3.1. Bioconcentration of MeHg by different microalgae
Compared to their respective controls, the growth of three
species of algaewas unaffected by 1 mg L1 MeHg treatment (Fig. 2).
After three days, the growth of algae increased. Fig. 3 showed the
accumulation of total Hg by the different algae at the third day. The
results indicated that Hg concentrations of Chlorella sp.,
N. closterium and I. galbana were 27.91, 32.74 and 40.03 mg g1,
respectively. The difference was statistically significant (p < 0.05).
Based on these results, we chose the algae exposed to MeHg for
three days as the food of zooplankton.