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Quantitative Estimation Of Dissolved Oxygen In Water: A New Approach To The Calculation Methodology Of Winklar’s Method

Author:

Dr. Angsuman Chanda

Subject Area:

Life Sciences

Abstract:

Till date most acceptable method of estimation of dissolved oxygen in water sample is Winklar’s method (APHA-2005). The method of calculation of data is followed by the formula V1x N x E x 1000/ V4 (V2- V3/V2). Where, V1= Quantity of the sample water. V1 = Quantity of sodium thiosulphate used in titration. N = Normality of sodium thiosulphate (N/80). V4 = Quantity of sample taken for titration. V3 = Quantity of alkaline iodite and manganese sulphate. E = Equivalent weight of O2. This formula can not explain a clear picture related to the chemical reaction takes place within the reagents used in this methodology. Therefore, an attempt has been made towards chemical deduction of data, available during estimation.

PDF file:

6470.pdf

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