...E.S. Snavely, Jr. A relatively simple apparatus was used to measure the rate of reaction of dissolved oxygen with hydrogen sulfide and with added chemical scavengers in oilfield waters. Results show that natural waters may catalyze or retard the reaction of sulfur dioxide or sodium sulfite...

.... The chemical most commonly used at that time was sodium sulfite (Na2SO3). Stoichiometric combination of sodium sulfite with oxygen requires 8 lb/lb. To make the reaction approach completion requires both a catalyst, such as cobaltous chloride, and an excess of sulfite, usually 10 ppm. To remove 10 ppm...