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

Table 1

Influence of the FIA system variables: multivariate design.

Experiment	Flow rate HCl (mL min^−1)	Flow rate NaBH4 (mL min^−1)	Mixing coil length (cm)	Absorbance Se(IV) 50 μg · L^−1 dissolution (𝑛=3)
1	1.3	1.7	150	0.044
2	2.9	3.6	150	0.069
3	3.5	4.5	50	0.076
4	1.3	1.7	100	0.047
5	2.9	3.6	100	0.069
6	2.2	2.8	100	0.062
7	3.5	4.5	100	0.072