Methylmercuric dicyanamide

  • Agrosol
  • (Cyanoguanidino)methylmercury
  • Cyano(methylmercuri)guanidine
  • n-Cyano-N'-(methylmercury)guanidine
  • Mema
  • Methylmercuric cyanoguanidine
Formula
C3H6HgN4
Structure
Description
Crystals.
Uses
Fungicide.

Registry Numbers and Inventories.
CAS
502-39-6
EC (EINECS/ELINCS)
207-935-5
RTECS
OW1750000
RTECS class
Agricultural Chemical and Pesticide; Organometallic; Reproductive Effector
UN (DOT)
2024
Beilstein/Gmelin
5399534
RCRA
D009
EPA OPP
51909
Swiss Giftliste 1
G-2825

Properties.
Formula
C3H6HgN4
Formula mass
298.70
Melting point, °C
156.1
Vapor pressure, mmHg
0.000065
Solubility in water
21,7 g/L (20 C)

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate clothing to prevent any possibility of skin contact. Wear eye protection to prevent any possibility of eye contact. Employees should wash immediately when skin is wet or contaminated. Work clothing should be changed daily if it is possible that clothing is contaminated. Remove non-impervious clothing immediately if wet or contaminated. Provide emergency showers and eyewash.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
(Non-Specific -- Mercury-Based Pesticide n.o.s.) Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering. Remove and isolate contaminated clothing at the site. Do not touch spilled material. Use water to reduce vapors. In event of spill or leak: take up with absorbent material and place in containers with covers. Small dry spill: with clean shovel place material into clean, dry container and cover; move containers from spill area. Dike far ahead of spill if large.
Stability
No data.
Incompatibilities
Incompatible with strong oxidizing agents such as chlorine.

Fire.
Fire fighting
(Non-Specific -- Mercury-Based Pesticide, n.o.s.) Fight fire from maximum distance. Dike fire control water for later disposal. Wear positive pressure breathing apparatus and special protective clothing.(Non-Specific -- Mercury-Based Pesticide, n.o.s.) This material may burn but will not ignite readily. For small fires, use dry chemical, carbon dioxide, water spray, or foam. For large fires, use water spray, fog, or foam.
Fire potential
This material may burn but does not ignite readily.
Combustion products
When heated to decompose it emits toxic fumes of hg and nitrogen oxides.

Health.
Exposure limit(s)
IDHL: 2 mg/m3 (as Hg)
Carcinogin
I-2B, CP65
Poison_Class
1
Exposure effects
Sudden and profound circulatory collapse with rapid heart rate, abnormally low blood pressure, and peripheral vasoconstriction can occur from acute inorganic mercury poisoning and might occur with methylmercuric dicyanamide. Peripheral neuropathy and brain damage can occur even from acute exposures. Organic mercurials are human teratogens and can induce severe neurological defects. An increase in the incidence of spontaneous abortions and menstrual dysfunction have been reported in women. Mercury crosses the placental barrier and is found in human breast milk.
   Inhalation
Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Effects of contact or inhalation may be delayed.
   Skin
Skin irritation is reported, as well as blistering, with prolonged exposure.
   Eyes
Some mercuric compounds are corrosive to the eyes and throat.

First aid
 
   Ingestion
Administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove contaminated clothing and wash exposed area extremely thoroughly with soap and water. A physician may need to examine the area if irritation or pain persists after washing. Take precautions to avoid exposure of health care professionals and other individuals. Systemic effects some chemicals can produce systemic poisoning by absorption through intact skin. Carefully observe patients with dermal exposure for the development of any systemic signs or symptoms and administer symptomatic treatment as necessary. Administration of chelators may be required. Provide supportive care. See treatment of dermal exposure in the main body of this document for complete information.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility. Observe for development of clinical signs and symptoms and follow treatment recommendations in dermal exposure where appropriate.

Transport.
UN number
2024
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
USCG CHRIS Code
MDM