Hostname: page-component-7bb8b95d7b-fmk2r Total loading time: 0 Render date: 2024-09-06T05:25:41.564Z Has data issue: false hasContentIssue false
  • English
  • Français

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.
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Abbott, W. S. (1925). A method of computing the effectiveness of an insecticide.—J. econ. Ent., 18, pp. 265–267.CrossRefGoogle Scholar
Crowell, R. L. (1940). Insectary rearing of Anopheles quadrimaculatus (a preliminary report).—Amer. J. Hyg., 32, Sect. C pp. 12–20.Google Scholar
Cutkomp, L. K. (1947). Thermal decomposition of DDT dispersed in water.—J. econ. Ent., 40, pp. 444–445.Google Scholar
Krusé, C. W., Ludvik, G. F. & Hawkins, W. B. (1952). Factors affecting evaluation of insecticides against Anopheles larvae.—J. econ. Ent., 45, pp. 598–601.CrossRefGoogle Scholar
Price, C. W. & Lewis, W. C. M. (1933). The electrophoretic behavior of lecithin and certain fats.—Trans. Faraday Soc., 29, pp. 775–787.Google Scholar
Slavin, M. (1938). Quantitative analysis based on spectral energy.—Industr. Engng Chem. (Anal.), 10, pp. 407–411.CrossRefGoogle Scholar
Upholt, W. M. (1947). The inactivation of DDT used in Anopheline mosquito larvicides.—Publ. Hlth Rep., 62, pp. 302–309.CrossRefGoogle ScholarPubMed