Stability of Allethrin and Kerosene Solutions of It in Storage as Demonstrated by Bioassay1

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A sample of allethrin and differently handled portions of a 1% (w/v) solution of it in kerosene (Deobase) were placed in storage and bioassayed several times in a 10-year period by means of toxicity tests against the house fly, Musca domestica L., by the Campbell turntable method. It was demonstrated that the greater and longer the exposure of the solution to light the greater the loss in toxicity. Storage of the solution in the refrigerator at. 4., of no advantage over room temperature in 2 years and only slight advantage in 6 years, was of decided advantage in 10 years with only a 14% Joss compared with a 30% loss in brown glass and 38% in clear glass not in direct sunlight; in clear glass in intermittent sunlight the solution lost nearly all toxicity (96%) in 6 years. Hydroquinone proved to be a good inhibit. or, as did kerosene as a diluent. The undiluted sample of allethrin, stored at 4., showed no loss in nearly 6 years, but 44% in 10 years.

Document Type: Research Article

Publication date: August 1, 1961

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