Comparative effects of technical-grade and a commercial formulation of glyphosate on the pigment content of periphytic algae

M.S. VERA; JUÁREZ, A.; PIZARRO, H

BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY

SPRINGER

Lugar: Berlin; Año: 2014 vol. 93 p. 399 - 404

0007-4861

We investigated the potentially different effects of one of the most commonly used glyphosate formulations in Argentina, Glifosato Atanor®, and the technical-grade glyphosate on the pigment content, as biomass indicators of the algal fraction in a freshwater periphytic community. A laboratory bioassay was carried out in 250-ml beakers. Two treatments were used: technical-grade glyphosate acid and Glifosato Atanor® (isopropylamine salt of glyphosate 48 % w/v), which were at a concentration of 3 mg active ingredient per liter. Treatments and the control (without herbicide) were replicated in triplicate. The concentrations of chlorophyll a and b and carotenes were determined at 0, 2, 6, 10, 24, 48, 96 and 192 h after herbicide addition. A significant increase in pigment content was observed for both herbicides after a two-day exposure. Moreover, the formulation had little or no effect compared to the active ingredient, suggesting that the additives of Glifosato Atanor® may not enhance glyphosate toxicity