Contador, Thais M.
Rocha, Giseli S.
Espindola, Evaldo L. G.
Total Authors: 4
 Univ Estadual Paulista UNESP, Inst Ciencia & Tecnol UNESP SJC, Dept Engn Ambiental, Parque Tecnol Sao Jose dos Campos, BR-12247016 Sao Jose Dos Campos, SP - Brazil
 Univ Sao Paulo, Escola Engn Sao Carlos, Ave Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 2
Anais da Academia Brasileira de Ciências;
Web of Science Citations:
The aim of this study was to evaluate the effect of phosphorus (P) on the toxicity of zinc (Zn) for the alga Raphidocelis subcapitata. P was provided in three concentrations: 2.3 x 10(-4) mol L-1, 2.3 x 10(-6) mol L(-1 )and 1.0 x 10(-6) mol L-1. Algal cells were acclimated to the specific P concentrations before the start of the experiment The chemical equilibrium software MINEQL(+) 4.61 was employed to calculate the Zn2+ concentration. After acclimated, the algal cells were inoculated into media containing different Zn concentrations (0.09 x 10(-6) mol L(-1 )to 9.08 x 10(-6) mol L-1). The study showed that besides the reduction in algal growth rates, phosphorus had an important influence on the toxicity of zinc for microalga. The inhibitory Zn2+ concentration values for R. subcapitata were 2.74 x 10(-6) mol L-1 0.58 x 10(-6) mol L-1 and 0.24 x 10(-6) mol L-1 for the microalgae acclimated at P concentrations of 2.3 x 10(-4) mol L-1, 2.3 x 10(-6) mol L-1 and 1.0 x 10(-6) mol L-1 respectively. Ecotoxicological studies should consider the interaction between metal concentrations and varying P values to provide realistic data of what occurs in phytoplankton communities in environments. (AU)