The half-lives of biological activity of some pesticides in water

Kyaw Myint Oo, (2001) The half-lives of biological activity of some pesticides in water. Naga, the ICLARM Quarterly, 24(3-4), pp. 11-13.

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In the absence of analytical methods, the half-lives of biological activity of pesticides can be estimated by bioassays. To determine the half-lives of biological acivity of pesticides to fish, static bioassays were conducted in the laboratory with ten different formulations of pesticides using Labeo rohita as a bio-indicator. The half-lives of biological activity for ten different pesticides in soft water at pH 7.5 and 27°C, ranged from 4.6 days to 11.8 days. The half-life of biological activity of Sumithion 50% EC was only 4.6 days. In contrast, Dimecron 50% EC degraded very slowly and its half-life of biological activity on L. rohita was about 11.8 days. Sumithion 50% EC, Padan 50% SP, EPN 45% EC, Diazinon 40% EC and Diazinon 10 G degraded in less than five to seven days indicating that these pesticides are desirable for rice-fish culture. Contamination by pesticides with long-term residual toxicity in waters may eventually cause high levels of fish mortality.

Item Type: Article
Title: The half-lives of biological activity of some pesticides in water
Personal Creator/Author:
Kyaw Myint Oo,
Journal or Publication Title: Naga, the ICLARM Quarterly
Volume: 24
Number: 3-4
Page Range: pp. 11-13
Date: 2001
ISSN: 0116-290X
Issuing Agency: WorldFish Center
Uncontrolled Keywords: Pesticides; Bioassays; Rice field aquaculture; Water; Labeo rohita
Subjects: Aquaculture
Item ID: 9300
Depositing User: Mr William Ko
Date Deposited: 30 Nov 2012 12:38
Last Modified: 30 Nov 2012 12:45

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