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Terbuthylazine
Terbuthylazine is a selective herbicide. Chemically, it is a halogenated triazine; compared with atrazine (1958 inv., Geigy lab) and simazine, it has a tert-butyl group in place of the isopropyl and ethyl group, respectively. The sim-azine molecule with 2 ethyl groups is symmetric and flat (excepting its equal ends). The threefold substituted triazines have resonance of the free (non-bonding, \pi-) electron pairs, resulting in equivalent mesomeric structures.
Simazine remains active in the soil for 2 to 7 months or longer after application. Atrazine remains in soil for a matter of months (although in some soils can persist to at least 4 years) and can migrate from soil to groundwater.
Terbuthylazine's HRAC classification is Group C1, Group C (global, Aus), Group 5 (numeric), as it inhibits photosynthesis at photosystem II.
References
References
- (1994). "Sorption of terbuthylazine and atrazine in relation to the physico-chemical properties of three soils". [[Chemosphere (journal).
- (2018). "Dissipation of terbuthylazine, metolachlor, and mesotrione in soils with contrasting texture". [[J Environ Sci Health B]].
- Atrazine: Chemical Summary. Toxicity and Exposure Assessment for Children's Health (PDF) (Report). U.S. [[United States Environmental Protection Agency. Environmental Protection Agency]]. 2007-04-24. Archived from the original (PDF) on 2012-03-16.
- "Classification of Herbicides According to Site of Action".
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