Acute toxicity of isomers of the pyrethroid insecticide deltamethrin and its major degradation products to Daphnia magna / by K.E. Day, R. James Maguire. : En13-5/89-161E-PDF

"The acute toxicities (4-h, 24-h and 48-h) of eight stereoisomers and four major breakdown products of deltamethrin to D. magna were determined. Parent deltamethrin (isomer 1) was the most toxic, with EC50 values in the range 0.05-1.75 ug/L, concentrations which have been observed in the surface microlayer and subsurface water in field studies. The other three isomers (2-, 3- and 4-deltamethrin) were two- to tenfold less toxic than 1-deltamethrin. Isomers 1', 2', 3' and 4' plus the four breakdown product studied displayed no significant toxicity. Since 1-deltamethrin can be converted in natural water to 2', 3- and 4'- deltamethrin, and since 3-deltamethrin is toxic to D. magna, this isomerization is only a partial detoxification step as far as some aquatic organisms are concerned"--Abstract.

Lien permanent pour cette publication :
publications.gc.ca/pub?id=9.873840&sl=1

• Format MARC XML
• Format MARC HTML

Demander des formats alternatifs