Determination of Total Selenium in Infant Formulas: Comparison of the Performance of FIA and MCFA Flow Systems

Table 4

Figures of merit: comparison of performance of the FIA and MCFA flow systems.

Parameter	FIA system	MCFA system
Detection limit (LD); (3σ/slope of calibration, 𝑛=10)	0.59 μg L^−1 in solution	0.08 μg L^−1 in solution
Quantification limit (LQ); (10σ/slope of calibration, 𝑛=10)	1.95 μg L^−1 in solution	0.27 μg L^−1 in solution
Linearity (μg · L^−1)	2–50 (𝑟2=0.999)	0.27–27 (𝑟2=0.999)
Precision 𝑠𝑟 (%) (𝑛=5)	<10	<10
Sampling frequency (hour^−1)	70	160
Sample consumption per determination (mL)	0.5	0.6
Reagent consumption for each determination	0.25 mL HCl*; NaBH4: 7.3 mg; *concentrated	0.05 mL HCl*; NaBH4: 2.5 mg; *concentrated