Dimethoate

• O, O- dimethyl S- methylcarbamoylmethyl phosphorodithioate

White solid with an unpleasant odor

Fixed

1.28 g · cm -3 ( at 65 ° C)

52 ° C.

117 ° C (at 10 Pa) ( decomposition above 60 ° C)

1 MPa ( 25 ° C)

Slightly soluble in water (25 g · l-1 at 25 ° C)

Attention

387 mg · kg -1 ( LD50, rat, oral)

Template: Infobox chemical / molecular formula search available

Dimethoate is a chemical compound that is widely used as an insecticide. It belongs to the dithiophosphoric acid esters (also known as alkyl phosphates or ' organic ' phosphates, but not organophosphates ). Insecticides of this group act as contact poisons. Phosphoric acid esters such as other dimethoate inhibits the enzyme cholinesterase, which has an essential function in the nervous system.

History

Dimethoate in 1962 approved for American Cyanamid in the USA.

Chemical Properties

Dimethoate is in a group of Thiophosphoric, more dithiophosphoric. It is relatively stable at room temperature in water and acidic solution, but unstable in alkaline solution. When heated, converts to O, S- Dimethylphosphordithioat.

The substance acts as a potent neurotoxin in numerous organisms, including all insects, and animals, and therefore people. The magnitude of the effect depends on the mass of the individual, as dimethoate distributed in the body. This nerve poison is always dangerous when it reaches the time of shooting a feature- damaging concentration. For treated plants which are intended for human consumption, different long wait are prescribed depending on the culture.

Use

Dimethoate but is used as an insecticide against pests such as aphids, leafhoppers, bugs against houseflies. In addition, it acts as an acaricide and nematicide. The effect is due to inhibition of acetylcholinesterase, the actual active substance ( the oxygen analogue) only produced by metabolism.

The substance is classified harmful due to its nerve-damaging effect than for humans. So may only less than 1 mg / kg occur in previously treated fruits and vegetables. The concentration decreases after the application within days to a harmless level.

To avoid the risk of accidental overdose, the home user, the discharge amount per package unit is limited. Significantly higher packing and concentration units are available for agricultural use.

Occasionally, the impact of dimethoate is discussed on beneficials such as bees or ants. It is classified as hazardous for bees in the group B1 and may not be used on flowering or routes served by bees plants (including weeds). The neurotoxin is in direct contact ( direct spraying, visiting flowers immediately after treatment ) also always harmful when it exceeds the tolerable by each individual lot. Otherwise, it leaves the insect body over time without effective behavioral effects. The contaminating amount of the volatile substance is not introduced by the individual in the state budget. A possible long-term effect on staatendbildende insects is therefore unlikely.

Commercially various dosage forms are readily available, including solutions, aerosol sprays Darreichungen or easily manageable. Far the most common application for individuals is carried out as an aqueous solution for use against " biting and sucking insects ", including aphids. In addition Darreichungen are available that can be used in lower concentrations and in varying combinations against each specific organisms.

Dimethoate is allowed in Germany, Austria and Switzerland as plant protection products.

Trade names

• Perfekthion
• BI58
• ROXION
• Rogor 40 l