Abstract

Four arsenicals including organic and inorganic forms of both the trivalent and pentavalent states were tested for their potential environmental effect on a nontarget animal species. Cacodylic acid, cacodylic acid plus sodium cacodylate, arsenic trioxide, and arsenic pentoxide were evaluated in terms of formulation, exposure time, and tissue arsenic concentrations on the survival of an exposed population of meadow katydids. Tissue concentrations of elemental arsenic were higher for organic forms than for inorganic forms at similar exposure dosages. Life expectancies were reduced to less than 10 percent of unexposed populations by levels above 5 ..mu..g As/g dry weight in dosing formulations. While As concentrations in katydid tissues did not exceed those in the dosing formulations, they did exceed tissue concentrations found in unexposed populations by as much as three orders of magnitude. These results illustrate the impact of herbicidal arsenic formulations on a nontarget animal species.

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