Oxygen waves

Dissolved oxygen is readily reduced at various electrodes an aqueous solution saturated with air exhibits two distinct oxygen waves as shown in Figure 23-11. The first results from the reduction of oxygen to peroxide... 

Oxygen wave At the dropping mercury electrode, oxygen produces two waves, the first due to formation of peroxide, the second due to further reduction to water this can be an interference in the determination of other species but is used in the determination of dissolved oxygen. 

Fig. 3. Effect of concentration of bovine superoxide dismutase on oxygen wave at pH 9. 76 in presence of triphenylphosphine oxide. (1) without superoxide dismutase (2) superoxide dismutase = 1.4 x (3) superoxide dismutase =...

The wave of nitrobenzene is situated between the two oxygen waves. 

More serious is the interference by dissolved oxygen which has to be removed diligently as the second oxygen wave is situated under the zinc peak and is the main cause of any irre-producibility of its determination. It is advisable to ensure that the solution is blanketed with a continuous stream of nitrogen during the entire analysis to prevent irreproducibility... 

The height of the prewave increases with increase in the proton concentration, and the heights of both oxygen waves decrease. 

The heights of the first and second oxygen waves on the polarograms are governed by the amount of oxygen which has not entered into reaction with the protons or isocyanates, and the waves for the free oxygen therefore decrease with increase in the concentration of... 

Fig. 9. i-E Curve In 0.1 N sodium hydroxide solution. 1) Beginning of peracetic acid wave 2) beginning of oxygen wave 3) limiting current for peracetic acid. 

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