Review of Atrazine - Chemistry Assessment

Section 3, November 1997

1. Active Constituent

1.1 Chemical Identity

Common name: atrazine
Chemical name: IUPAC: 2 chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine
Chem. Abs: 2-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazin-4,6-diamine
CAS no: 1912-24-9
Code no: Ciba-Geigy G 30027
Structural formula: Atrazine Structural formula
Empirical formula: C8H14ClN5
Molecular weight:


1.2 Chemical & physical properties - pure active constituent

Appearance: white powder, colourless crystalline solid
Odour: slight, non-specific, odourless
Melting point: 175-177°C
Octanol/water Kow:  398
partition coeff: log P: 2.5 log Kow: 2.6
Density: 1.19 g/cm3 at 20oC
1.187 g/cm3 at 20oC
1.23 g/cm3 at 22oC
Vapour pressure: 5.7 x 10-8 mmHg at 10oC
3.0 x 10-7 mm Hg (4 x 10-5 Pa) at 20oC
3.0 x 10-7 mmHg at 20oC
1.4 x 10-6 mm Hg (1.9 x 10-4 Pa) at 30oC
1.4 x 10-6 mmHg at 30oC
6.0 x 10-6 mm Hg (8.0 x 10-4 Pa) at 40oC
2.3 X 10-5 mmHg at 50oC
pKa: 1.6 (very weak base) pK = 1.64 at 20oC
Solubility: 30 ppm in water (20oC) 30 ppm at 20oC
33 mg/L at 22oC
chloroform 52000 ppm
diethyl ether 12000 ppm
ethyl acetate 24000 ppm
n-octanol 8700 ppm
methanol 15000 ppm
acetone 31000 ppm
toluene 4000 ppm
n-hexane 110000 ppm
dichloromethane 28000 ppm
Vapour Pressure: 3.85 x 10-5 Pa at 25oC

1.3 Chemistry aspects

The chemistry aspects (manufacturing process, quality control procedures, batch analysis results and analytical methods) of the atrazine TGAC's have been evaluated and continue to meet current standards.

2. Formulation of End Use Products

3. Declaration of Composition

Atrazine TGAC's contain a minimum of 92-95% atrazine and a minimum of 98% active triazines (includes the symmetrical triazines simazine and propazine). Impurities include dichlorotriazines, tris(alkylamino)triazines and hydroxy-triazines.

See Attachments 2-1 to 2-6 for Declarations of Composition and Batch Analyses for currently-approved sources of TGAC atrazine.


The following attachments contain commercial-in-confidence material and have been removed.

1-1 to 1-30 End use product details

2-1 to 2-6 Declarations of composition and batch analyses

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