A set of river water was analyzed selecting the operational condition shown in Table 3 (line 3). To allow accuracy assessment the samples were also analyzed employing the usual FIA procedure [29] yielding the results shown in Table 4. A applying the paired t-test for both analytes were found 2.23 while the reference value was 2.57, thus indicating that no significant difference at 95% confidence level was observed. Other advantages such as low reagent consumption (75μg) and reduced waste generation (1.6 ml) per determination and a sampling throughput of 40 determinations per hour were also achieved