Mercuric cyanide

  • Cianurina
  • Mercury cyanide
  • Mercury dicyanide
Formula
Hg(CN)2
Structure
Description
Odorless tetragonal crystals or white powder.
Uses
In germicidal soaps, manufacturing cyanogen gas, in photography.

Registry Numbers and Inventories.
CAS
592-04-1
EC (EINECS/ELINCS)
209-741-6
RTECS
OW1515000
RTECS class
Agricultural Chemical and Pesticide; Human Data
UN (DOT)
1636
Merck
12,5928
Beilstein/Gmelin
4652800
Beilstein Reference
4-02-00-00050
RCRA
P030
Swiss Giftliste 1
G-2823
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2HgN2
Formula mass
252.63
Melting point, °C
3.77
Decomposition point, °C
320
Vapor pressure, mmHg
0.0012
Vapor density (air=1)
8.7
Odor Threshold Odor threshold Odorless
Density
3.77 g/cm3
Solubility in water
Soluble

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Poison room locked. Keep containers tightly closed. Store protected from light.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation. Store protected from light. Avoid mechanical shock and friction.
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
Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal temperatures and pressures. Friction and impact senstive explosive.
Incompatibilities
Strong oxidizing agents, acids.
Decomposition
Hydrogen cyanide, nitrogen oxides, carbon monoxide, carbon dioxide, mercury/mercury oxides.

Fire.
Flash Point,°C
320
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. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
Nonflammable, but when heated to decomposition, or on contact with acid, it releases flammable toxic hydrogen cyanide.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
Fumes from fire may contain toxic mercury and hydrogen cyanide.
Health
3
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
NIOSH REL: C 0.1 mg/m3 [skin] OSHA PEL: C 0.1 mg/m3 10 mg/m3 (as Hg)
Poison_Class
1
Exposure effects
Chronic ingestion may cause accumulation of mercury in body tissues. Chronic exposure to mercury compounds may produce immunologic glomerular disease. Chronic exposure to cyanide solutions may lead to the development of a cyanide rash, characterized by itching, and by macular, papular, and vesicular eruptions, and may be accompanied by secondary infections.
   Ingestion
May be fatal if swallowed. Causes gastrointestinal irritation with nausea, vomiting and diarrhea. Metabolism may release cyanide, which may result in headache, dizziness, weakness, collapse, unconsciousness and possible death. Inorganic mercury compounds may cause central and peripheral nervous system effects.
   Inhalation
Causes respiratory tract irritation with possible burns. Acute exposure to high concentrations of mercury vapors may cause severe respiratory tract irritation.
   Skin
Causes skin irritation and possible burns.
   Eyes
Exposure to mercury or mercury compounds can cause discoloration on the front surface of the lens, which does not interfere with vision. Causes eye irritation and possible burns.

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 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.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   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
1636
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
MCN
 
Std. Transport #
4923246