Comparative Toxicity of Two Different Dimethoate Formulations in the Common Toad (Rhinella arenarum) Tadpoles

MARTINUZZI C; ATTADEMO A.M.,; PELTZER P.,; TOMÁS M. MAC LOUGHLIN; DAMIÁN J MARINO ; LAJMANOVICH, RAFAEL C

BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY

SPRINGER

Lugar: Berlin; Año: 2019 vol. 104 p. 35 - 40

0007-4861

Dimethoate (D) are among the most commonly used organophosphates insecticides in the world. To evaluate the toxicityof two D formulations were selected as test organisms tadpoles of Rhinella arenarum. This toad species has an extensiveneotropical distribution and is easy to handle and acclimate to laboratory conditions. The tadpoles were exposed in an acuteassay for 48 h to D soluble concentrates (DSC) and emulsifiable concentrates (DEC). The 48 h-LC50 (95% confidence limits)value of DSC was 57.46 mg L−1 (40.52?81.43) and to DEC was 12.76 mg L−1 (10.39?15.68). These differences in toxicitywere statistically significant (p < 0.05). In both formulations, acetylcholinesterase), carboxylesterase, and glutathione-Stransferasesenzyme activities varied significantly respect to those of control group (p < 0.05). The DEC formulation wasthe most toxic. These results would allow the assessment