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Environmental fate & pathways

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N,N,N',N',N''-Pentamethyl-N-C16-18 (even numbered) C18 unsat.-alkyl-1,3-propanediammonium chloride (Diquat C16-18) has a short predicted half-life in air but because there are no important releases into the atmosphere and volatilisation is expected to be negligible, this removal mechanism is thought to be of low relevance. Diquat C16 -18 does not contain hydrolysable covalent bonds. Cleavage of a carbon-nitrogen bond under environmental conditions is only possible with a carbonyl group adjacent to the nitrogen atom. Degradation of diquat C16-18 through hydrolysis is therefore not considered. Direct photolysis of diquat C16 -18 in air/water/soil will not occur, because it does not absorb UV radiation above 290 nm.Photo transformation in air/water/soil is therefore assumed to be negligible.

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