Effects of Deaeration Methods on Dissolution Testing in Aqueous Media: A Study Using a Total Dissolved Gas Pressure Meter**Opinions expressed in this report are those of the authors and do not necessarily reflect the views or policies of the FDA.

2006 ◽  
Vol 95 (7) ◽  
pp. 1606-1613 ◽  
Author(s):  
Zongming Gao ◽  
Terry W. Moore ◽  
William H. Doub ◽  
B.J. Westenberger ◽  
Lucinda F. Buhse
Keyword(s):  
Aqueous Media ◽  
Gas Pressure ◽  
Dissolution Testing ◽  
Dissolved Gas ◽  
Total Dissolved Gas ◽  
Pressure Meter

Applications of a Total Dissolved Gas Pressure Probe in Ground Water Studies

Ground Water ◽  
2003 ◽  
Vol 41 (4) ◽  
pp. 440-448 ◽  
Author(s):  
Andrew H. Manning ◽  
D. Solomon ◽  
Amy L Sheldon
Keyword(s):  
Ground Water ◽  
Gas Pressure ◽  
Pressure Probe ◽  
Dissolved Gas ◽  
Total Dissolved Gas

Contemporary total dissolved gas pressure and soil temperature anomalies recorded at Stromboli volcano (Italy)

2007 ◽  
Vol 34 (8) ◽  
Author(s):  
Sofia De Gregorio ◽  
Paolo Madonia ◽  
Sergio Gurrieri ◽  
Gaetano Giudice ◽  
Salvatore Inguaggiato
Keyword(s):  
Soil Temperature ◽  
Gas Pressure ◽  
Stromboli Volcano ◽  
Dissolved Gas ◽  
Total Dissolved Gas ◽  
Temperature Anomalies

Understanding gas bubble trauma in an era of hydropower expansion: how do fish compensate at depth?

2020 ◽  
Vol 77 (3) ◽  
pp. 556-563 ◽  
Author(s):  
Naomi K. Pleizier ◽  
Charlotte Nelson ◽  
Steven J. Cooke ◽  
Colin J. Brauner
Keyword(s):  
Bubble Growth ◽  
Gas Bubble ◽  
Hydroelectric Dams ◽  
Dissolved Gas ◽  
Empirical Relationships ◽  
Lethal Effects ◽  
Exposed Fish ◽  
Total Dissolved Gas ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
The Relationship

Hydrostatic pressure is known to protect fish from damage by total dissolved gas (TDG) supersaturation, but empirical relationships are lacking. In this study we demonstrate the relationship between depth, TDG, and gas bubble trauma (GBT). Hydroelectric dams generate TDG supersaturation that causes bubble growth in the tissues of aquatic animals, resulting in sublethal and lethal effects. We exposed fish to 100%, 115%, 120%, and 130% TDG at 16 and 63 cm of depth and recorded time to 50% loss of equilibrium and sublethal symptoms. Our linear model of the log-transformed time to 50% LOE (R2 = 0.94) was improved by including depth. Based on our model, a depth of 47 cm compensated for the effects of 4.1% (±1.3% SE) TDG supersaturation. Our experiment reveals that once the surface threshold for GBT from TDG supersaturation is known, depth protects rainbow trout (Oncorhynchus mykiss) from GBT by 9.7% TDG supersaturation per metre depth. Our results can be used to estimate the impacts of TDG on fish downstream of dams and to develop improved guidelines for TDG.

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