pH = 6

pH = 5

pH = 4

pH = 3

Time (min)

Lead recovery %

Lead recovery %

Lead recovery %

Lead recovery %

10

44.39

48.52

53.24

47.53

20

62.01

63.29

71.03

63.68

30

-

-

78.79

-

40

81.62

84.48

84.66

81.50

60

95.54

96.89

-

94.06

90

99.93

99.92

-

100