Uncertainties estimated

Compound	Precision,%(u₄)	Accuracy,%(u₅)	Linearity regression,%(u₆)	U_c (%)	U_e, k=2,(%)
TCS	1.88	-3.13	3.46	5.40	10.80
DIU	1.66	-3.14	2.92	5.00	10.00
17EE	1.53	-2.18	2.99	4.46	8.92
BPA	0.19	-2.30	2.86	4.17	8.34
17E	0.28	-2.35	2.78	4.15	8.30
CBZ	2.43	-2.50	2.67	4.81	9.62
GBD	2.03	-2.41	2.63	4.55	9.10

Table 3: Uncertainties estimated in each step of ECs analysis for each compound. Uncertainty associated with stock solution preparation at 1000 mg/L (u₁), working solution preparation at 100 mg/L (u₂) and sample treatment (u₃) is 1.20, 0.59 and 1.45 %, respectively.