PAN Pesticides Database - Chemicals

Methamidophos - Identification, toxicity, use, water pollution potential, ecological toxicity and regulatory information

Note: See Working with the Information on this Page section below for important notes about this data.

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Identifying information, including synonyms, ID numbers, use type, chemical classification, a link to a list of all products containing this chemical and a list of the top crops this pesticide is used on in California.
Signs and symptoms of poisoning, first aid, and links to treatment information for this chemical.
Link to information on toxicity to humans, including carcinogenicity, reproductive and developmental toxicity, neurotoxicity, and acute toxicity.
Links to world-wide registration status as well as regulatory information for the U.S. and California.
Water quality standards and physical properties affecting water contamination potential.
Toxicity to aquatic organisms.
List of chemicals in the same family, including breakdown products, salts, esters, isomers, and other derivatives.
 

Chemical Identification and Use for Methamidophos

Basic Identification Information About This Chemical
Chemical Name: Methamidophos
CAS Number: 10265-92-6
U.S. EPA PC Code: 101201
CA DPR Chem Code: 1697
Molecular Weight: 141.1
Molecular Structure:
Use Type: Breakdown product , Insecticide
Chem Class: Organophosphorus
View Related Chemicals
 
Additional Resources About This Chemical Class and Use Type
Historical Use of this Chemical
Top five crops and sites for this pesticide in California
Structural Pest Control  
View All Crops and Sites
 
Other Names for this Chemical
About Chemical Synonyms
(US EPA PC Code ) , 101201 (US EPA PC Code Text ) , 10265-92-6 (CAS number) , 10265926 , 10265926 (CAS number without hyphens) , 1697 (CA DPR Chem Code) ) , 170 (PDP Code) , Acephate breakdown product , Acephate-met , Amidophos , Bay 71628 , ENT 27396 , Filitox , Metamidofos , Metamidofos Estrella , Metamidofosz , Metamidophos , Methamidofos , Methamidophos , Methamidophos (ANSI) , METHAMIDOPHOS (CA DPR Chem Code Text ) , Methamidophos (Monitor) , Methamidophos (Soluble liquid formulations of the substance that exceed 600 g active ingredient/l) , Monitor , MTD , MTD 600 , O,S-Dimethyl phosphoramidothioate , Ortho 9006 , Patrole , Phosphoramidothioic acid, O,S-Dimethyl ester , Pillaron , RE-9006 , SRA 5172 , Tahmabon , Tamanox , Tamaron
 
Products Containing This Chemical
Current and historic U.S. registered products
View U.S. Products All Products Currently Registered Products
 

Signs and Symptoms of Methamidophos Poisoning

NOTE! There may be other diseases and chemicals that have similar symptoms.

If you have a poisoning emergency in the United States call 1-800-222-1222.
If the victim has collapsed or is unconscious, call 911.

Methamidophos is a Organophosphorus compound.

Report a Poisoning

Symptoms of Poisoning with Organophosphorus Compounds
Find Products Containing this Chemical

- Excessive salivation, sweating, rhinorrhea and tearing.
- Muscle twitching, weakness, tremor, incoordination.
- Headache, dizziness, nausea, vomiting, abdominal cramps, diarrhea.
- Respiratory depression, tightness in chest, wheezing, productive cough, fluid in lungs.
- Pin-point pupils, sometimes with blurred or dark vision.
- Severe cases: seizures, incontinence, respiratory depression, loss of consciousness.
- Cholinesterase inhibition.

Source for Group Symptoms: Recognition and Management of Pesticide Poisoning, 5th edition, U.S. EPA, Chapter 4.

Treatment for Organophosphorus Poisoning

See: Recognition and Management of Pesticide Poisoning, 5th edition, U.S. EPA, Chapter 4, page 40.

 
Symptoms of Methamidophos Exposure from the International Chemical Safety Cards (ICSC)

Report a Poisoning

View full ICSC Cards: English   Español   Française   Chinese   Dutch   Finnish   German   Hungarian   Japanese   Swahili   Thai   Urdu  
NOTE! PREVENT DISPERSION OF DUST! STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN!

Route of Exposure

Symptoms

First Aid

Inhalation Dizziness. Sweating. Laboured breathing. Unconsciousness. Weakness. Pupillary constriction muscle cramp excessive salivation. (See Ingestion). Fresh air rest. Half-upright position. Refer for medical attention. See Notes.
Skin MAY BE ABSORBED! (Further see Inhalation). Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention. (See Notes).
Eyes Redness. Pain. Blurred vision. First rinse with plenty of water for several minutes (remove contact lenses if easily possible) then take to a doctor.
Ingestion Abdominal cramps. Convulsions. Diarrhoea. Nausea. Vomiting. Muscle twitching. (Further see Inhalation). Rinse mouth. Give a slurry of activated charcoal in water to drink. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Rest. Refer for medical attention. See Notes.
Notes for ICSC Information
Use of alcoholic beverages enhances the harmful effect. Depending on the degree of exposure periodic medical examination is indicated. Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available. If the substance is formulated with solvent(s) also consult the card(s) (ICSC) of the solvent(s). Carrier solvents used in commercial formulations may change physical and toxicological properties. Do NOT take working clothes home. Bay 71628 Monitor Pillaron SRA 5172 and Tamaron are trade names. If the substance is present under the form of a formulation containing hydrocarbon solvents vomiting may not be induced.
 

Toxicity Information for Methamidophos

  Note: Information for many chemicals is incomplete and may not be fully representative of effects on humans. Why?

Summary Toxicity Information

PAN Bad Actor
Chemical
1
Acute
Toxicity
2
Carcinogen Cholinesterase
Inhibitor
Ground
Water Contaminant
Developmental or
Reproductive Toxin
Endocrine
Disruptor
Not Likely
Potential
 
Indicates high toxicity in the given toxicological category. Indicates no available weight-of-the-evidence summary assessment. For additional information on toxicity from scientific journals or registration documents, see the "Additional Resources for Toxicity " section of the chemical detail page.
1. PAN Bad Actors are chemicals that are one or more of the following: highly acutely toxic, cholinesterase inhibitor, known/probable carcinogen, known groundwater pollutant or known reproductive or developmental toxicant. NOTE! Because there are no authoritative lists of Endocrine Disrupting (ED) chemicals, EDs are not yet considered PAN Bad Actor chemicals.
2. The acute toxicity reported on this page is of the pure chemical ingredient only and may not reflect the acute toxicity of individual pesticide products. To view acute toxicity of individual products, click on 'View Products' link in the 'Chemical Identification' section above.

Detailed Toxicity Information

This Chemical
Parent Chemical 
Acute Toxicity 2
Methamidophos Acephate
WHO Acute Hazard
TRI Acute Hazard
Material Safety Data Sheets
Acute rating from U.S. EPA product label
U.S. NTP Acute Toxicity Studies
      View Studies
Cholinesterase Inhibitor
Ib, Highly Hazardous
Not Listed
Not Available
No Consensus Value
No NTP Studies

Yes
III, Slightly Hazardous
Not Listed
Not Available
Slightly Toxic
No NTP Studies

Yes
2. The acute toxicity reported on this page is of the pure chemical ingredient only and may not reflect the acute toxicity of individual pesticide products. To view acute toxicity of individual products, click on 'View Products' link in the 'Chemical Identification' section above.
 
Cancer Information
Methamidophos Acephate
IARC Carcinogens
U.S. NTP Carcinogens
California Prop 65 Known Carcinogens
U.S. EPA Carcinogens
TRI Carcinogen
Not Listed
Not Listed
Not Listed
Not Likely
Not Listed
Not Listed
Not Listed
Not Listed
C, Possible
Not Listed
 
Endocrine Disruption
Methamidophos Acephate
Illinois EPA list
Keith list
Colborn list
Benbrook list
Danish Inert list
EU list
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Not listed
Not listed
Not listed
Not listed
Not listed
Yes
 
Reproductive and Developmental Toxicity
Methamidophos Acephate
CA Prop 65 Developmental Toxin
U.S. TRI Developmental Toxin
CA Prop 65 Female Reproductive Toxin
CA Prop 65 Male Reproductive Toxin
U.S. TRI Reproductive Toxin
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
 
Chemicals of Special Concern
Methamidophos Acephate
PAN Bad Actors
PAN Dirty Dozen list
Yes
Yes
Not Listed
 

Water Pollution Potential and Criteria for Methamidophos

Water Pollution Potential

This Chemical
Parent Chemical
  Methamidophos Acephate
PAN Ground Water Contaminant Rating Potential Potential
 
Physical Property Data Related to Water Contamination Potential
Water Solubility (Avg, mg/L)
Adsorption Coefficient (Koc)
Hydrolysis Half-life (Avg, Days)
Aerobic Soil Half-life (Avg, Days)
Anaerobic Soil Half-life (Avg, Days)
1,200,000
8.00
21.0
1.00
-
 
 

Water Standards and Criteria

This Chemical
Parent Chemical
WHO Water Quality Criteria
Description Unlikely to occur in drinking-water
Notes Notes: e
 

Regulatory Information for Methamidophos

International Regulatory Status

This Chemical
Parent Chemical 
 
UNEP Persistent Organic Pollutant (POP)
UNEP Prior Informed Consent Chemical (PIC)
WHO Obsolete Pesticide

Yes
Not Listed
Not Listed
Not Listed
Not Listed
 

U.S. and California Regulatory Status

U.S. EPA Registered
U.S. EPA Hazardous Air Pollutant
U.S. EPA Minimum Risk Pesticide (25b list)

CA Registered
CA Groundwater Contaminant
CA Toxic Air Contaminant
No
Not Listed
No

No
Not Listed
In Evaluation
Yes
Not Listed
No

Yes
Potential
In Evaluation
 

Maximum Tolerance and Residue Levels

Codex Alimentarius
   (UN FAO Maximum Residue Limits)
U.S. Maximum Tolerance Levels
European Union Maximum Residue Levels
Go to web site

Go to web site

Go to web site
 

Ecotoxicity for Methamidophos

Note! Information for many chemicals is incomplete and may not be fully representative of effects on the environment. Why? Click on underlined terms for definitions and additional information.

Aquatic Ecotoxicity

All Toxic Effects for Organism Group
Organism Group Effects Noted
Amphibians Mortality
Crustaceans Behavior, Enzyme(s), Feeding Behavior, Mortality
Fish Enzyme(s), Feeding Behavior, Growth, Mortality
Molluscs Intoxication
Zooplankton Intoxication, Mortality
View All Aquatic Ecotoxicity Studies and References
 
Summary of Acute Toxicity for Organism Group
Organism Group Average Acute Toxicity Acute Toxicity Range
Amphibians Slightly Toxic Slight Toxicity
Crustaceans Highly Toxic Moderate to Very High Toxicity
Fish Slightly Toxic Slight to Moderate Toxicity
Zooplankton Highly Toxic Moderate to High Toxicity
View All Acute Summaries
 

Terrestrial Ecotoxicity

Summary of Acute Toxicity for Organism Group
Organism Group Average Acute Toxicity Acute Toxicity Range
HoneybeesHighly ToxicHighly Toxic
Note: Population-level effects on honeybees may occur even if a pesticide has low acute toxicity. For example, certain pesticides interfere with honeybee reproduction, ability to navigate, or temperature regulation, any of which can have an effect on long-term survival of honeybee colonies. The neonicotinoids, pyrethroids and keto-enol pesticides are some types of pesticides causing one or more of these effects.
Honeybee Chronic Toxicity

Sorry, no honeybee chronic toxicity data available for this chemical. Try related chemicals.

Related Chemicals for Methamidophos

CAS Number Relation Reason Chemical Name Chem Detail Symptoms California Use Chem Use Type U.S. EPA Reg PAN Bad Actor
30560-19-1 Parent P Acephate View View View Insecticide Yes Yes
10265-92-6 Related 5a Methamidophos View View View Insecticide, Breakdown product No Yes
 
Working with the Information on this Page

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* Data marked with an asterisk indicates that this chemical is not explicitly listed on the corresponding list. Instead, it belongs to a group of chemicals that IS designated on the list. For example, if an agency assigns a classification of reproductive toxicant to "mercury compounds", that classification is applied to all mercury compounds in the PAN Pesticide database, which are then marked with an asterisk.

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