T = 40˚C

T = 50˚C

T = 60˚C

T = 70˚C

Time (min)

Lead recovery %

Lead recovery %

Lead recovery %

Lead recovery %

10

59.59

62.51

64.41

-

20

76.65

78.89

79.54

77.11

30

-

84.7

-

-

40

86.74

88.74

90.11

93.27

60

96.76

-

96.28

99.49

90

99.96

-

98.79

99.89