Table 2.

Variation in net weight of 0.5 g feathers in 100 mL FMBs that contains 5 ppm of each heavy metal under different media pH

Heavy metal (MM)	Net weight gain 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 (107.87)	0.55 ± 1.4e	0.6 ± 0.5e	0.83 ± 0.9d	2.64 ± 2.3b	3.72 ± 1.1a	2.74 ± 3.2b	2.71 ± 0.0b	1.61 ± 2.4c
As (74.922)	0.01 ± 2.1d	0.12 ± 2.9d	0.68 ± 1.3c	1.70 ± 2.0b	1.94 ± 1.9a	0.74 ± 4.2c	0.73 ± 4.1c	0.65 ± 0.0c
Cd (112.41)	1.43 ± 3.1c	2.98 ± 3.4a	2.81 ± 1.9a	1.83 ± 1.9b	1.78 ± 0.4b	0.86 ± 1.4d	0.76 ± 2.7d	0.48 ± 2.4e
Co (58.922)	0.21 ± 0.4e	0.39 ± 2.5de	0.72 ± 3.5bc	1.71 ± 3.0a	1.95 ± 0.7a	1.02 ± 0.9b	0.69 ± 0.3c	0.59 ± 1.7cd
Cu (63.546)	0.45 ± 1.0d	0.51 ± 1.5d	1.68 ± 4.1b	1.79 ± 2.8b	2.73 ± 1.0a	2.71 ± 0.1a	0.70 ± 1.0c	0.51 ± 1.3d
Hg (200.59)	4.32 ± 0.3a	4.81 ± 0.7b	3.77 ± 2.5c	2.81 ± 1.9d	1.85 ± 2.5e	1.35 ± 1.1f	0.83 ± 0.6 g	0.80 ± 1.2g
Ni (58.693)	2.11 ± 1.4a	2.21 ± 0.7a	1.57 ± 0.1b	1.09 ± 4.2c	1.02 ± 3.8c	0.70 ± 2.2d	0.31 ± 0.5e	0.07 ± 0.4f
Pb (207.2)	2.26 ± 2.6d	2.34 ± 1.3d	3.72 ± 1.0b	3.84 ± 3.2b	4.36 ± 0.2a	2.87 ± 2.2c	1.37 ± 1.1e	0.99 ± 1.0e
Zn (65.723)	0.52 ± 3.1f	1.45 ± 2.0e	2.29 ± 2.4b	2.62 ± 2.3a	2.03 ± 2.3c	1.72 ± 3.0d	0.81 ± 1.0f	0.70 ± 0.1f

Results are expressed as mean ± SD. Mean values that do not share a letter within a row are significantly different (p < 0.05)

MM Molecular weight