Influencing factors on Ni bioaccumulation by Synechcoccus

Influencing factors on Ni bioaccumulation by Synechcoccus were studied. The equilibration time of Ni bioaccumulation was about 80 min in aqueous solution. The bioaccumulation quantity reached a maximum when the mass ratio of Ni to Synechcoccus was between 16%-18%, and increased with the increasing of pH. The optimum pH was 9-10 because high pH would lead to precipitation of Ni(OH)2. The bioaccumulation quantity was also influenced by temperature and illumination intensity and the optimal condition was 35 ℃ and 3000 lx. The bioaccumulation of nonliving algae was lager than that of living algae.