Table 1.

ANOVA of the data obtained with the 2² central composite design for optimization of experimental variables in LTG determination with CSPE by DPAdSV. [LTG] = 2.0 × 10^-5 M, pH = 5.5

Effect	SS*	DF*	MS*	Fratio*	Plevel*
A: Edep	2478.870	1	2478.870	10.900	0.081
B: tdep	1407.510	1	1407.510	6.190	0.131
AA	18565.500	1	18565.500	81.670	0.012(a)
AB	5.664	1	5.664	0.020	0.889
BB	50502.10	1	50502.100	222.160	0.004(a)
Lack-of-fit	4720.510	3	1573.500	6.920	0.129
Pure error	454.648	2	227.324
Total	64957.800 R2 = 92.033	10

^*SS, sum of squares; DF, degrees of freedom; MS, mean squares; F_ratio: MS_factor/MS_error; P_level, probability level.

^(a)Significant factor at α = 0.05.