Table 2.

Regression data and representative statistical parameters of the analytical method.

	One day	Different days
a	0.462 ± 0.546	0.664 ± 0.548
b	1.214 ± 0.075	1.262 ± 0.068
c	−0.003 ± 0.002	−0.004 ± 0.002
R2	0.999	0.997
Sy/x	0.646	0.754
LOD (ng)	1.6	1.8
Added (ng)	20.08	19.96
(ng)	19.99	19.94
S (ng)	1.37	1.1
RSD (%)	6.86	5.54
E (%)	4.61	5.12
n	11	7
ttab	2.23	2.45
texp	0.7	0.02
t′exp	0.22	0.06