An example of functional relationship fitting in analytical science. Comment on ‘Modification of Winkler's method for determination of dissolved oxygen concentration in small sample volumes’ by A. Shriwastav, G. Sudarsan, P. Bose and V. Tare

2011 ◽  
Vol 3 (5) ◽  
pp. 1060 ◽  
Author(s):  
Michael Thompson
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Functional Relationship ◽  
Small Sample ◽  
Dissolved Oxygen Concentration ◽  
Analytical Science ◽  
Fitting In

Modification of Winkler's method for determination of dissolved oxygen concentration in small sample volumes

2010 ◽  
Vol 2 (10) ◽  
pp. 1618 ◽  
Author(s):  
Amritanshu Shriwastav ◽  
Guttapati Sudarsan ◽  
Purnendu Bose ◽  
Vinod Tare
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Small Sample ◽  
Dissolved Oxygen Concentration

Spectrophotometric Determination of Dissolved Oxygen Concentration in Water

1974 ◽  
Vol 31 (9) ◽  
pp. 1529-1530 ◽  
Author(s):  
W. S. Duval ◽  
P. J. Brockington ◽  
M. S. von Melville ◽  
G. H. Geen
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Spectrophotometric Determination ◽  
Iodine Concentration ◽  
Colorimetric Determination ◽  
Dissolved Oxygen Concentration ◽  
Winkler Method ◽  
Time Required

A modification of the Winkler method which increases precision while decreasing time required for oxygen analysis is described. The technique involves colorimetric determination of liberated iodine concentration at 287.5 nm.

The Determination of Dissolved Oxygen Concentration in Stationary Water

2013 ◽  
Vol 436 ◽  
pp. 233-237 ◽  
Author(s):  
Ionela Mihaela Căluşaru ◽  
Nicolae Băran ◽  
Adrian Costache
Keyword(s):  
Differential Equation ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Experimental Tests ◽  
Laboratory Measurements ◽  
Dissolved Oxygen Concentration ◽  
Fine Bubble ◽  
Integrated Software ◽  
Theoretical Results

In the paper the differential equation of the transfer speed of the oxygen towards water is numerically integrated, software is written and theoretical results are presented. A setup for experimental tests regarding the functioning of fine bubble generators was designed and built in the frame of the Department of Thermotechnics, Engines, Thermic and Refrigeration Plants laboratory. Measurements regarding the increase of the concentration of oxygen dissolved in water were performed. Theoretical and experimental results were compared.

Effect of Physicochemical Variables on Algal Autoflotation

1992 ◽  
Vol 26 (7-8) ◽  
pp. 1769-1778 ◽  
Author(s):  
S.-I. Lee ◽  
B. Koopman ◽  
E. P. Lincoln
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Retention Time ◽  
Contact Time ◽  
Pilot Scale ◽  
Dissolved Oxygen Concentration ◽  
Physicochemical Variables ◽  
Rise Rate ◽  
Mixing Intensity ◽  
Maximum Rise

Combined chemical flocculation and autoflotation were examined using pilot scale process with chitosan and alum as flocculants. Positive correlation was observed between dissolved oxygen concentration and rise rate. Rise rate depended entirely on the autoflotation parameters: mixing intensity, retention time, and flocculant contact time. Also, rise rate was influenced by the type of flocculant used. The maximum rise rate with alum was observed to be 70 m/h, whereas that with chitosan was approximately 420 m/h. The efficiency of the flocculation-autoflotation process was superior to that of the flocculation-sedimentation process.

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