A Simple Photometer for Precise Determination of Dissolved Oxygen Concentration by the Winkler Method with Recommendations for Improving Respiration Rate Measurements in Aquatic Organisms

Estuaries ◽  
1981 ◽  
Vol 4 (1) ◽  
pp. 70 ◽  
Author(s):  
Sandra L. Vargo ◽  
R. Ken Forcé ◽  
R. Ken Force
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Respiration Rate ◽  
Aquatic Organisms ◽  
Precise Determination ◽  
Dissolved Oxygen Concentration ◽  
Winkler Method

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.

Regulation of respiratory activity by oxygen in Arthrobacter fluorescens ammonium-limited chemostat culture

1985 ◽  
Vol 31 (10) ◽  
pp. 896-899 ◽  
Author(s):  
I. Cacciari ◽  
D. Lippi ◽  
S. Ippoliti ◽  
T. Pietrosanti ◽  
W. Pietrosanti
Keyword(s):  
Growth Rate ◽  
Dissolved Oxygen ◽  
Respiratory Rate ◽  
Oxygen Concentration ◽  
Respiration Rate ◽  
Inverse Relationship ◽  
Respiratory Activity ◽  
Chemostat Culture ◽  
Oxygen Limitation ◽  
Dissolved Oxygen Concentration

The effect of a sudden imposition of either oxygen limitation or over oxygenation on an Arthrobacter sp. ammonium-limited chemostat culture was studied at growth rate of 0.03 h−1. Growth and respiratory activity of the cultures were examined during the transition periods and at both steady-states. Arthrobacter fluorescens responded to oxygen limitation by increasing respiratory rate and degrading polysaccharide content. In contrast, an increase in dissolved oxygen concentration caused a decrease in respiration rate and an increase in biosynthesis of endogenous polysaccharides. Under both conditions an inverse relationship seemed to occur between respiration rate and yield coefficients.

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.

Estimation of Whole Pond Respiration Rate

1990 ◽  
Vol 47 (4) ◽  
pp. 682-686 ◽  
Author(s):  
Charles P. Madenjian ◽  
Gary L. Rogers ◽  
Arlo W. Fast
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Respiration Rate ◽  
Tangent Line ◽  
New Method ◽  
Dissolved Oxygen Concentration ◽  
Rate Estimation ◽  
Quadratic Curve ◽  
Tangent Method

A regression application of the whole pond respiration–diffusion (WPRD) model to overnight observations of dissolved oxygen concentration (DO) was introduced as a new method to estimate whole pond respiration rate. A new modification of the Welch procedure was also presented. These two techniques were compared with the tangent method for whole pond respiration rate estimation. The tangent method required fitting a quadratic curve to observed DO; and then calculating the slope of the tangent line to the curve at the time the curve reached 100% saturation of DO. When the quadratic was fitted to DO observed during both day and light, the tangent method often yielded inaccurate estimates of whole pond respiration rate. Estimates by the tangent method were sensitive to the time at which 100% saturation of DO occurred. The WPRD model regression and the modified Welch procedure were recommended to estimate whole pond respiration rate.

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
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