Question

In a body of fresh water, a dissolved oxygen concentration of 0.262 mm or higher is usually needed to maintain a healthy aquatic ecosystem. for a lake to maintain this concentration, what is the maximum water temperature?

Answer 1

We are given that

DO = 0.262mM O2 

And since 1mM = 32mg/L 

Converting to mg/L:

DO = 32mg/L * 0.262mM

DO =8.4 mg/L = 8.4ppm 

Using the nomograph to identify the maximum temperature to maintain 8.4 ppm of DO concentration:

Max water temp is 26 ˚C .

Answer 2

Analysis of Percent Determination (%) Oxygen Saturation in waters is expressed as percent saturation (Wetzel and Likens, 1991).

%saturation = $\frac{DO}{DOt}$ x 100%

Information :

DO = Dissolved oxygen concentration (mg/l)

DOt = The concentration of dissolved oxygen in theory (mg/l)

Further explanation

Basically the process of decreasing oxygen in water is caused by chemical, physical and biological processes, namely:

• The process of breathing (respiration) both by animals and plants
• The process of decomposition (decomposition) of organic matter
• Reducing bottom waters

The solubility of oxygen into water is mainly influenced by temperature factors. The solubility of oxygen gas at low temperatures is relatively higher.

The limits of tolerance of organisms to oxygen levels depend on the type of organism in water. In general, the minimum oxygen level that supports the life of aquatic organisms is 3-5 ppm. In addition to the process of respiration, oxygen also affects the lives of other organisms, namely:

• Increase the appetite of fish or other aquatic organisms.
• Affects fish health, which at the 12 ppm limit will cause illnesses caused by gas bubble diseases
• Affects physiological function and slow growth of fish, can even cause death
• Influencing the process of decomposition and overhauling the organic material that is at the bottom of the pond

If at the same temperature the concentration of dissolved oxygen is equal to the amount of dissolution of oxygen present in the water, the water can be said to be saturated with dissolved oxygen. If water contains more dissolved oxygen than it should at a certain temperature, it means that the oxygen in the water is over-saturated.

Learn more

The solubility of oxygen https://brainly.com/question/4263359

process of decreasing oxygen in water https://brainly.com/question/4263359

Details

Class: High School

Subjects: Biology

Keywords: Oxygen, Water, Organism