In Situ Transesterification of Spirulina Microalgae to Produce Biodiesel Using Microwave Irradiation

Table 6

ANOVA for Response Surface Quadratic Model.

Source	Sum of squares	Df	Mean square	value	value
Model	5464.62	9	607.18	170.10	<0.0001	Significant
, catalyst concentration	682.05	1	682.05	191.07	<0.0001
, volume of methanol	19.82	1	19.82	5.55	0.0402
, time	640.17	1	640.17	179.34	<0.0001
	97.99	1	97.99	27.45	0.0004
	71.41	1	71.41	20.01	0.0012
	4.41	1	4.41	1.23	0.2925
^2	743.91	1	743.91	208.40	<0.0001
^2	2976.89	1	2976.89	833.96	<0.0001
^2	859.35	1	859.35	240.74	<0.0001
Residual	35.70	10	3.57
Lack of fit	17.15	5	3.43	0.9247	0.5332	Not significant
Pure error	18.55	5	3.71
Cor. total	5500.32	19