Pasco PS-2108 Dissolved Oxygen Sensor Manuel d'utilisateur télécharger pdf (Page 27)

Model No. PS-2108 Dissolved Oxygen Sensor

Experiment 5: The Effect Of Respiration On Dissolved

Concentration

Purpose

The purpose of the experiment is to explore the effect of respiration on dissolved O

concentrations.

Materials required

• Dissolved Oxygen Sensor (PS-2108)

• 400 ml deionized water

• PASPort interface hardware and DataStudio software

• aquarium pump or large bottle

• 1 package rapid active yeast

• 600 ml beaker (2)

• table sugar

Optional materials

• hot plate/stir plate and magnetic stir bar

Procedure

1. Follow the directions on the yeast package to activate the

yeast in a beaker using tap water and sugar.

2. Set up and calibrate the Dissolved Oxygen Sensor.

3. Stir 1 teaspoon sugar into the deionized water and

saturate it with air.

4. Monitor the dissolved O

concentrations of the

deionized sugar water while stirring gently with the

dissolved O

probe.

5. When the reading stabilizes, click the Start button in

DataStudio and record data for 30 seconds.

6. After 30 seconds, transfer about 1 teaspoon of the activated yeast solution into the water.

7. Continue stirring with the probe and recording data for about 10 minutes or until the

oxygen level stabilizes.

Figure 1

Transfer activated yeast solution to the

test beaker.

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Pasco PS-2108 Dissolved Oxygen Sensor Manuel d'utilisateur Page 27