Class
2
Exposure effects
Prolonged or repeated exposure may cause adverse reproductive effects. Chronic exposure can lead to iodism characterized by salivation, nasal discharge, sneezing, conjunctivitis, fever, laryngitis, bronchitis, stomatitis, and skin rashes. Chronic exposure can affect thyroid function. May cause kidney damage.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May cause kidney damage. May cause burns to the digestive tract. May cause thyroid abnormalities.
   Inhalation
May cause irritation of the respiratory tract with burning pain in the nose and throat, coughing, wheezing, shortness of breath and pulmonary edema. May cause epiphoria, which is an excessive flow of tears.
   Skin
Causes skin burns. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material.
   Eyes
Causes severe eye irritation. May cause eye burns. Vapor or mist may cause irritation and severe burns.

First aid
 
   Ingestion
Do NOT induce vomiting. 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 immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid immediately. Rinse area with large amounts of water for at least 15 minutes. Remove contaminated clothing and shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1759
Response guide
Hazard class
8
Packing Group
I; II; III
 
HS Code
2801 20 00