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LE2 Coastal > Dissolved Oxygen > Flashcards

Dissolved Oxygen Flashcards

1
Q

True/False

Higher DO indicates better water quality

A

True

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2
Q

It is characterized by the presence of DO. “Aerobic
” is also used to describe biological or chemical processes that occur in the
presence of oxygen.

A

Aerobic (oxic)

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3
Q

It is n environmental condition in which the concentration of DO is
low enough to have biological effects. According to the USEPA (2000b), water with oxygen concentrations of 2mg/L or less is of concern.

A

Hypoxia

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4
Q

It is used to
describe biological or chemical processes that occur in the absence of

A

Anaerobic (anoxic)

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5
Q

It is a DO level concentration that can suffocate sport fishes.

A

3-4 mg/L

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6
Q

Large and juvenile fish require higher DO
concentration, ranging from

A

5-8 mg/L

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7
Q

True/False

Adequate dissolved oxygen is necessary for good water
quality.

A

True

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8
Q

True /False

A

The energy from sunlight is used to split carbon dioxide and water into oxygen and sugar.

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9
Q

True/False

CO2 + H2O -> O2 + sugar

A

True

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10
Q

A process by which oxygen is transferred across the
atmosphere and waterbody.

A

Reaeration

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11
Q

True/False

Reaeration cannot produce dissolved
oxygen even in night.

A

False (can)

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12
Q

3 Dissolved Oxygen measurement methods

A

Colorimetric
Titrimetric
Polarographic

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13
Q

Best-known titrimetric method

A

Winkler method

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14
Q

It provide for rough
and rapid measurement: they are often used for screening for low-oxygen conditions and can be easily used by non-professional operators.

A

Colorimetric

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15
Q

A method for measuring DO where Chemical reagents added in excess interact with oxygen to form a product, and another chemical (the
“titrant”) is used quantitatively to neutralize that product.

A

Titrimetric

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16
Q

DO method where Electrodes measure the flux of oxygen across a membrane.
Oxygen is consumed in the
process, and the traditional
electrodes require flushing of measured liquid at the
membrane surface to constantly replace the oxygen consumed.

A

Polarographic

17
Q

It indicates the quantity of oxygen used by bacteria and other microorganisms during the aerobic (oxygen-containing) decomposition
of organic materials at a particular temperature.

A

Biochemical Oxygen Demand

18
Q

True/False

Higher BOD, more pure water

Lower BOD, more polluted

A

False (interchange description)

19
Q

True/False

Low concentration of DO in the water indicates contamination.

A

True

20
Q

True/false

The temperature and altitude of the water affect
the DO in a saturated solution.

A

True

21
Q

3 Major sources of DO

A

Reaeration
Photosynthesis
External loads

22
Q

5 Major sinks of DO

A

DOC Oxidation
Nitrification
Respiration
SOD
COD

23
Q

Consumes oxygen to oxidize NH4+ to NO2- and then to NO3-.

A

Nitrification

24
Q

Carbon dioxide and water is converted from organic carbon dioxide in the presence of oxygen

A

Respiration

25
Q

Represents oxygen depletion caused by benthic reactions. It it the rate of oxygen consumption exerted by the bottom sediment to the overlying water.

A

SOD

26
Q

Chemicals such as Sulfide and Methane give rise to more oxygen demand. Stratification may intercept the DO from the surface to reach at the bottom.

A

COD

27
Q

This model takes into account the DO contribution in the reaeration process as well as the consumption of DO by aerobic bacteria that oxidize organic materials.

A

DO Kinetic Equation

28
Q

Used to show how surface waters’ dissolved oxygen is
affected by sewage and organic pollutants such as soils, sediments, garbage, sludg

A

BOD5 Test

29
Q

An examination designed to
quantify the oxygen needed for the chemical oxidation of both organic matter and inorganic nutrients like Ammonia or Nitrate found in water.

A

COD

30
Q

True/False

Higher COD, more polluted

A

True

31
Q

3 Factors Affecting DO

A

Water temperature
Salinity
Pressure

32
Q

True/False

Cooler water has a
greater capacity to retain dissolved oxygen compared to
warmer water.

A

True

33
Q

True/False

Water with higher salinity retains a lower amount of oxygen compared to freshwater.

A

True

34
Q

True/False

Lowering the salt concentration results in a reduction in the solubility of oxygen.

A

False (Raising)

35
Q

True/False

Lower atmospheric pressure enables bodies of water to retain increased levels of dissolved oxygen.

A

False (Greater)

LE2 Coastal (3 decks)

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