Respuesta :
The amount of dissolved oxygen- this water quality indicator should be used to determine the acidity level of the river water which get contaminated by the discharge of waste water.
Option: B
Explanation:
Industrial effluents contaminated river water. If a industry located in the bank of the river then all its waste water will go in the river water and will pollute the fresh water. To judge the water quality of river there are several indicators but the amount of dissolved oxygen is the best indicator.
Like eutrophication refers to the rising up of phosphate level of the water which decreases the dissolved oxygen level which is harmful for aquatic life. If the dissolved oxygen level disturbed then biological oxygen demand of the water will increase and will adversely affect aquatic life.
The accumulation of an undesirable and detrimental substance in rivers or water bodies is called water pollution. The treated wastewater release, dumping of wastes etc. are the reason for water pollution and contamination.
To discern the acidity of the river the quantity of dissolved oxygen should be estimated.
Dissolved oxygen can be explained as:
- The amount of oxygen dissolved in water is a parameter to define the acidity and pollution level of water by evaluating and examining the waste released in the water bodies.
- The water gets polluted from the release of effluents from the industries and factories resulting in contamination and pollution.
- The dissolved oxygen (DO) examination is the most suitable indicator for contamination as due to pollutants the dissolved oxygen in the water bodies gets influenced and unbalanced.
- The lower levels of oxygen in the water due to the warm environment increase the hydrogen ion resulting in acidic water quality.
Therefore, option B is correct.
Learn more about dissolved oxygen here:
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