Water quality testing
1 / 16

Water Quality Testing - PowerPoint PPT Presentation

  • Uploaded on

Water Quality Testing. Ms. DC and Ms. Arya. What should we test our water for??. What is Turbidity?. Measurement of how clear the water is Unclear water is said to be “turbid.” Turbidity is caused by matter such as clay, silt, and other material in the water

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Water Quality Testing' - ronia

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Water quality testing

Water Quality Testing

Ms. DC and Ms. Arya

What is turbidity
What is Turbidity?

  • Measurement of how clear the water is

  • Unclear water is said to be “turbid.”

  • Turbidity is caused by matter such as clay, silt, and other material in the water

  • Could be the result of soil erosion, run-off, and algal blooms

Test your water turbidity
Test Your Water Turbidity

1. Pour 25 mL of water into the turbidity beaker.

2. Use the Secchi disk to measure turbidity

What are phosphates
What are Phosphates?

  • Phosphates come from phosphorus, a plant nutrient

  • Frequently found in run-off from construction

  • Used as a fertilizer for landscaping


  • Can cause algal blooms which remove oxygen from the water

  • Over HALF of all phosphates in water come from household detergents

Testing your water for phosphates
Testing Your Water for Phosphates

1. Using the 25 mL from turbidity testing, pour 5 mL into a test tube.

2. Add one Phosphorus TesTab.

3. Cap the tube and mix until tablet dissolves.

Wait for 5 minutes.

What are nitrates
What are nitrates?

  • Nitrates come from nitrogen, a nutrient that helps plants grow

  • High levels of nitrates cause aquatic plant and algal blooms which remove oxygen from water

  • Unpolluted waters usually contain about 4 parts per million of nitrates

  • Above 40 parts per million is unsafe for drinking


  • Nitrates get into our watershed by

    • Human and Animal wastes

    • Decomposing organic matter

      • (matter that was once living breaking down)

    • Lawn and crop fertilizer run-off

Test your water for nitrates
Test Your Water for Nitrates

1. Using the water from the turbidity experiment, pour 5 mL of water into a clean test tube

2. Add one Nitrate #1 TesTab. Cap the tube and mix until tablet dissolves

3. Add one Nitrate #2 CTA TesTab. Cap tube and mix.

4. Wait 5 minutes.

What is dissolved oxygen
What is Dissolved Oxygen?

  • Just like animals on land, aquatic animals need oxygen to live

  • Oxygen is dissolved in the water

  • Algal blooms use up all the oxygen leaving little for the animals in the water

Testing your water for dissolved oxygen
Testing Your Water for Dissolved Oxygen

1. Pour 5 mL of water into the test tube.

2. Put one TesTab into the tube and dissolve the tablet.

3. Compare the color the water turns to the chart.

What is ph
What is pH?

  • One of the most common water tests

  • Results tell you how basic or acidic the water is

  • A pH range of 6.5 to 8.2 is healthy for most organisms

  • Blue Crabs need a pH of 8.0

  • Rapidly growing algae can increase the pH of water

Measure your water s ph
Measure Your Water’s pH

1. Pour 10 mL from the turbidity experiment into a test tube

2. Add one pH Wide Range TesTab

3. Cap the tube and mix until the tablet is dissolves.

4. Compare to color chart.

Coliform testing
Coliform Testing

  • Coliform is a group of bacteria that is commonly found in animal feces

  • High coliform amounts can result in disease in aquatic animals as well as people swimming in that water

Testing your water for coliform
Testing Your Water for Coliform

  • Write your name on your nutrient agar plate

  • Dip a sterile swab into your water

  • Streak your nutrient agar plate

  • Put your plate in the middle of the table

  • Ms. DC will put your plate in an incubator (37°C) overnight. You will look at your plates tomorrow.