Sample number

Na₂S (gr/L)

H₂SO₄ (N)

Pb (ppm)

Cu (ppm)

Zn (ppm)

Fe (ppm)

Time (min)

pH

1

5

0.006

11.46

67.97

79.81

62.35

15

10

2

5

0.008

40.86

71.94

81.73

66.05

15

9

3

5

0.01

63.46

83.05

82.10

75.45

15

8

4

5

0.012

68.80

83.36

83.81

83.65

15

7

5

10

0.014

73.06

89.64

95.98

90.57

15

6

6

10

0.016

86.66

93.83

98.09

93.75

15

5

7

10

0.018

97.33

97.44

99.44

98.83

15

4

8

10

0.02

99.20

99.10

99.54

99.76

15

3