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Conducting Water Quality Tests

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Conducting Water Quality Tests Next Generation Science / Common Core Standards Addressed! HS ESS2 5. Plan and conduct an investigation of the properties of water ... – PowerPoint PPT presentation

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Title: Conducting Water Quality Tests


1
Conducting Water Quality Tests
2
Next Generation Science / Common Core Standards
Addressed!
  • HS-ESS2-5. Plan and conduct an investigation of
    the properties of water and its effects on Earth
    materials and surface processes. Clarification
    Statement Emphasis is on mechanical and chemical
    investigations with water and a variety of solid
    materials to provide the evidence for connections
    between the hydrologic cycle and system
    interactions commonly known as the rock cycle.
    Examples of mechanical investigations include
    stream transportation and deposition using a
    stream table, erosion using variations in soil
    moisture content, or frost wedging by the
    expansion of water as it freezes. Examples of
    chemical investigations include chemical
    weathering and recrystallization (by testing the
    solubility of different materials) or melt
    generation (by examining how water lowers the
    melting temperature of most solids).

3
Bell Work / Learning Objectives
  • Define water quality monitoring.
  • Identify types of physical monitoring.
  • Explain water testing.

4
Terms
  • Biological engineering
  • Visual monitoring
  • Water quality monitoring

5
Water Quality
  • What does water quality mean to you?
  • What makes one sample of water better than
    another?
  • How can you be sure of the quality of the water
    you are using?

6
Water Quality Monitoring
  • The studying of water to detect changes in its
    quality.
  • The physical, chemical, and biological make-up of
    the water source should be monitored regularly.
  • Regular monitoring will help determine what
    changes are taking place and how to stop these
    changes or make other corrective measures.

7
Water Quality Monitoring
  • Water testing can be done by the landowner, by a
    lab, or by private testing companies.

8
Physical Monitoring
  • Includes the visual and other physical
    observations of the water.
  • Monitoring the odor of the water source and the
    course and any changes in the course of the water
    source are also examples of physical monitoring.

9
(No Transcript)
10
Visual Monitoring
  • Determining changes in water by looking at it.
  • These changes may be in the color or the presence
    of sediment or other materials.

11
Changes in Color
  • May result from the presence of algae or
    bacteria.

12
Foam Forming
  • Would indicate the presence of decomposition.

13
Observation of Dead Animals
  • Could also be considered visual monitoring.

14
Test for Odors
  • The odor of rotten eggs would indicate high
    levels of sulfur.
  • Sewage and chlorine are other obvious odors that
    would result from sources of pollution in the
    water.

15
Change of Course
  • A change of the water course source is usually
    due to erosion.
  • These changes may cause adverse affects to the
    water supply.
  • One way to prevent changes in course is
    biological engineering.
  • Biological engineering is using plants to
    stabilize creek or stream banks.

16
Water Testing
  • Can be done for a couple dollars or a couple
    hundred dollars.
  • The type and extent of the testing will determine
    the overall cost.
  • Examples of different water tests that can be
    conducted include hardness, dissolved gases,
    nitrates and nitrites, pH and acidity.

17
Hardness of Water
  • Reported in parts per million (ppm).
  • Less than 100 ppm is most desirable.
  • Water with 250 ppm or more are considered hard
    and requires treatment.

18
Dissolved Gases
  • Carbon dioxide and hydrogen sulfide present in a
    water sample can result in a fowl odor or taste.
  • They can be tested for, but results are not
    usually reported unless the odor and taste of the
    water becomes objectionable.

19
Nitrates and nitrites
  • Present in the water when organic matter begins
    to break down.
  • Nitrate levels above 10 milligrams per liter
    indicate contamination.
  • Nitrite levels above 0.0005 milligrams per liter
    indicate contamination.

20
Water pH
  • The acidity of water refers to the pH level.
  • Water with a pH of less than 7.0 is acidic and
    can be harmful to plumbing fixtures.
  • Water can also be discolored when the pH is too
    low.

21
Review / Summary
  • Define water quality monitoring.
  • Identify types of physical monitoring.
  • Explain water testing.

22
The End!
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