Assessment of toxic effects of magnetic particles used for lake restoration on Chlorella sp. and on Brachionus calyciflorus
Identificadores
URI: http://hdl.handle.net/10481/52560Metadatos
Afficher la notice complèteAuteur
Álvarez-Manzaneda Salcedo, María Inmaculada; Vicente Álvarez De Manzaneda, María Inmaculada DeMateria
Magnetic particles Toxicity Lake restoration Eutrophication Brachionus calyciflorus Chlorella sp
Date
2017Referencia bibliográfica
Chemosphere 187: 347-356
Patrocinador
This work was supported by Junta de Andalucía projects P10- RNM-6630 and P11-FQM-7074 (Proyectos de Excelencia, Spain), MINECO CTM 2013e46951-R, MAT 2013e44429-R and PCIN 2015- 051 projects (Spain) and by the European Founding for the Regional Development (Fondo Europeo de Desarrollo Regional, FEDER).Résumé
Laboratory tests, by following standardized Organization for Economic Co-operation and Development
(OECD) protocols, were run for evaluating the acute effects of iron magnetic microparticles (MPs),
recently proposed for lake restoration, on Chlorella sp. (algal growth) and on the rotifer B. calyciflorus
(mortality). In addition, the MPs potential indirect effects on rotifer egg bank were assessed by performing
hatching rate test with B. calyciflorus cysts in contact with dissolved iron (Tot-Fedis). In the algal
growth test, no inhibition occurred at the two lowest MPs concentrations (0.01 and 0.05 g l 1) which
would correspond, considering the adsorption efficiency ratio (Phosphorus: MPs), to P concentrations
lower than 0.94 mg P l 1, much higher than typical concentrations found in natural waters. For higher
MPs dose (EC50 for Chlorella sp. was 0.15 g l 1), no nutrient limitations but high turbidity and Tot-Fedis
values cause negative effects on algal growth. For the case of B. calyciflorus, LC50 was 1.63 g MPs l 1
(corresponding to 30.7 mg P l 1). When analyzing Tot-Fedis effect, the hatching rate of B. calyciflorus cysts
was 100% for all treatments. To sum up our results for B. calyciflorus acute and chronic toxicity tests, it is
extremely unlikely the mortality of adult organisms in contact with MPs as well as an affectation of the
rotifer egg bank. In conclusion, it is expected that MPs addition in a real whole-lake application cause
minor lethal and sublethal effects on both Chlorella sp. and B. calyciflorus.