Metal (mg/l)

School

A

B

C

Concentration present

Cu

49.88 ± 0.67

60.46 ± 3.14

32.48 ± 1.44

Pb

27.72 ± 1.37

68.56 ± 0.70

52.62 ± 2.08

% adsorption

Cu

45.80

15.80

68.98

Pb

62.18

59.06

85.45