scholarly journals Determination of Changes of the Dissolved Oxygen Content after Silicon Deoxidation by the Use of the Radioactive Silicon

1976 ◽  
Vol 62 (9) ◽  
pp. 1189-1198 ◽  
Author(s):  
Rokuro SAKAGAMI ◽  
Takashi SASAI
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Content

scholarly journals A Collecting Bottle Especially Adapted for the Quantitative and Qualitative Determination of Dissolved Gasses, Particularly Very Small Quantities of Oxygen

1918 ◽  
Vol 11 (1-10) ◽  
pp. 577-578
Author(s):  
Edwin Powers
Keyword(s):  
Dissolved Oxygen ◽  
Recent Work ◽  
Oxygen Content ◽  
Potassium Iodide ◽  
Free Water ◽  
Sources Of Error ◽  
Winkler Method ◽  
Source Of Error ◽  
Qualitative Determination

One of the sources of error in the Winkler method for the determination of dissolved oxygen in water, especially where the oxygen content is low, is the diffusion of oxygen into the water before and during the introduction of the chemicals. Another source of error is the mixing of the manganous chloride with the potassium iodide-alkali solution at the surface of the water, the chemicals adhering to the pipettes introducing these reagents having washed off at the topof the bottle, where they react with the oxygen present. In recent work involving the oxygen-free water apparatus described by Shelford in the preceding article of this volume, it was found especially desirable to eliminate the above sources of error. This was accomplished by a special bottle which allows the collecting of samples and the introduction of the chemicals without exposing the samples to air during the operation.

Complementary Methods for the Determination of Dissolved Oxygen Content in Perfluorocarbon Emulsions and Other Solutions

2011 ◽  
Vol 115 (35) ◽  
pp. 10547-10552 ◽  
Author(s):  
Christopher A. Fraker ◽  
Armando J. Mendez ◽  
Cherie L. Stabler
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Content ◽  
Complementary Methods

The Oxygen Supply to Salmon Eggs in Spawning Beds

1954 ◽  
Vol 11 (6) ◽  
pp. 933-953 ◽  
Author(s):  
W. Percy Wickett
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Content ◽  
Oxygen Demand ◽  
Subsurface Water ◽  
Flow Section ◽  
Apparent Velocity ◽  
Low Oxygen ◽  
Salmon Eggs ◽  
Controlled Flow

By using standpipes set 12 inches into the stream bottom the oxygen content and apparent velocity of the gravel water in the controlled-flow section of Nile Creek were observed. Values of dissolved oxygen content and velocity that just supply the full oxygen demand of salmon eggs were defined. The high mortalities of chum salmon eggs in the pre-eyed stage, that have been found in certain areas, may be explained on the basis that oxygen demands of 0.00013 to 0.0003 mg./egg/hr. at temperatures of 0.1° to 8.2 °C. were not being met, owing to very low oxygen content or very low apparent velocity of the water in the gravel. Values as low as 0.2 p.p.m. and 2 mm./hr. were recorded. A portable gravel-water sampler is described, which can be used (1) to obtain samples of subsurface water for the determination of dissolved oxygen; and (2) to calculate apparent velocity of gravel water from rate of dilution of an added dye.

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