Determination of B.O.D. of Sewage and Industrial Wastes with Polarograph

Portable Analyzer for Determination of Dissolved Oxygen in Water. Application of Rapid-Dropping Mercury Portable Analyzer for Determination of Dissolved Oxygen in Water. Application of Rapid-Dropping Mercury Electrode

“…DISCUSSION Application to Effluent Waters. Table II compares values obtained on effluent waters on several successive days to values obtained with a laboratory polarograph by a method similar to that of Busch and Sawj'er (2).…”

“…The method is based upon polarographic reduction of dissolved oxygen (4, 5) at a dropping mercury electrode (with a mercury pool as anode) to produce two reduction waves of equal height. The early wave is said to be due to the reduction of oxygen to hydrogen peroxide O2 +*2H+ + 2e -H2O2 (acidic) (1) O2 4* 2H2O T 2c -H2O2 -j-20H" (neutral or basic) (2) This is a fairly steep wave reducing at a potential of about -0.2 volt. However, it possesses a huge maximum and has a short and shifting plateau.…”

Review - Water Analysis

“…Ippen and Carver (103) compared two polarographic methods, the dropping mercury electrode and the rotating platinum electrode, and concluded that the latter instrument possessed desirable characteristics in freedom from air bubble interference, presentation of a linear record, and superior ruggedness. Busch and Sawyer have presented the results of a study of the use of the dropping mercury electrode instrument in two papers (27,28). The polarographic method was applied to the determination of oxygen in radioactive wastes, as the exposure of personnel to activity is less than in the Winkler method and time requirements are less.…”

Polarographic Determination of Dissolved Oxygen in Dilute Sulfite Waste Liquor

“…Standard tungsten solution, about 1.0 X 10-2M. This solution was made from sodium tungstate and standardized gravimetrically (1).…”