Toxicity Persistence Following an Experimental Cypermethrin and Chlorpyrifos Application in Pampasic Surface Waters (Buenos Aires, Argentina)

H. MUGNI, P. DEMETRIO, D. MARINO, A. RONCO, C. BONETTO

BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY

SPRINGER

Año: 2010 vol. 84 p. 524 - 528

0007-4861

The Pampa plain is intensively cultivated, being the genetically modified glyphosate-resistant soybean the main culture. A small first order stream draining a cultured farm was studied. During the dry 2007 spring, the channel became a wetland with remnant intercalated shallow pools. Toxicity persistence of cypermethrin and chlorpyrifos to the amphipod H. curvispina was assessed following a simulated plane application in the recently formed pools. In situ exposures and laboratory toxicity tests were performed. An ephemeral toxicity pulse lasting 4 h after the application, and mortality cessation since then was observed.