Supracide

  • S-(2,3-Dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3-methyl)dimethylphosphorothiolothionate
  • Methidathion
  • Ultracid
  • Ultracide
Formula
C6H11N2O4PS3
Structure
Description
Colorless crystals.
Uses
Methidathion is used in the control of scale insects, leaf eaters, and some mites.

Registry Numbers and Inventories.
CAS
950-37-8
EC (EINECS/ELINCS)
213-449-4
EC Index Number
015-069-00-2
EC Class
Very toxic; Harmful; Dangerous for the Environment
RTECS
TE2100000
RTECS class
Agricultural Chemical and Pesticide; Mutagen; Human Data; Primary Irritant
UN (DOT)
2784
Merck
12,6048
Beilstein/Gmelin
619915
EPA OPP
100301
Swiss Giftliste 1
G-1517
Austrailia AICS
Listed
Korea ECL
Listed

Properties.
Formula
C6H11N2O4PS3
Formula mass
302.34
Melting point, °C
39-40
Vapor pressure, mmHg
0.000001
Density
1.495 g/cm3 (20 C)
Solubility in water
at 20 C: 250 mg/L
Partition coefficient, pKow
2.47

Hazards and Protection.
Storage
Store at in dry place above 32 degrees F to prolong shelf-life.
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 protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
(Non-Specific -- Organophosphorus Pesticide, n.o.s.) Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Do not touch spilled material; stop leak if you can do so without risk. Use water spray to reduce vapors. Small spills: absorb with sand or other noncombustible absorbent material and place into containers for later disposal. Small dry spills: with clean shovel place material into clean, dry containers and cover; move containers from spill area. Large spills: dike far ahead of spill for later disposal.
Stability
No data.

Fire.
Fire fighting
(Non-Specific -- Organophosphorus Pesticide, n.o.s.) Stay upwind; keep out of low areas. Move container from fire area if you can do so without risk. Fight fire from maximum distance. Dike fire control water for later disposal; do not scatter the material. Wear positive pressure breathing apparatus and special protective clothing.(Non-Specific -- Organophosphorus Pesticide, n.o.s.) This material may burn, but does 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
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
Hazards
Container may explode in heat of fire. Fire and runoff from fire control water may produce irritating or poisonous gases. Stable in neutral or weak acid solution. Hydrolyzed by alkali.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
2
Exposure effects
Fever, low heart rate and abnormally low blood pressure, or rapid heart rate and elevated blood pressure may occur. Headache, dizziness, muscle spasms and profound weakness are common. Alterations of level of consciousness, anxiety, paralysis, seizures and coma may occur. Seizures may be more common in children.
   Ingestion
Vomiting, hypersalivation, diarrhea, fecal incontinence and abdominal pain may occur.
   Inhalation
Dyspnea, rales, bronchorrhea, bronchospasm, or tachypnea may be noted. Noncardiogenic pulmonary edema may occur in severe cases. Chemical pneumonitis may be seen.
   Skin
Sweating is a consistent but not universal sign.
   Eyes
Constriction of the pupil, tearing, and blurred vision are common. Prolonged dialation of the pupils may occur in severe poisonings. Opsoclonus has been reported in one case. Salivation commonly occurs.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes.
   Skin
Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush with running water for at least 20 minutes. Wash skin with soap and water.
   Eyes
In case of contact with substance, immediately flush with running water for at least 20 minutes.

Transport.
UN number
2784
Response guide
Hazard class
3
Packing Group
I; II
 
USCG CHRIS Code
MDT