Polarographic Determination of Dissolved Oxygen in Dilute Sulfite Waste Liquor

Abstract

Dissolved oxygen measurements by the Winkler method or its modifications are unreliable in water containing sulfite waste even at low waste concentrations.The

Gas Analysis

“…Polarographic (166), galvanic, and electrochemical (218,264,816) methods for the determination of dissolved oxy'gen have been studied under different conditions. Riedel (243) studied several methods and stated that ASTM method D 888 or proposed Nonreferee A method gave better precision than the starch endpoint titration or the Schwartz-Guerney' B method.…”

Water Analysis

“…It was concluded that both the ASTM referee and nonreferee methods with dead stop end point (8) were superior to the Schwartz-Gurney B method or the starch end point titration. Levine and Williams (154) applied the polarographic method to dilute sulfite waste liquor and found that even low concentrations of waste interfered. By shifting to an acid pH range and operating with a potential of -0.6 volt (against saturated calomel electrode), it was possible to minimize the interferences.…”