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Problems concerning the Efficiency of Oils as Mosquito Larvicides.—II. The spreading Power of Oils and Methods of increasing it

Published online by Cambridge University Press:  10 July 2009

David R. P. Murray
David R. P. Murray
Affiliation:
From the Department of Entomology, London School of Hygiene and Tropical Medicine.
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Extract

1. A method is described of using the Adam-Langmuir surface pressure trough for the direct measurement of the spreading power of oils against surface contamination.

2. Pure higher paraffins are non-spreading and pure aromatics have only a small spreading pressure. Commercial grades of oils owe what spreading pressure they have to impurities which are only present in small quantities and can be removed.

3. The spreading power of oil is greatly increased by irradiation of very thin layers of the oil. Even so, only a small fraction undergoes chemical change, the great bulk being recoverable with its original properties.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 30 , Issue 2 , July 1939 , pp. 211 - 236
Copyright
Copyright © Cambridge University Press 1939

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