Micro-crustaceans: biological models to evaluate a remediation process for water polluted with glyphosate

RENO, U.; GUTIERREZ, F.; LONGO, M.; E.G. VIDAL; REGALDO, L.; A. NEGRO; M.L. MARIANI; C.S. ZALAZAR; GAGNETEN, A.M.

WATER AIR AND SOIL POLLUTION

SPRINGER

Lugar: Amsterdam; Año: 2015 vol. 226 p. 226 - 349

0049-6979

Ecotoxicity studies using two glyphosatebasedformulations (Eskoba® and Sulfosato Touchdown®) were undergone with three microcrustaceanspecies to establish their LC50 values and to evaluatethe efficacy of cleaning treatments with UV/H2O2.Samples were collected at the beginning of theprocess −50 mg acid equivalent per liter of glyphosatewithout H2O2 and at different treatment timepoints: 2, 4,and 6 h. Three microcrustacean species were used asbiological models.The Eskoba® LC50 ranged between14.49 and 95.23 acid equivalents (a.e.) mg L−1and forSulfosato Touchdown® between 0.31 and 1.74 a.e. mgL−1. The glyphosate-based formulations registered thefollowing order of sensitivities: Ceriodaphnia dubia >Daphnia magna > Notodiaptomus conifer. The treatmentduration and mortality (%) were negative andsignificantly correlated for both formulations, indicatingthat the remediation process diminished the glyphosateconcentration. Therefore, microcrustacean mortality decreasedlinearly with the remediation time. C. dubia andN. conifer were more sensitive than the holarcticD. magna to the remediation process, since the firsttwo species showed greater percentage of mortality at6 h of processes, compared with D. magna, for bothformulations evaluated. Sulfosato Touchdown® wasmore toxic but showed greater degradability thanEskoba®. The results provide relevant information regarding(1) the urgency to clearly identify the additiveson product labels, (2) the efficiency of UV/H2O2 processfor reducing adverse effects of two glyphosatebasedformulations, and (3) the importance of developingstudies to evaluate the effectiveness of cleaner technologieswith an emphasis on microcrustacean speciesas biological models.