HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Jarroll, E. L. Articles by Meyer, E. A. Search for Related Content PubMed PubMed Citation Articles by Jarroll, E. L., Jr. Articles by Meyer, E. A.

Giardia Cyst Destruction: Effectiveness of Six Small-Quantity Water Disinfection Methods

None of the available chemical methods for disinfecting drinking water has ever been tested for its ability to destroy Giardia cysts. We tested the ability of six such methods to act against Giardia, using excystation as the criterion of viability. Two water qualities (cloudy and clear) and two temperatures (3 and 20°C) were tested. At 20°C, using cloudy and clear water, all of the methods proved completely effective. However, at 3°C, in cloudy water one method ("saturated" iodine) was less than completely effective, and in clear water four methods (bleach, Globaline, tincture of iodine and "saturated" iodine) failed to destroy all of the cysts. The failure of these methods appears to be related to either an insufficient halogen residual or contact time. This study underlines the importance of considering water temperature when employing halogen disinfection methods.

Accepted for publication May 22, 1979.