Chlorpyrifos (CPS), sold under many brand names, is an organophosphate pesticide used to kill a number of pests including insects and worms.wikipedia
175 Related Articles

Dow Chemical Company

DowDow ChemicalThe Dow Chemical Company
It was introduced in 1965 by Dow Chemical Company.
It produces agricultural chemicals including the pesticide Lorsban and consumer products including Styrofoam.


organophosphatesphosphate esterorganophosphate pesticide
Chlorpyrifos (CPS), sold under many brand names, is an organophosphate pesticide used to kill a number of pests including insects and worms.

Acetylcholinesterase inhibitor

cholinesterase inhibitoranticholinesterasecholinesterase inhibitors
It acts on the nervous system of insects by inhibiting acetylcholinesterase.

Pesticide residue

pesticide residuespesticide contaminationresidue
Risk assessments have primarily considered acute exposure, but more recently researchers have begun to investigate the effects of chronic, low-level exposure through residue in pollen and components of bee hives.

Scott Pruitt

On March 29, 2017, EPA Administrator Scott Pruitt denied a petition to ban chlorpyrifos.
Chlorpyrifos is a pesticide that is used to kill a number of pests on crops, animals, and in buildings.


Sierra Club Legal Defense FundEarth JusticeSierra Legal Defence Fund
In contrast, Marisa Ordonia, a lawyer for Earthjustice, the organization that had conducted much of the legal work on the case, hailed the decision.
In 2017, the Ninth Circuit Court of Appeals rejected a suit against the EPA with the goal of banning the pesticide Chlorpyrifos.

Reference dose

acceptable daily dose
The EPA’s acceptable daily dose is 0.3 micrograms/kg/day.
As an example, consider the following determination of the RfD for the insecticide chlorpyrifos, adapted from the EPA's Interim Reregistration Eligibility Decision for chlorpyrifos.

River Kennet

KennetKennet ValleyUpper Kennet Valley
In Britain, the rivers Roding (1985), Ouse (2001), Wey (2002 & 2003), and Kennet (2013) all experienced insect, shrimp, and/or fish kills as a result of small releases of concentrated chlorpyrifos.
In July 2013 the Environment Agency investigated an insect kill which resulted when a small quantity (estimated to be two teaspoonfuls (10 millilitres)), of chlorpyrifos, an organophosphate insecticide used in ant poison and available in garden centres, was flushed into the river killing the freshwater shrimp and most other arthropods on the stretch of the river between Marlborough and Hungerford.

Organophosphate poisoning

organophosphate toxicityintoxication
*Organophosphate poisoning
Insecticides including malathion, parathion, diazinon, fenthion, dichlorvos, chlorpyrifos, ethion, trichlorfon


Chlorpyrifos is produced via a multistep synthesis from 3-methylpyridine, eventually reacting 3,5,6-trichloro-2-pyridinol with diethylthiophosphoryl chloride.
3-Picoline is a useful precursor to agrochemicals, such as chlorpyrifos.

Kalabhavan Mani

On 18 March 2016, based on the forensic test from the Regional Chemical Examiner’s Laboratory, death cause was identified with high probability a highly poisonous chemical, Chlorpyrifos—usually used in insecticides, which is banned in many countries for residential use, it is considered as a hazardous substance for general ecology.

Fine chemical

fine chemicalsspecialty chemicalSpecialty chemicals
Pyridine derivatives are found in both well-known Diquat and Chlorpyrifos herbicides, and in modern nicotinoid insecticides, such as Imidacloprid.

Jack Thrasher

His area of expertise was primarily the toxicity of formaldehyde, as well as chlorpyrifos, and he has acted as an expert witness and consultant since 1984.


Chlorethoxyfos has a O-alkyl phosphorothioate type of phosphorus group which makes it similar to compounds such as chlorpyriphos-methyl, coumaphos, diazinon, dichlofenthion, fenitrothion, fenthion, parathion, parathion-methyl, pyrazophos, pyrimiphos-methyl, sulfotep, temephos, and thionazin.

Cupriavidus nantongensis

C. nantongensis
Cupriavidus nantongensis is a Gram-negative, chlorpyrifos-degrading and aerobic bacterium from the genus of Cupriavidus which has been isolated from sludge from Nantong in China.


bed bugbedbugbedbugs
Professional pest control experts may use potentially harmful substances such as chlorpyrifos.

Aluminium phosphide poisoning

Several incidents of death in travelers in Thailand and other parts of Southeast Asia may have been caused by aluminum phosphide or chlorpyrifos, an organophosphate insecticide, used in an attempt to kill bedbugs in hotels.

Metisa plana

Chemicals such as trichlorfon and chlorpyrifos, cypermethrin and lambda-cyhalothrin can be applied as soil drenches.


TCPy or 3,5,6-trichloro-2-pyridinol is a metabolite of chlorpyrifos and chlorpyrifos-methyl, both organophosphate insecticides.

Attention deficit hyperactivity disorder

ADHDattention deficit disorderhyperactivity
Exposure to the organophosphate insecticides chlorpyrifos and dialkyl phosphate is associated with an increased risk; however, the evidence is not conclusive.

Bed bug control techniques

eradicating bed bugsbed bug eradicationexterminator
Up until the 1990s chlorpyrifos was used as an agent with longterm effect, but the EC biocide declaration 98/8 prohibited the use from August 2008 onward.

Michael Dourson

Dourson's organization TERA has studied many substances whose use has been the matter of public debate, including chlorpyrifos (a pesticide), diacetyl (a food additive), ammonium perchlorate (a rocket fuel), 1-bromopropane (an industrial solvent), and perfluorooctanoic acid (PFOA) (a plastics production chemical).

Jack jumper ant

Jack jumpersM. pilosula
Chemicals like bendiocarb, chlorpyrifos, diazinon and permethrin are effective against them.