Simazine

• 6-chloro- N, N'- diethyl- 1 ,3,5-triazine -2 ,4 -diamine
• Gesatop

White to beige powder

Fixed

1.30 g · cm -3

225-227 ° C ( decomposition)

0.81 uPA (20 ° C)

In water 6.2 mg · l-1

Attention

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Simazine (6- chloro-N, N'- diethyl- 1 ,3,5-triazine -2 ,4 -diamine ) is a developed Geigy, selective and systemically acting herbicide. It is as atrazine and terbuthylazine to the chlorotriazines.

The herbicide is sold under the trade names among others, simazine, Gesatop Quick, Linocin, Meduron, Topuron and Trevox.

History

Simazine was developed in the 1950s by the Geigy AG and 1957 first placed on the market. Economically, simazine a great success. The Agricultural Division of Geigy belongs to a series of mergers today to Syngenta. Since simazine residues in drinking water were becoming more of a problem, the EU regulator in 2003 decided to register simazine not return as pesticide.

Use

Simazine has been, or is used in agriculture as a selectively acting herbicide against grasses and broadleaf weeds. It has been used most often in the cultivation of corn. In addition, it is suitable as a herbicide in crops deep -rooting plants. On non- agricultural land, it also served as a broad-spectrum herbicide.

Simazine is no longer allowed in Germany since 2000, also in Austria is no longer approved. In Switzerland, simazine can be used as a herbicide in the cultivation of corn, asparagus, wine, ornamental shrubs, berry and pome fruit, the grants were but now revoked.

Toxicology

The toxicity of simazine is low, the LD50 for oral ingestion is indicated for rat, mouse, rabbit, chicken and pigeon with more than 5 g / kg body weight. For all feeding studies a lowest NOEL of 0.6 mg / kg body weight was found. Simazine in rats resulted in tumors in the mammary glands, and kidneys, after a permitted daily dose of 0.005 mg / kg body weight was determined. Ingested simazine is rapidly absorbed. Within the first day, 65-97 % of which are excreted, mostly already metabolized.

Environmental impact

Simazine is absorbed to soil minerals, because of its low water solubility, the Auswaschungsrate is low. The degradation is mainly caused by bacteria. For fish simazine is toxic, the lethal concentration in water ( LC50 ( 96 h) ) is for rainbow trout and carp at 100 mg / l Simazine is not toxic to bees.