Optimization of chromium and tannic acid bioremediation by Aspergillus niveus using Plackett–Burman design and response surface methodology

AMB Express

Table 4 Analysis of variance (ANOVA) of A. niveus for the fitted quadratic polynomial model for residual tannic acid and chromium

Response variable	Source	Sum of squares	Degree of freedom	Mean square	F value	P value prob > F
Tannic acid	Model	5956.30	14	425.45	72757.21	< 0.0001^a
	Lack of fit	0.064	9	7.149E−003	2.45	0.2016^b
	Pure error	0.012	4	2.920E−003
	Cor total	5956.38	27
Chromium	Model	259.18	14	18.51	8.73	< 0.0002^a
	Lack of fit	13.13	9	1.46	0.40	0.8804^b
	Pure error	14.42	4	3.60
	Cor total	286.73	27