Jump to navigation Jump to search
Mass spectrum of chlorpyrifos


[Dow AgroSciences] A brand name for an Insecticide containing Chlorpyrifos, an organophosphate. Dursban is widely used for control of cockroaches, chinch bugs, spiders, mosquitos, and ticks. It has some residual activity.



Chemical structure


Synonyms and Related Terms

chlorpyrifos; o,o-diethyl o-(3,5,6-trichloro-2-pyridyl) phosphorothioate; organophosphate; Lorsban; Pyrinex; ENT-27311; Dowco 179


  • Toxic by inhalation, ingestion, and skin contact.
  • Corrosive to copper and brass.
  • Discolors red dyes.
  • May leave deposits on nearby surfaces.
  • Combustible. Flash point = 115 C Decomposes at 130 C
  • Dow AgroSciences: SDS

Physical and Chemical Properties

  • Emuslifiable in water.
  • pH = 4.52 in a 10% solution.
  • Soluble in most organic solvents.
Composition C9H11Cl3NO3PS
CAS 2921-88-2
Melting Point 41-42 C
Density 1.027 g/ml
Molecular Weight mol. wt. = 35.39

Resources and Citations

  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 2242
  • Lynda A. Zycherman, J.Richard Schrock, A Guide to Museum Pest Control, FAIC and Association of Systematics Collections, Washington DC, 1988