Monitoring of toxicity of As(V) solutions by AMPHITOX test without and with treatment with zerovalent iron nanoparticles

PABÓN-REYES, CAROLINA; MEICHTRY, JORGE M.; PÉREZ COLL, CRISTINA S.; LITTER, MARTA I.

ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY

ELSEVIER SCIENCE BV

Año: 2019 vol. 60 p. 138 - 145

1382-6689

Changes in toxicity of As(V) solutions from acute to chronic exposure have been evaluated by the AMPHITOXtest. This test employs Rhinella arenarum, a widely distributed toad in Argentine areas. LOEC values were 6.37and 1.88 mg L− 1 for embryos and larvae, respectively, and serious sublethal effects have been observed. Toxicityof As(V) solutions has been also evaluated after treatment with zerovalent iron nanoparticles (nZVI). After60 min of treatment with nZVI, As(V) removal was 77%, and neither lethal nor sublethal effects were observed.However, nZVI had to be eliminated before the bioassay because they caused adverse effects in both embryosand larvae. This work highlights the high sensitivity of R. arenarum to As(V), the relevance to assess toxicity ondifferent periods of the lifecycle, and the need to expand exposure to As(V) to chronic times. The utility of thetest for monitoring toxicity changes in As(V) solutions after nZVI treatment has been also shown.