D Allethrin 95%TC Pyrethrin Insecticide

                                                                               D-allethrin

The D-allethrins are a group of related synthetic compounds used in insecticides. They are synthetic pyrethroids, a synthetic form of a chemical found naturally in the chrysanthemum flower. They were first synthesized in the United States by Milton S. Schechter in 1949. Allethrin was the first pyrethroid.

They are commonly used in ultra-low volume sprays for outdoor mosquito control including many household insecticides such as RAID as well as mosquito coils

A D-allethrin-based mosquito repellent coil formulation was used continuously in a room for 30 d.

Two different experiments were conducted and the deposition of residues on different surfaces of the room was determined.

Studies were conducted continuously for a period of 30 d in a fully closed room and in another room kept open for 14 h per day.

The residues deposited on different surfaces, ceiling, side walls and floor, were measured.

The results showed the accumulation of high concentrations of allethrin on all the surfaces of the room

when the room was in a fully closed condition. Samples collected from the ceiling showed residues of

D-allethrin of 6.34-148.63 microg m(-2) during the 30 d study, the side walls 4.68-170.72 microg m(-2) and

the floor 20.00-184.52 microg m(-2) Maximum residues were observed in 30 d samples collected from the ceiling and floor.

The residual concentrations were nearly 10 times higher in samples collected from the closed room.

Discontinuation of the use of the mosquito repellent after 30 d led to a gradual decrease in the concentrations of residues on all the surfaces.

The influence of environmental parameters on the dissipation of residues was also studied.