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 Hoffman, D. O. Articles by Zakhary, R. Search for Related Content PubMed PubMed Citation Articles by Hoffman, D. O. Articles by Zakhary, R. Pubmed/NCBI databases Compound via MeSH Substance via MeSH Hazardous Substances DB COPPER, ELEMENTAL

The Relationship of Exposure Time to the Molluscicidal Activity of Copper Sulfate¹

In a study of the relationship between molluscicidal activity and exposure time, Biomphalaria boissyi were exposed to copper sulfate in pond water at 20°C. for various lengths of time. Expressed in terms of CuSO₄·5H₂O, LD₅₀ decreased from 55 p.p.m. following a 6-hour exposure period to 1.35 p.p.m. after an exposure of 72 hours. From a comparison of these data with the results of other workers it is concluded that the use of tap water in copper sulfate evaluation tests results in a considerably higher mortality than the use of natural waters from sites favorable for snail colonization. This effect is not due to the presence in natural water of factors which rapidly remove copper sulfate from solution.

It is suggested that the use of low copper concentrations maintained for an extended period of time might be more effective and less expensive than the high concentrations which result when solid copper sulfate is dissolved directly in canal water.

¹ The opinions or assertions contained in this article are the private ones of the authors and are not to be construed as official or reflecting the views of the Navy Department.

² Mailing address: c/o American Embassy, Cairo.