style="font-size:15px;"> 1. To perform the necessary training and the setting of the device (see. Chapter 4);
2. To prepare the workplace, distilled and tap water. To rinse the sensor and detector with distilled water;
3. To lower the detector and the sensor into the solution, stir it to accelerate the achievement of temperature regime. Turn on the device;
4. To turn on the electromechanical mixing device and after 5-7 minutes remove the instrument readings;
5. To measure the temperature of the test sample;
6. To measure the atmospheric pressure;
7. To turn off the electromechanical mixing device.
Task:
1. To measure the oxygen content in distilled water;
2. To measure oxygen content in the distilled water saturated with oxygen in the air for 30 minutes – barbotage;
3. To measure the oxygen content in tap water.
Report design. To make all calculations by all measurements of the oxygen content of the samples taking into the factor of atmospheric pressure, using the formula 4.1 and Table. 4.1. Compare measurement results and make conclusions.
Laboratory work № 8
Amperometric method of determining the rate of respiration of aquatic plants and yeast cells
Objective: To determine the intensity of respiration of aquatic plants, yeast suspension in normal conditions and in the action of various factors.
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