“…The presence of dissolved gases also is suspected,in many cases,of failure to meet apparatus suitability standards (2,5). * Previous studies have demonstrated the use of dissolved oxygen as a measure of deaeration (7)(8)(9)(10),although some indicate that dissolved oxygen alone is not an adequate measure (11) with recommendations that other gases,particularly nitrogen and carbon dioxide, should be measured and controlled as well. In this study, oxygen as well as the total dissolved gas pressure (the sum of the partial pressures of oxygen,nitrogen,argon,carbon dioxide,and other trace gases) was monitored from the time the medium was transferred into the dissolution vessel until the end of the dissolution test.…”