Table 4.

Regression model and analysis of variance for ZEN degradation rate.

Source of Variation	Sum of Squares	df	Mean Square	F-Value	p-Value	Significance
Model	297.84	9	33.09	136.26	<0.0001	**
A: Temperature	0.8845	1	0.8845	3.64	0.0980
B: Time	1.49	1	1.49	6.13	0.0425	*
C: Solid-to-liquid ratio	126.80	1	126.80	522.12	<0.0001	**
AB	0.0020	1	0.0020	0.0083	0.9298
AC	0.2256	1	0.2256	0.9290	0.3672
BC	1.88	1	1.88	7.73	0.0273	*
A2	20.75	1	20.75	85.44	<0.0001	**
B2	19.96	1	19.96	82.20	<0.0001	**
C2	112.00	1	112.00	461.17	<0.0001	**
Residual	1.70	7	0.2429
Lack of Fit	1.26	3	0.4206	3.84	0.1133	Not significant
Pure Error	0.4382	4	0.1095
Total	299.54	16

Note: ** p < 0.01 (highly significant); * p < 0.05 (significant).