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Table 3 The 27–4 design used.

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
----+++ 1 10 Low No added No added Added Added T18
--++--+ 2 10 Low Added Added No added No added T18
-+-+-+- 3 10 High No added Added No added Added T1
-++-+-- 4 10 High Added No added Added No added T1
+--++-- 5 20 Low No added Added Added No added T1
+-+--+- 6 20 Low Added No added No added Added T1
++----+ 7 20 High No added No added No added No added T18
+++++++ 8 20 High Added Added Added Added T18