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Stability of contact insecticides. III—allethrin, DDT and BHC in ultra-violet light

✍ Scribed by R. E. Blackith

Publisher
John Wiley and Sons
Year
1952
Tongue
English
Weight
528 KB
Volume
3
Category
Article
ISSN
0022-5142

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✦ Synopsis

Abstract

Allethrin, the (±)allylrethronyl ester of (±)trans‐ and (±)cis‐chrysanthemic acids, is more stable to ultra‐violet photolysis than the natural pyrethrins. It is less well protected by benzeneazo‐β‐naphthol, so that the natural and synthetic insecticides have a similar stability in protected films.

DDT decomposes in oil solution at almost the same rate as the pyrethrins when irradiated by ultra‐violet light, and is also protected to a similar extent by benzeneazo‐β‐naphthol. DDT, the pyrethrins, and benzeneazo‐β‐naphthol all absorb ultra‐violet light strongly at about 2200–2400 Å. Some alleged DDT synergists were investigated, but no synergistic effect was detectable with the assay system used.

BHC is stable to ultra‐violet irradiation, as is expected from its formation from an irradiated chlorine‐benzene mixture.

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Stability of contact insecticides. I—ult
Stability of contact insecticides. I—ultra-violet photolysis of the pyrethrins
✍ R. E. Blackith 📂 Article 📅 1952 🏛 John Wiley and Sons 🌐 English ⚖ 545 KB

## Abstract In view of the discrepancy between the stability of pyrethrum‐in‐oil films in direct sunlight and in the dark, the persistence of such films under various conditions is reviewed, and the ultra‐violet photolysis is found to be by far the most active agent in decomposing such films. The a