Table 3.

Variation in rate of adsorption of heavy metals by 0.5 g feathers in 100 mL FMBs that contains 5 ppm (0.005 mg/mL) of each heavy metal under different media pH

Heavy metals (initial concentrations 0.005 mg/mL)	Amount of heavy metal adsorbed (in mg/mL) by 5% (w/v) of feather per 100 mL of FMB adjusted to different pH
	4.0	5.0	6.0	7.0	8.0	9.0	10.0	11.0
Ag	0.000 ± 0.0	0.001 ± 1.2	0.0017 ± 0.1	0.0026 ± 0.0	0.0032 ± 0.1	0.0024 ± 0.0	0.0013 ± 0.0	0.000 ± 0.0
As	0.000 ± 0.0	0.000 ± 0.0	0.0020 ± 0.0	0.0041 ± 0.0	0.0050 ± 0.1	0.0026 ± 1.2	0.0020 ± 1.1	0.001 ± 0.1
Cd	0.001 ± 1.4	0.0031 ± 0.2	0.0048 ± 1.2	0.0041 ± 0.0	0.0034 ± 0.0	0.0026 ± 0.1	0.0010 ± 0.0	0.000 ± 0.0
Co	0.0010 ± 0.0	0.0029 ± 0.5	0.0032 ± 1.0	0.0044 ± 0.0	0.0050 ± 0.0	0.0032 ± 0.0	0.0013 ± 0.2	0.000 ± 0.0
Cu	0.000 ± 0.0	0.0010 ± 0.0	0.0011 ± 0.1	0.0021 ± 0.2	0.0048 ± 1.0	0.0043 ± 0.0	0.0027 ± 0.1	0.0012 ± 0.0
Hg	0.0041 ± 0.1	0.005 ± 0.0	0.0037 ± 0.2	0.0028 ± 0.0	0.0023 ± 0.1	0.0018 ± 0.1	0.000 ± 0.0	0.000 ± 0.0
Ni	0.0034 ± 1.1	0.0043 ± 0.1	0.0038 ± 0.0	0.0031 ± 0.2	0.0023 ± 0.3	0.0018 ± 0.0	0.0001 ± 0.0	0.000 ± 0.0
Pb	0.0012 ± 0.1	0.0023 ± 0.0	0.0026 ± 0.0	0.0039 ± 0.2	0.0046 ± 0.0	0.0039 ± 1.3	0.0023 ± 0.0	0.0018 ± 0.0
Zn	0.0019 ± 0.1	0.0027 ± 0.0	0.0039 ± 0.4	0.0041 ± 1.0	0.0034 ± 0.3	0.0021 ± 0.0	0.0013 ± 0.1	0.0010 ± 0.0