Jm. Estela et al., SIMULTANEOUS DETERMINATION OF IONIC SPECIES BY SEQUENTIAL INJECTION-ANALYSIS USING A SANDWICH TECHNIQUE WITH LARGE-SAMPLE VOLUMES, International journal of environmental analytical chemistry, 64(3), 1996, pp. 205-215
In this work we investigated the feasibility of using large sample vol
umes in sequential injection analysis with a view of determining vario
us analytical parameters in a unique sample injection. The use of two
reagents separated by a large sample volume allows the determination o
f two different parameters in the sample. The accuracy with which the
two resulting peaks (one for each reaction) can be resolved and the li
near working ranges are dependent on both the injected sample volumes
and reagent, together with their concentrations. Under given condition
s, the proposed methodology can be applied over a certain analyte conc
entration range. For validation purposes the proposed methodology was
applied to the simultaneous determination of Fe(II) and nitrite ions f
or their well-known o-phenanthroline and Griess reactions, respectivel
y.