Removal of Lead from Water Using Calcium Alginate Beads Doped with Hydrazine Sulphate-Activated Red Mud as Adsorbent

Table 5

Lead concentration (before and after) of samples (samples collected from the effluents of lead-based industries in Andhra Pradesh, India).

S. number	Water samples	Ci (mg/l) (initial concentration of lead ions)	Cf (mg/l) (final concentration of lead ions)	% removal
(1)	Sample 1	4.24	0.42	89.9%
(2)	Sample 2	3.62	0.27	92.4%
(3)	Sample 3	2.89	0.16	94.3%
(4)	Sample 4	2.06	0.06	96.7%