Table 4: Figures of merit: comparison of performance of the FIA and MCFA flow systems.

ParameterFIA systemMCFA system

Detection limit (LD)
(3σ/slope of calibration, )
0.59 μg L−1 in solution 0.08 μg L−1 in solution
Quantification limit (LQ)
(10σ/slope of calibration, )
1.95 μg L−1 in solution0.27 μg L−1 in solution
Linearity (μg · L−1)2–50 ( )0.27–27 ( )
Precision (%) ( )<10<10
Sampling frequency (hour−1)70160
Sample consumption per determination (mL) 0.5 0.6
Reagent consumption for each determination0.25 mL HCl*
NaBH4: 7.3 mg
*concentrated
0.05 mL HCl*
NaBH4: 2.5 mg
*concentrated