Produit Nom:Metribuzin 48% SC

CAS No.: 21087-64-9

Description: 

Metribuzin

Herbicide

HRAC  C1 WSSA  5; 1,2,4-triazinone

NOMENCLATURE

Common name metribuzin (BSI, E-ISO, WSSA); métribuzine ((f) F-ISO)

IUPAC name 4-amino-6-tert-butyl-4,5-dihydro-3-methylthio-1,2,4-triazin-5-one; 4-amino-6-tert-butyl-3-methylthio-1,2,4-triazin-5(4H)-one 

Chemical Abstracts name 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one 

CAS RN [21087-64-9] 

PHYSICAL CHEMISTRY

Mol. wt. 214.3 

M.f. C8H14N4OS 

Form White crystals, with a weak characteristic odour. 

M.p. 126.2 ºC 

B.p. 132 ºC/2 Pa. 

V.p. 0.058 mPa (20 ºC) 

KOW logP = 1.6 (pH 5.6, 20 ºC) 

Henry 1 ´ 10-5 Pa m3 mol-1 (20 °C, calc.) 

S.g./density 1.28 (20 ºC) 

Solubility

In water 1.05 g/l (20 ºC). In dimethylformamide 1780, cyclohexanone 1000, chloroform 850, acetone 820, methanol 450, dichloromethane 340, benzene 220, n-butanol 150, ethanol 190, toluene 87, xylene 90, isopropanol 77, hexane 1.0 (all in g/l, 20 ºC). 

Stability

Relatively stable to u.v. irradiation. At 20 ºC, stable to dilute acids and alkalis; DT50 (37 ºC) 6.7 h (pH 1.2); DT50 (70 ºC) 569 h (pH 4), 47 d (pH 7), 191 h (pH 9). Photodecomposition in water is very rapid (DT50 <1 d). On soil surfaces under natural light conditions, DT50 14-25 d.   

APPLICATIONS  

Mode of action

Selective systemic herbicide, absorbed predominantly by the roots, but also by the leaves, with translocation acropetally in the xylem. 

Uses

Pre- and post-emergence control of many grasses and broad-leaved weeds in soya beans, potatoes, tomatoes, sugar cane, alfalfa, asparagus, maize and cereals, at 0.07-1.05 kg a.i./ha.  

Selected tradenames:

’Lexone’ ; ’Sencor’ ; ’Mistral’ ;  ’Sencoral’ ; ’Sencorex’ ; ’Citation’ ; ’Feinzin’ ; ’Major’ ; ’Metiroc’ ; ’Pataprop’ ; ’Premercas’ ; ’Qingcaotong’ ; ’Vapcor’ 

Mixtures:

’Artist’ (+ flufenacet) ; ’Axiom AT’ (+ atrazine+ flufenacet); ’Bastille’ (+ flufenacet); ’Canopy’ (+ chlorimuron-ethyl); ’Domain’ (+ flufenacet) ; ’Fedor’ (+ flufenacet) ; ’Galice’ (+ amidosulfuron) ; ’Pilar’ (+ rimsulfuron) ; ’Plateen’ (+ flufenacet) ; ’Preview’ (+ chlorimuron-ethyl) ; ’Salute’ (+ trifluralin); ’Segal’ (+ amidosulfuron)