Development of a flow manifold for Fe(III) ion determination with a fluoride ion-selective electrode.
Continuous-flow (CF) and flow-injection (FI) analysis using the fluoride ion-selective electrode (FISE) as detector have been investigated. The measurements were performed in a home-made cell under appropriate flow conditions (2.86 or 3.45mlmin(-1), 0.2ml samples, 10(-6)M sodium fluoride). The calibration graph was obtained by plotting the signal height versus concentration of iron in the range of Fe(III) concentration from 10(-5) to 10(-1)M in acetate buffer (pH 2.8 or 3.4). In all described procedures, the range of linear response extends to the Fe(III) concentration from 1x10(-3) to 1x10(-1)M, with detection limit 9x10(-5)M. The effect of double-line, two-line flow manifold and CF was investigated and discussed.
Bralić
M
M
Department of Chemistry and Environmental Chemistry, Faculty of Chemical Technology, University of Split, Teslina 10V, 2100 Split, Croatia.
Brinić
S
S
Generalić
E
E
Vrsalović
L
L