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Colorless crystals used as an Herbicide. Picloram is a translocated herbicide that is applied to the soil to kill the plant and its roots. It is chemically stable and remains in the environment for years before decomposing.

Synonyms and Related Terms

4-Amino-3,5,6-trichloropicolinic acid; Tordon [Dow Chemical]; Amdon; ATCLP; Borolin; K-PIN; Chloramp; Grazon; Uniran [Ciba Geigy]


  • Ingestion, inhalation and skin absorption cause severe irritation and burning.
  • LD50 = 8200 mg/kg
  • Combustible.
  • Environmental hazard.
  • Toxic to aquatic systems.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in acetone. Slightly soluble in water, dichloromethane.

Composition C6H3Cl3N2O2
CAS 1918-02-1
Melting Point 218-219 C (dec)
Molecular Weight mol. wt. = 241.5

Resources and Citations

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7280
  • G.Caneva, M.P.Nugari, O.Salvadori, Biology in the Conservation of Works of Art, ICCROM, Rome, 1991

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