Figure 7.

In vivo and in vitro EPS-mediated bioadsorption of arsenic. In vivo dose-dependent (0, 2, 4, 6 mM) (A) and time-dependent (3, 6, 9, 12 days) (B) arsenic sequestration from ambient salt media by EPS from Halomonas sp. Exo1. 0.86 mg kg⁻¹ (dry weight) [As(III)] was detected in 5-day EPS from 8% TSMGM without As while 2.46 mg kg⁻¹ (dry weight) trace [As(III)] was detected in 3-day EPS from 8% TSMGM without As (negative control) (C) In vitro bioadsorption of arsenic by Exo1. The amounts of bioadsorped [As(III)] and [As(V)] in mg kg⁻¹ dry weight of purified EPS incubated overnight at 4°C in solutions containing 4 mM [As(III)] and 10 mM [As(V)], respectively. Exo1 without [As(III)]/[As(V)] treatment was used as control. Error bars represent mean ± standard deviation of triplicate values.