"New Approach To The Simultaneous Determination Of Pollutants In Waste Water By Flow Injection Analysis. 1. Anionic Pollutants"
Analyst
1984 Volume 109, Issue 11 Pages 1487-1492
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Angel Ríos, M. Dolores Luque de Castro and Miguel Valcárcel
Abstract:
The general manifold described, which operates on the principle of reversed-flow injection, incorporates several injection valves that permit the insertion of specific reagents for the spectrophotometric determination of each species at different points in the waste-water stream. By positioning a glass - calomel micro-electrode in front of these valves, the pH can be monitored continuously. A single detector is used for analytes undergoing reaction, thereby allowing the concentration. of several pollutants in the sample to be measured at any moment without prior treatment. The scheme is simple, rapid and versatile and has been satisfactorily applied to the concurrent determination of S2- and CN- (and pH) and of NO2- and CN- (and pH). The NO2- determination is the most selective, S2- being the most significant interfering species; NO2- also interferes in the determination of S2-
Cyanide
Nitrite
pH
Sulfide
Waste
Waste
Interferences
Process control
Reverse
