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Table 7 Factors coded as dummy variables

From: Reduction of arsenic content in a complex galena concentrate by Acidithiobacillus ferrooxidans

Pattern

Run

Pulp Density

Surface Area

Ferric Chloride

Carbon Dioxide

Air

9 K medium

Strain

Results As mg/l

----+++

1

0

0

0

0

1

1

1

R1

--++--+

2

0

0

1

1

0

0

1

R2

-+-+-+-

3

0

1

0

1

0

1

0

R3

-++-+--

4

0

1

1

0

1

0

0

R4

+--++--

5

1

0

0

1

1

0

0

R5

+-+--+-

6

1

0

1

0

0

1

0

R6

++----+

7

1

1

0

0

0

0

1

R7

+++++++

8

1

1

1

1

1

1

1

R8

  1. Results of As in leachate (mg/l) were determined each 48 hours, to finally have the results of this table 15 times during the 28 days of the experiment