Skip to Main content Skip to Navigation
Journal articles

Photolysis of natural β-triketonic herbicides in water.

Abstract : The fate of four natural β-triketones (leptospermone, isoleptospermone, grandiflorone and flavesone, pKa = 4.0–4.5) in aqueous solution, in the dark and upon simulated solar light irradiation was investigated. In anionic form, β-triketones undergo slow dark oxidation and photolysis with polychromatic quantum yields varying from 1.2 × 10−4 to 3.7 × 10−4. Leptospermone and grandiflorone are the most photolabile compounds. In molecular form, β-triketones are rather volatile. Polychromatic quantum yields between 1.2 × 10−3 and 1.8 × 10−3 could be measured for leptospermone and grandiflorone. They are 3–5 times higher than for the anionic forms. Photooxidation on the carbon atom bearing the acidic hydrogen atom is the main oxidation reaction, common to all the β-triketones whatever their ionization state. However, leptospermone shows a special photoreactivity. In molecular form, it mainly undergoes photoisomerization. Based on this work, the half-lives of β-triketones in surface waters should be comprised between 7 and 23 days.
Document type :
Journal articles
Complete list of metadatas

https://hal.archives-ouvertes.fr/hal-01202512
Contributor : Stéphanie Bonnefoy <>
Submitted on : Monday, September 21, 2015 - 11:29:58 AM
Last modification on : Friday, September 18, 2020 - 2:34:13 PM

Identifiers

Citation

Aurélien Trivella, Malgorzata Stawinoga, Franck E. Dayan, Charles L. Cantrell, Patrick Mazellier, et al.. Photolysis of natural β-triketonic herbicides in water.. Water Research, IWA Publishing, 2015, 78, pp.28-36. ⟨10.1016/j.watres.2015.03.026⟩. ⟨hal-01202512⟩

Share

Metrics