METHYL PARATHION (ICSC)

METHYL PARATHION	ICSC: 0626

Date of Peer Review: October 2005

O,O-Dimethyl O-4-nitrophenyl phosphorothioate
O,O-Dimethyl-p-nitrophenylthionophosphate
Phosphorothioic acid, O,O-dimethyl O-(4-nitrophenyl) ester

CAS #

298-00-0

C₈H₁₀NO₅PS

RTECS #

TG0175000

Molecular mass: 263.2

UN #

2783

EC Index #

015-035-00-7

TYPES OF HAZARD / EXPOSURE	ACUTE HAZARDS / SYMPTOMS	PREVENTION	FIRST AID / FIRE FIGHTING
FIRE	Combustible. Liquid formulations containing organic solvents may be flammable. Gives off irritating or toxic fumes (or gases) in a fire.	NO open flames.	Water spray, foam, powder, carbon dioxide.
EXPLOSION

EXPOSURE		PREVENT DISPERSION OF DUST! STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN!	IN ALL CASES CONSULT A DOCTOR!
Inhalation	Sweating. Nausea. Vomiting. Dizziness. Pupillary constriction, muscle cramp, excessive salivation. Muscle twitching. Laboured breathing. Diarrhoea. Convulsions. Unconsciousness. Symptoms may be delayed (see Notes).	Local exhaust or breathing protection.	Fresh air, rest. Artificial respiration may be needed. Refer for medical attention.
Skin	MAY BE ABSORBED! (See Inhalation).	Protective gloves. Protective clothing.	Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.
Eyes	Blurred vision.	Face shield or eye protection in combination with breathing protection if powder.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion	(See Inhalation).	Do not eat, drink, or smoke during work. Wash hands before eating.	Induce vomiting (ONLY IN CONSCIOUS PERSONS!). See Notes. Give a slurry of activated charcoal in water to drink. Refer for medical attention immediately.

SPILLAGE DISPOSAL

PACKAGING & LABELLING

Personal protection: chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place.

Do not transport with food and feedstuffs. Severe marine pollutant.
EU Classification
Symbol: T+, N
R: 5-10-24-26/28-48/22-50/53
S: (1/2-)-28-36/37-45-60-61
UN Classification
UN Hazard Class: 6.1
UN Pack Group: II

EMERGENCY RESPONSE

STORAGE

Transport Emergency Card: TEC (R)-61GT7-II

Store in an area without drain or sewer access. Keep in a well-ventilated room. Separated from food and feedstuffs.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities Š IPCS, CEC 2005

SEE IMPORTANT INFORMATION ON BACK

METHYL PARATHION

ICSC: 0626

IMPORTANT DATA

PHYSICAL STATE; APPEARANCE:
COLOURLESS TO WHITE SOLID IN VARIOUS FORMS

CHEMICAL DANGERS:
The substance decomposes on heating producing toxic fumes including nitrogen oxides, phosphorous oxides or sulfur oxides and causing fire and explosion hazard.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 0.2 mg/mł as TWA; (skin); A4 (not classifiable as a human carcinogen); BEI issued; (ACGIH 2005).
MAK not established.

ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion.

INHALATION RISK:
A harmful concentration of airborne particles can be reached quickly on spraying or when dispersed, especially if powdered.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance may cause effects on the nervous system, resulting in convulsions and respiratory depression. Cholinesterase inhibition. Exposure far above the OEL may result in death. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Cholinesterase inhibitor; cumulative effect is possible: see acute hazards/symptoms.

PHYSICAL PROPERTIES

Decomposes below boiling point at 120°C
Melting point: 35-38°C
Density: 1.4 g/cmł
Solubility in water, g/100 ml: 0.006
Vapour pressure, Pa at 20°C: 0.001

Octanol/water partition coefficient as log Pow: 2-3

ENVIRONMENTAL DATA

The substance is very toxic to aquatic organisms. This substance may be hazardous in the environment; special attention should be given to birds and honey bees. This substance does enter the environment under normal use. Great care, however, should be given to avoid any additional release, e.g. through inappropriate disposal.

NOTES

If the pesticide is present in a formulation containing hydrocarbon solvents, vomiting should not be induced. Depending on the degree of exposure, periodic medical examination is suggested. Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available. Carrier solvents used in commercial formulations may change physical and toxicological properties. Do NOT take working clothes home.

ADDITIONAL INFORMATION

LEGAL NOTICE

Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information

Š IPCS, CEC 2005

    See Also:
       Toxicological Abbreviations
       Methyl parathion (EHC 145, 1992)
       Methyl parathion (HSG 75, 1992)
       Methyl Parathion (FAO Meeting Report PL/1965/10/1)
       Methyl Parathion  (IARC Summary & Evaluation, Supplement7, 1987)
       Methyl Parathion (IARC Summary & Evaluation, Volume 30, 1983)