Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
24 Cards in this Set
- Front
- Back
|
Water quality
|
the chemical, physical, and biological characteristics of water, usually in respect to its suitability for a particular use
|
|
|
point source
|
an identifiable source where pollutants are discharged such as a large petrochemical facility, a feedlot, or the effluent pipe from a wastewater treatment plant
|
|
|
non-point source
|
non-point source refers to pollutants that do not have a specific point of origin or are disperse such as runoff from crops and urban areas
|
|
|
Air pollution is a major _____ source of pollution
|
non-point source
|
|
|
thermal pollution
|
Some industries withdraw water from a water body or stream and use it to cool down the facility or process and then return the water back to the water body or stream, essentially adding heat to the water. This is called <b>thermal pollution</b>
|
|
|
dissolved oxygen (DO)
|
a measure of the amount of gaseous oxygen (O2) dissolved in water.
DO concentrations are usually expressed as mg/L or as percent saturation |
|
|
True or False:
the oxygen required for aquatic organisms to survive must be dissolved in the water body as a product of photosynthesis from the aquatic plants and algae, by aeration of the water, or by diffusion from the surrounding air. |
True
|
|
|
When are DO levels usually at their lowest?
|
just before dawn
|
|
|
True or False:
DO levels are lower in the winter |
False.
DO levels are lower in the summer since warmer water holds less oxygen than cooler water |
|
|
biochemical oxygen demand
|
the amount of oxygen required to decompose a specific organic material
|
|
|
Acids have an excess of _____ ions and have a pH of ____ than 7
|
Acids have an excess of <b>hydrogen</b> ions (H+) and have a pH of <b>less</b> than 7
|
|
|
The lower the pH the more ____ something is
|
acidic
|
|
|
Bases have excess ______ ions and have a pH of _______ than 7
|
Bases have excess <b>hydroxide/hydroxyl</b> ions (OH-) and have a pH of <b>greater</b> than 7
|
|
|
____ is a neutral pH
|
7
|
|
|
What is pH?
|
a measure of how acidic or basic something is
|
|
|
True or False:
Most fish can tolerate pH values of about 5.0 to 9.0 |
True
|
|
|
Turbidity
|
a measure of the clarity or clearness of water
|
|
|
How is turbidity measured?
|
Turbidity is measured by passing a beam of light through the water and seeing how much light is reflected off particles (suspended materials) in the water
|
|
|
True or False:
The lower the turbidity, the cloudier the water is |
False.
The <b>higher</b> the turbidity, the cloudier the water is |
|
|
Turbidity is measured in ______ units
|
Turbidity is measured in <b>nephelometric turbidity units</b>
|
|
|
Specific conductance
|
Specific conductance, also called conductance or electrical conductivity, is a measure of how well water can conduct an electrical current. Pure water, such as distilled water, will have a very low specific conductance and seawater will have a high specific conductance. The basic unit of measurement for specific conductance is siemen
|
|
|
Sewage is a major source of _____ in water since it is a decomposition product from urea and protein.
|
ammonia (NH3)
|
|
|
True or False:
Ammonia may be toxic to fish and aquatic organisms, even in very low concentrations |
True
|
|
|
True or False:
Ammonia levels less than approximately 0.1 mg/L usually indicate polluted waters |
False.
Ammonia levels greater than approximately 0.1 mg/L usually indicate polluted waters |
