46
Lead
Cadmium
Zinc
700
600
500
400
Metal Removal Efficiency (mg/g)
300
200
100
Range of pH
3.0
3.5
4.0
4.5
5.0
Fig. 2.6 Removal
efficiency of heavy metals
by hydrogel with respect to
pH. (Modified Kweon
et al. 2001)
Fig. 2.7 Some sources of starch
A. Sabir et al.