Accurate Determination, Matrix Effect Estimation, and Uncertainty Evaluation of Three Sulfonamides in Milk by Isotope Dilution Liquid Chromatography-Tandem Mass Spectrometry

Table 2

Estimated individual uncertainty, relative uncertainty (), and expanded relative uncertainty (U, k = 2) of three spiked levels (%).

Spiked levels	Uncertainty	SDZ	SMZ	SDM
1 μg/kg (n = 6)		2.01	1.00	1.01
		1.80	1.80	1.80
		0.99	0.28	1.00
		2.87	2.08	2.30
	U	5.75	4.16	4.59
10 μg/kg (n = 6)		2.01	1.00	1.01
		0.18	0.18	0.18
		0.58	0.26	0.17
		2.10	1.05	1.04
	U	4.20	2.10	2.08
20 μg/kg (n = 6)		2.01	1.00	1.01
		0.09	0.09	0.09
		0.42	0.10	0.38
		2.06	1.01	1.08
	U	4.11	2.02	2.16