919-86-8 Usage
Description
Demeton-S-methyl is pale yellow in colour and oily and has a sulphur-like odour. It is
sparingly soluble in water but very rapidly soluble in common polar organic solvents such
as dichloromethane, 2-propanol, toluene, and n-hexane. It is a highly toxic, systemic, and
contact insecticide and acaricide and classified as Category I. It is used for the control of
insects, aphids, sawflies, and spider mites on cereals, fruits, vegetables, and ornamental
plants. On heating, demeton-S-methyl undergoes decomposition and emits very toxic
fumes, phosphorus oxides, and sulphur oxides.
Chemical Properties
Demeton-S-methyl is pale yellow in color, oily and has a sulfur-like odor. It is sparingly
soluble in water, but is very rapidly soluble in common polar organic solvents, such as
dichloromethane, 2-propanol, toluene, and n-hexane. It is a highly toxic, systemic, and
contact insecticide and acaricide and is classifi ed as Category I. It is used for the control
of insects, aphids, saw-fl ies, and spider mites on cereals, fruits, vegetables, and ornamental
plants. On heating, demeton-s-methyl undergoes decomposition and emits very toxic
fumes, phosphorus oxides, and sulfur oxides.
Uses
Different sources of media describe the Uses of 919-86-8 differently. You can refer to the following data:
1. Colinesterase inhibitor. Used as insecticide.
2. Insecticide.
3. Demeton-S-methyl is a systemic insecticide used to control
sucking insects and mites in a wide range of crops and ornamentals.
General Description
Pale yellow oil. Used as an insecticide. Not registered as a pesticide in the U.S.
Reactivity Profile
Organophosphates, such as DEMETON-S-METHYL, are susceptible to formation of highly toxic and flammable phosphine gas in the presence of strong reducing agents such as hydrides. Partial oxidation by oxidizing agents may result in the release of toxic phosphorus oxides.
Health Hazard
Different sources of media describe the Health Hazard of 919-86-8 differently. You can refer to the following data:
1. DEMETON-S-METHYL inhibits the nervous system and is absorbed readily through the skin. DEMETON-S-METHYL is a liquid organophosphorus insecticide. Poisonous; may be fatal if inhaled, swallowed or absorbed through skin. Contact may cause burns to skin and eyes.
2. Demeton-S-methyl is highly toxic to animals and humans. Careless occupational exposures
to demeton-S-methyl cause severe symptoms of poisoning that include, but are not limited
to, headaches, nausea, vomiting, diarrhea, sweating, dizziness, tremors, lack of coordination,
hiccough, and memory loss. Prolonged exposures to high concentrations cause pupillary
constriction, blurred vision, muscle cramp, excessive salivation, weakness, sweating,
abdominal cramps, unconsciousness, respiratory distress, convulsions, respiratory failure,
and death.
3. Highly toxic by all routes of exposure;cholinesterase inhibitor; toxic symptoms similar to those of Demeton and range formheadache, dizziness, blurred vision, and muscle spasms to gastrointestinal effects manifesting vomiting, diarrhea, and abdominalpain, as well as respiratory symptoms ofdyspnea, respiratory depression, and paral-ysis; high exposures may result in onset ofseizures and loss of consciousness; absorbedreadily through skin.LD50 oral (rat): 30–60 mg/kgLD50 oral (guinea pig): 110 mg/kgLD50 skin (rat): 85 mg/kgLC50 inhalation (rat): 500 mg/m3 /4 h.
Fire Hazard
When heated to decomposition, DEMETON-S-METHYL emits very toxic fumes of oxides of phosphorus and sulfur. DEMETON-S-METHYL is a liquid organophosphorus insecticide. DEMETON-S-METHYL may burn but does not ignite readily. Container may explode in heat of fire. Fire may produce irritating or poisonous gases. Runoff from fire control water may give off poisonous gases. Hydrolyzed by alkali.
Safety Profile
Poison by ingestion,
inhalation, sh contact, intraperitoneal, and
intravenous routes. Mutation data reported.
An insecticide. When heated to
decomposition it emits very toxic fumes of
POx and SOx. See also DEMETON-0 +
DEMETON-S and other demeton entries.
Metabolic pathway
The initial step for the biotransformation and photolytic activation of
demeton-S-methyl is by thiooxidation to oxydemeton-methyl; consequently
the metabolism of the two insecticides is very similar and
metabolic routes determined for oxydemeton-methyl should be taken as
applicable to the behaviour of demeton-S-methyl in the same system.
Most studies on the biotransformations of these compounds have used
oxydemeton-methyl.
storage
Demeton-S-methyl should be kept stored separately and away from food and feedstuffs.
Keep in a well-ventilated room.
Degradation
Demeton-S-methyl was hydrolysed rapidly in alkaline media and more
slowly in acidic and neutral media. The half-lives at pH values 4,7 and 9
were 63,56 and 8 days, respectively. It is oxidised to oxydemeton-methyl
(2) (PM).
Precautions
During handling and use of demeton-S-methyl, occupational workers should use a face
shield or eye protection in combination with breathing protection, protective gloves, and
protective clothing. During use and handling of the chemical substance, workers should
not eat, drink, or smoke during work and wash hands before eating. Workers should
prevent generation of chemical mists and observe strict hygiene.
Check Digit Verification of cas no
The CAS Registry Mumber 919-86-8 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,1 and 9 respectively; the second part has 2 digits, 8 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 919-86:
(5*9)+(4*1)+(3*9)+(2*8)+(1*6)=98
98 % 10 = 8
So 919-86-8 is a valid CAS Registry Number.
InChI:InChI=1/C6H15O3PS2/c1-4-11-5-6-12-10(7,8-2)9-3/h4-6H2,1-3H3
919-86-8Relevant articles and documents
Cis-Alkoxyspiro-Substituted Tetramic Acid Derivatives
-
, (2008/06/13)
The invention relates to novel cis-alkoxyspiro-substituted tetramic acid derivatives of the formula (I), in which A, G, X, Y and Z are as defined above, to a plurality of processes and intermediates for their preparation and to their use as pesticides and/or herbicides, and also to selective herbicidal compositions comprising firstly cis-alkoxyspiro-substituted tetramic acid derivatives and secondly a crop plant compatibility-improving compound.
Glyoxyl acid amides, method for producing them and their use for controlling harmful organisms
-
, (2008/06/13)
The invention relates to novel gloyoxylic acid amides, to a process for their preparation and to their use for controlling harmful organisms.
Phenyl-substituted 5,6-dihydrophyne derivatives for use as pesticides and herbicides
-
, (2008/06/13)
The present invention relates to novel phenyl-substituted 5,6-dihydro-pyrone derivatives of the formula (I) in which W, X, Y, Z, G, A, B, Q1 and Q2 are each as defined in the description, to a plurality of processes for their preparation and to their use as pesticides and herbicides.
