	Metal (mg/l)	School
	Metal (mg/l)	A	B	C
Concentration present	Cu	49.88 ± 0.67	60.46 ± 3.14	32.48 ± 1.44
Concentration present	Pb	27.72 ± 1.37	68.56 ± 0.70	52.62 ± 2.08
% adsorption	Cu	45.80	15.80	68.98
% adsorption	Pb	62.18	59.06	85.45