Methidathion

Acute toxicity - Category 2, Oral

Acute toxicity - Category 4, Dermal

Hazardous to the aquatic environment, short-term (Acute) - Category Acute 1

Hazardous to the aquatic environment, long-term (Chronic) - Category Chronic 1

H318 Causes serious eye damage

H410 Very toxic to aquatic life with long lasting effects

P260 Do not breathe dust/fume/gas/mist/vapours/spray.

P264 Wash hands thoroughly after handling.

P264 Wash skin thouroughly after handling.

P273 Avoid release to the environment.

P280 Wear protective gloves/protective clothing/eye protection/face protection.

P284 Wear respiratory protection.

P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.

P264 Wash ... thoroughly after handling.

P270 Do not eat, drink or smoke when using this product.

P280 Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/...

P273 Avoid release to the environment.

P301+P316 IF SWALLOWED: Get emergency medical help immediately.

P321 Specific treatment (see ... on this label).

P330 Rinse mouth.

P302+P352 IF ON SKIN: Wash with plenty of water/...

P317 Get medical help.

P362+P364 Take off contaminated clothing and wash it before reuse.

P391 Collect spillage.

P405 Store locked up.

P501 Dispose of contents/container to an appropriate treatment and disposal facility in accordance with applicable laws and regulations, and product characteristics at time of disposal.

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Fresh air, rest. Artificial respiration may be needed. Refer immediately for medical attention.

Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer immediately for medical attention. Wear protective gloves when administering first aid.

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

Rinse mouth. Give a slurry of activated charcoal in water to drink. Refer immediately for medical attention.

This material is poisonous to humans. Its toxic effects are by action on the nervous system. Human volunteers ingesting 0.11 mg/kg/day for 6 weeks had no clinical effects. (EPA, 1998)

Airway protection. Insure that a clear airway exists. Intubate the patients and aspirate the secretions with a large-bore suction device if necessary. Administer oxygen by mechanically assisted pulmonary ventilation if respiration is depressed. Improve tissue oxygenation as much as possible before administering atropine, so as to minimize the risk of ventricular fibrillation. In severe poisonings, it may be necessary to support pulmonary ventilation mechanically for several days. Organophosphate pesticides

Self contained breathing apparatus with a full facepiece operated in pressure demand, or other positive pressure mode /should be used in firefighting/. Parathion

Non-Specific -- Organophosphorus Pesticide, n.o.s.) 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. (EPA, 1998)

Use water spray. Use dry powder. Use carbon dioxide.

Personal protection: complete protective clothing including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Sweep spilled substance into covered sealable containers. Carefully collect remainder. Then store and dispose of according to local regulations.

Personal protection: complete protective clothing including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Sweep spilled substance into covered sealable containers. Carefully collect remainder. Then store and dispose of according to local regulations.

Ventilate area of spill or leak. collect for reclamation, or absorb in vermiculite, dry sand, earth, or a similar material. parathion

NO open flames. Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.

Provision to contain effluent from fire extinguishing. Separated from food and feedstuffs. Well closed. Store in an area without drain or sewer access.Store in dry, well-ventilated, secure area out of reach of children and animals.

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Ensure adequate ventilation. Handle in accordance with good industrial hygiene and safety practice. Set up emergency exits and the risk-elimination area.

Wear face shield or eye protection in combination with breathing protection.

Protective gloves. Protective clothing.

Use local exhaust or breathing protection.

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Decomposes on heating. This produces toxic fumes.

Relatively stable to hydrolysis in neutral, or slightly acidic media, less stable in more acidic (pH 1), or in alkaline media (pH 13, 50% loss in 30 min @ 25 deg C).

Organophosphates, such as METHIDATHION, 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.

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no data available

When heated to decomposition it emits very toxic fumes of /oxides of nitrogen, oxides of phosphorous and oxides of sulfur/.

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Cancer Classification: Group C Possible Human Carcinogen

no data available

Cholinesterase inhibition. The substance may cause effects on the nervous system. This may result in convulsions and respiratory depression. Exposure could cause death. The effects may be delayed. Medical observation is indicated.

Cholinesterase inhibition. Cumulative effects are possible. See Acute Hazards/Symptoms.

A harmful concentration of airborne particles can be reached quickly when dispersed.

AEROBIC: A half-life in aerobic soil of 11 days has been reported(1). Methidathion, at a concentration of 4 mg, containing chain labeled C14 was added to 400 cu cm of 4 different soils and incubated at 25 deg C(2). After 16 weeks, 7% C14, 8% C14, 1% C14, and 2% C14 remained in Puyallop sandy loam, Sultan silt loam, Chehalis clay loam, and organic soil, respectively(2). After 16 weeks, 49-60% methidathion remained in fumigated controls with <3% of the radioactivity was expired as CO2(2). An avg half-life of 12.42 days was measured for 1-50 ug/L methidathion added to filtered water collected during May-April, 1997 from the Limon River, between Mara and Paez, State of Zula, Argentina(3).

Whole-body BCFs of 3.0, 2.2, 1.5, and 2.6 were measured using carp (Cyprino carpio L.) after 24, 72, 120, and 196 hr exposure to 2.6 ug/L methidathion, respectively(1). Average BCFs after 168 hr exposures were 6.4, 5.6, 4.6, 3.6, and 5.5 for guppy (female) (Lebistes reticulatus), guppy (male), killifish (Oryzias latipes), goldfish (Carassius aurapus), and cloud mountain fish (Tanichthys albonubes), respectively(2). According to a classification scheme(3), these BCF values suggest bioconcentration in aquatic organisms is low(SRC). Tests using the Mediterranean mussel, Mytillus galloprovincialis, resulted in a BCF value of 193(4).

Experimental Koc values of 34(1) and 761(2) in soil have been reported. According to a classification scheme(3), these Koc values suggest that methidathion is expected to have very high to low mobility in soil(SRC). Experimental Koc values of 7 and 56 were determined in 2 different pond sediments at pH 5.9 and 6.5, respectively(4). Methidathion was shown to have no to moderate leaching potential using agricultural soils characterized by high organic content from the Canary Island of Tenerife(5).

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The material can be disposed of by removal to a licensed chemical destruction plant or by controlled incineration with flue gas scrubbing. Do not contaminate water, foodstuffs, feed or seed by storage or disposal. Do not discharge to sewer systems.

Containers can be triply rinsed (or equivalent) and offered for recycling or reconditioning. Alternatively, the packaging can be punctured to make it unusable for other purposes and then be disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is possible for combustible packaging materials.

ADR/RID: UN2783 (For reference only, please check.)

IMDG: UN2783 (For reference only, please check.)

IATA: UN2783 (For reference only, please check.)

ADR/RID: ORGANOPHOSPHORUS PESTICIDE, SOLID, TOXIC (For reference only, please check.)

IMDG: ORGANOPHOSPHORUS PESTICIDE, SOLID, TOXIC (For reference only, please check.)

IATA: ORGANOPHOSPHORUS PESTICIDE, SOLID, TOXIC (For reference only, please check.)

ADR/RID: 6.1 (For reference only, please check.)

IMDG: 6.1 (For reference only, please check.)

IATA: 6.1 (For reference only, please check.)

ADR/RID: I (For reference only, please check.)

IMDG: I (For reference only, please check.)

IATA: I (For reference only, please check.)

ADR/RID: Yes

IMDG: Yes

IATA: Yes

no data available

no data available

Carrier solvents used in commercial formulations may change physical and toxicological properties.Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available.Do NOT take working clothes home.