Terbuthylazine

The terbuthylazine is a active substance of Produit plant health (or Produit phytopharmacological, or Pesticide), which presents an effect Herbicide, and which belongs to the chemical family of the Triazine S.

Regulation

In the field of the regulation of the phytopharmacological produced :

for the European Union: this active substance is in revision for the inscription with appendix I of the Directive 91/414/CEE.
for the France: this active substance is not authorized in the composition of preparations profiting from a marketing authorization:

the use of the terbuthylazine for the Désherbage of the Vigne was prohibited by an opinion with the Official journal of September 26th, 2003, with a time of flow of stocks until December 31st, 2003 for the distribution, and until June 30th, 2004 for the use.
for the other uses, the weedkillers containing terbuthylazine were prohibited with marketing, and were starting from September 30th, 2002 prohibited with the use starting from June 30th, 2003.

Physicochemical characteristics

The physicochemical characteristics whose order of magnitude is indicated hereafter, influence the risks of transfer of this active substance towards water, and risks it pollution the waters:

Hydrolysis with pH 7: very stable,
Solubility: 8,5 mg/l,
Coefficient of division carbon organics-water: 306 cm ³ /g. This parameter, noted Koc, represents the potential of retention of this active substance on the Organic matter of the ground. The mobility of the active matter is reduced by its absorption on the particles of the ground.
Lasted of half-life: 46 days. This parameter, noted DT50, represents the potential of degradation this active substance, and its speed of degradation in the ground.
Coefficient of division octanol-water: 3,2. This parameter, noted Log Kow or Log P, measurement the Hydrophily (low values) or the Lipophilia (strong values) of the active substance.

Ecotoxicology

In the field of the ecotoxicology, the lethal concentrations 50 (CL50) whose order of magnitude is indicated hereafter, is observed:

CL50 on Poisson S: 1,6 mg/l,
CL50 on Daphnid S: 21 mg/l,
CL50 on Alga S: 0,015 mg/l.

Toxicity for the man

In the field of the Toxicity for the Man, the Dose acceptable day laborer (DJA) is about: 0,0022 mg/kg/j.

See too

Substance activates of a phytopharmacological product
Liste of active substances of plant health products
Liste of active substances of phytopharmacological products authorized by the European Union
Liste of active substances of phytopharmacological products prohibited by the European Union

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