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The Stability of a DDT Suspension1

Published online by Cambridge University Press:  10 July 2009

W. B. Hawkins  and
C. W. Kearns
C. W. Kearns
Affiliation:
Professor of Entomology, University of Illinois, Urbana, Illinois.
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Extract

A DDT sol, prepared in glass dishes in the manner described, has a reproducible zeta potential of −25 mv. Electrophoretic measurements showed that DDT conditioned in cardboard cartons has a zeta potential of zero.

The zeta potential of the suspension behaves in a predictable and measurable manner in the presence of mono-, di-, tri-, and tetravalent ions.

Spectrographic analyses showed that there are two identifiable sources of ions: (1) the DDT, and (2) the cardboard container. A third source of ions was indicated as being, singly or together, the distilled water and/or the DDT solvent.

Spectrographic data showed that ions were associated with the conditioned DDT.

In glass containers, a poor source of ions, kill of larvae of Anopheles quadrimaculatus Say was higher than in paper containers, a good source of ions. These data are correlated with the zeta potential and flocculation behaviour of DDT suspensions.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 47 , Issue 2 , July 1956 , pp. 197 - 203
Copyright
Copyright © Cambridge University Press 1957

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References

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