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A flow system for spectrophotometric multidetermination in waters is proposed. Reagent aliquots (25-75 μL) were inserted into the sample stream, allowing up to 4.5-fold increase in sensitivity and an average 12-fold reduction in reagent consumption. The system allows the determination of phosphate (0.25  5.0 mg L-1), phenols (0.10  1.0 mg L-1), nitrite (0.050  0.50 mg L-1), sulphide (0.10  1.0 mg L-1) and total iron (1.0  5.0 mg L-1) without changing the flow manifold. Detection limits of 150 μg L-1 PO43-, 10 μg L-1 phenol, 2 μg L-1 NO2-, 20 μg L-1 sulphide and 15 μg L-1 Fe3+ were estimated at the 99.7 % confidence level. Coefficients of variation were lower than 4 % (n = 20). Results for river and lake water samples were in agreement with the obtained with flow systems with continuous reagent addition at the 95 % confidence level.

A Flow System for Spectrophotometric Multidetermination in Water Exploiting Reagent Injection