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Mass spectrum of diazinon


A liquid Insecticide widely used to control fire ants, Silverfish, fleas, ticks, flies, moths, termites, and cockroaches. Diazinon was introduced in 1952. It is an organophosphate type insecticide that works as a cholinesterase inhibitor. Diazinon is used for homes, gardens and pets, but it has harmful effects on birds, bees, and fish.



Chemical structure


Synonyms and Related Terms

O,O-diethyl-O(2-isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate; dimpylate, Dianon®; Diazide®; Diazol®; Neocidal®; Sarolex®; Knox-Out; Spectracide


  • Toxic by ingestion, inhalation and skin absorption.
  • May discolor organic red dyes.

Physical and Chemical Properties

Soluble in petroleum solvents, alcohols and ketones. Slightly soluble in water.

Composition C12H21N2O3PS
CAS 333-41-5
Density 1.116-1.118 g/ml
Molecular Weight mol. wt. = 304.4
Refractive Index 1.4978-1.4981
Boiling Point 83-84 C

Resources and Citations

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry #3043
  • Lynda A. Zycherman, J.Richard Schrock, A Guide to Museum Pest Control, FAIC and Association of Systematics Collections, Washington DC, 1988
  • J. Dawson, CCI Technical Bulletin, 'Solving Museum Insect Problems: Chemical Control' , Canadian Conservation Institute, Ottawa, No. 15
  • Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002
  • Conservation termlist : www.hants.org.uk/museums