Indirect determination of oxygen dissolved in water by atomic absorption spectrometry

Summary Indirect Determination of Oxygen Dissolved in Water by Atomic Absorption SpectrometryO₂ dissolved in aqueous medium reacts quantitatively with thallium metal according to O₂+4 Tl+2 H₂O 4 Tl⁺+4 OH^–. The reaction takes place in a glass column filled up with small pieces of sheet metal. The Tl⁺ formed is measured by atomic absorption spectrometry. We study the influence of several factors (pH, temperature, salinity of the water). The results obtained from a statistical sample were compared with those provided by the amperometric method for direct determination of dissolved O₂ and we found a high degree of consistency between them.