Determination of the Total Phosphorous Using an Non-Segmented Biphasic Flow (NSBF) Injection

Original Paper

Abstract

The Non-Segmented Biphasic Flow System (NSBF) was applied in total phosphorous determination. The oxidation was performed in a reaction coil heated by electrical resistances. The high efficiency of heating in such system allows the simultaneous formation of liquid and vapor phases without segmentation. This unusual condition has reduced the hydrodynamic pressure and thus providing good work conditions. The system was based on the organic matter oxidation by persulfate in acid medium. The phosphomolybdic acid-green malachite ion-association was spectrophotometrically quantified in 650 nm. The analytical range was from 26.0 μgP.L^-1 to 320 μg P.L^-1 and a limit of detection of 9 μgP.L^-1 was obtained, with an analytical sensitivity of 0.27 L.mg^-1. The analytical frequency was 40 samples per hour with a repeatability of 4.7% (n = 10).