Cr(VI) Treatment

 

Specific growth rate, µ hr-1

 

Aspergillus niger

 

Aspergillus parasiticus

 

Control
0 mg/l

 

0.27 ± 0.02

 

0.21 ± 0.06

 

5 mg/l

 

0.29 ± 0.04

 

0.18 ± 0.01

 

10 mg/l

 

0.25 ± 0.02

 

0.22 ± 0.03

 

15 mg/l

 

0.24 ± 0.01

 

0.18 ± 0.06

 

20 mg/l

 

0.25 ± 0.05

 

0.17 ± 0.02
Values are mean ± S.D. of four determinations (P>0.05).
Table 4: Specific growth rate, μ (hr-1) of A. niger and A. parasiticus regenerated from hexavalent chromium treated cultures into chromium-free medium.