Assays

Contrast coefficients X1

X2

Atrazine degradation (%)

5 days

10 days

15 days

1

-1

-1

3.2

46.9

77.1

2

0

-1

4.1

48.5

88.4

3

1

-1

2.2

82.5

83.7

4

-1

0

2.9

48.7

86.9

5

0

0

3.6

82.6

93.0

6

1

0

2.4

72.7

91.1

7

-1

1

3.9

90.3

94.5

8

0

1

2.6

84.4

86.9

9

1

1

2.9

83.6

84.5

10

0

0

3.8

85.8

86.9

11

0

0

4.1

80.5

84.8

X1- FeSO4 (g L-1):(-1):0.001; (0): 0.0015; (+1): 0.002
X2- MnSO4 (g L-1): (-1):0.0 (0): 0.025; (+1): 0.05
Table 3: Experimental design (32) with encoded variables and atrazine degradation.