scholarly journals PENENTUAN KADAR OKSIGEN TERLARUT MENGGUNAKAN SENSOR POLAROGRAFI BERMEMBRAN PLASTIK (Determination of dissolved oxygen with polarographic oxygen sensor plastic membrane probe)

2015 ◽  
Vol 2 (1) ◽  
pp. 67
Author(s):  
Hokcu Suhanda
Keyword(s):  
Steady State ◽  
Dissolved Oxygen ◽  
Oxygen Sensor ◽  
Optimum Operating ◽  
Analytical Sensitivity ◽  
Membrane Probe ◽  
Significant Difference ◽  
Winkler Method ◽  
Plastic Membrane

Plastic membrane sensor for polarographic oxygen measurement has been investigated. The Probe was constructed of: Pt as a working electrode; Ag- AgCl as a reference electrode and an auxiliary electrode; solution of KCl as an electrolyte solution; plastic wrap (thickness 72.7  m) as a membrane; and polyester polymer as a body of sensor. It was found that the polarographic oxygen sensor plastic membrane probe was suited for determination of dissolved oxygen with an optimum operating characteristics at applied voltage of  –0.65 V and solution KCl 30% as an electrolyte. The probe showed that reduction current achieved steady state after 75 seconds. The standard calibration curve (concentration – current) showed that the linear relationships were achieved for dissolved oxygen in the range of 1.0 – 30.6 ppm. The analytical performance characteristics of the probe were: precision 0.87% – 30.0 %; calibration sensitivity 0.17 ppm/  A; analytical sensitivity 0.56 – 0.84 ppm/  A; and detection limit 0.8 ppm. The t- test and F-test at 95% confidence level showed that there was no significant difference between the determinations of dissolved oxygen by polarographic oxygen sensor membrane plastic and by Winkler method. Key words: membrane plastic, polarographic, steady state, Winkler method.

Determination of dissolved oxygen: a comparison of some already proposed modifications of the winkler method

1981 ◽  
Vol 16 (3-4) ◽  
pp. 219-221 ◽  
Author(s):  
A. P. P. Toledo ◽  
J. F. Carvalho ◽  
E. S. Miazaki ◽  
J. A. Souza
Keyword(s):  
Dissolved Oxygen ◽  
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.

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.

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