RESUMO

The effect of Cr(6+) on Allium cepa root length was studied using both clean and polluted river waters. Seven series of Cr(6+)-doped polluted and non-polluted river waters were used to grow onions. Chromium concentration (Cr(6+)) of 4.2 mg L(-1)(EC(50) value), doped in clean river water caused a 50% reduction of root length, while in organically polluted samples similar root growth inhibition occurred at 12.0 mg Cr(6+) L(-1). The results suggested that there was a dislocation to higher values in toxic chromium concentration in polluted river water due to the eutrophization level of river water.

Assuntos

Cromo/toxicidade , Cebolas/efeitos dos fármacos , Raízes de Plantas/efeitos dos fármacos , Rios/química , Poluição da Água , Cromo/farmacologia , Relação Dose-Resposta a Droga , Cebolas/crescimento & desenvolvimento , Raízes de Plantas/crescimento & desenvolvimento , Testes de Toxicidade/métodos