Relative growth (g. g-1.d-1)       Mean ± S.D.
Arsenic ions con. mg/L               Days
  3 9 15
0.010 1.06 ± 0.01 1.14 ± 0.05 1.18 ± 0.01
0.025 1.11 ± 0.03 1.25 ± 0.03 1.28 ± 0.04
0.050 1.23 ± 0.02 1.26 ± 0.04 1.30 ± 0.03
0.10 1.25 ± 0.01 1.30 ± 0.02 1.34 ± 0.06
Bio-concentration factor
0.010 185 ± 1.24 207 ± 1.45 226 ± 0.65
0.025 166 ± 0.54 199 ± 0.62 230 ± 1.32
0.050 226 ± 1.44 235 ± 1.11 302 ± 2.05
0.10 227 ± 0.37 249 ± 2.21 323 ± 1.25
S.D. = Standard deviation
The standard deviation has been obtained for n=3
Table 1: The effects relative growth and bio-concentration factor of E. crassipes at different arsenic ions concentration and exposure times.