Sample number

Na2S (gr/L)

H2SO4 (N)

Pb (ppm)

Cu (ppm)

Zn (ppm)

Fe (ppm)

Time (min)

pH

0

0

0

3.75

6569

8770

4277

0

12

1

5

0.006

3.32

1843

1602

1452

15

10

2

5

0.008

1.88

2104

1770

1610

15

9

3

5

0.01

1.37

1113

1569

1050

15

8

4

5

0.012

1.17

1093

1419

699

15

7

5

10

0.014

1.01

680

352

403

15

6

6

10

0.016

0.91

405

167

267

15

5

7

10

0.018

0.80

168

49

50

15

4

8

10

0.02

0.5

59

40

10

15

3