Micelle-Mediated Extraction Prior to LC-UV for Preconcentration and Determination of Trace Amounts of Bisphenol A in Environmental Samples

Table 3

ANOVA results for experimental responses in the OA₁₆ (4⁵) matrix.

Factor	DOF^a	Sum of squares	Variance	𝐹-ratio^b	Pure sum of squares	% PC^c
pH (A)	3	1.1107×10^12	2.7768×10^11	0.21	9.283×10^11	5.99
% surfactant (B)	3	2.70846×10^12	6.77115×10^11	0.514	2.526×10^12	16.3
Ionic strength (C)	3	1.80809×10^12	4.52022×10^11	0.343	1.626×10^12	10.49
Temperature (D)	3	1.86311×10^12	4.65777×10^11	0.353	1.681×10^12	10.85
Organic solvent volume (µL)	3	7.03123×10^12	1.75781×10^11	1.333	6.849×10^12	44.21
Error	16	0.729×10^11	6.08062×10^10			12.16
Total	31	1.54945×10^13				100

aDegrees of freedom. ^b𝐹, critical value is 3.24 (𝑃<0.05). ^cPercent of contribution.