DO: Dissolved Oxygen using Winkler method

In AquaAnalytix: Water Quality Analysis

Dissolved Oxygen using Winkler method

Description

Dissolved oxygen (DO) refers to the concentration of oxygen gas incorporated in water. Oxygen enters water by direct absorption from the atmosphere (surface diffusion), which is enhanced by turbulence or oxygen released by aquatic plants and algae during photosynthesis.

Principle of analysis:

In this method a divalent manganese solution, followed by strong alkali, is added to the sample. Any dissolved oxygen rapidly oxidizes an equivalent amount of divalent manganese to basic hydroxides of higher valency states. When the solution is acidified in presence of iodide ions, the oxidized manganese ions again reverts to divalent state and iodine, equivalent to the original dissolved oxygen content of the water, is liberated. This iodine is titrated with standardized thiosulphate solution. APHA(2017,ISBN:9780875532875).

Usage

DO(Vol1, Vol2, N)

Arguments

Vol1	Volume of titrant (mL)
Vol2	Volume of fraction of sample taken for Analysis (mL)
N	Normality of thiosulphate solution

Value

Dissolved Oxygen (in mL/L)

References

APHA, 2017. Standard methods for examination of water and wastewater, 23rd edn. APHA, AWWA, WPCF, Washington

Examples

DO(0.5, 25, 0.039)

AquaAnalytix documentation built on Sept. 11, 2024, 6:17 p.m.