Team+1

Team 1: Kit, Catherine, Emily, Yao So yeah, Lab is due Friday, how would you all want to go about this? -yao


 * Title:** The Effect of Temperature on Dissolved Oxygen


 * Purpose:** To demonstrate the effect of temperature on the concentration of dissolved oxygen.


 * Hypothesis:** If water is at a lower temperature, then there will be a higher concentration of dissolved oxygen. If water is at a higher temperature, then there will be a lower concentration of dissolved oxygen.


 * Materials:**
 * 3 BOD bottles
 * Manganous sulfate
 * Starch indicator
 * Sulfamic acid and measuring spoon
 * Alkaline potassium iodide azide
 * Sodium thiosulfate
 * 2 titration syringes
 * 2 20-mL sampling vials
 * Waterproof marker
 * Thermometer
 * 60-mL syringe with tubing attached


 * Methods**: Please Refer to "AP Biology Laboratory 12: Dissolved Oxygen and Aquatic Primary Productivity" Activity A Procedure.

Dissolved Oxygen at Different Temperatures (mg DO/L) || Group % Saturation || Graph can't be shown
 * Data:**
 * Temperature || Group DO
 * 10 || 10.3 || 92 ||
 * 20 || 7.9 || 85 ||
 * 32 || 6.8 || 90 ||

From the Data provided, it is shown that 10° C water is capable of containing 10.3 mg DO/L or 10.3 ppm. This shows a 92% saturation rate for 10° C water. For 20° C water, 7.9 ppm shown at a 85% saturation. 32° C water show 6.8 ppm at 90% saturantion. The optimum temperature to contain the most dissolved oxygen proves to be the 10° C water. There seems to be no trend since 20° decreased in saturation %, but 32° increase in saturation %. Although there is a fluctuation, the data still indicates that the 10° C water still maintain the highest amount of DO.
 * Analysis:**

Since the water sample at a lower temperature contain the most dissolved oxygen, then this approves the hypothesis. Although this experiment may need to be repeated due to fluctuations at higher temperatures.
 * Conclusion:**


 * Title:** The Effect of Light on Productivity of Chlorella


 * Purpose:** To determine the primary productivity of chlorella through the use of different light intensities.


 * Hypothesis**: If an algae culture is exposed to the most light, then the culture will provide the most gross productivity. If an algae culture is exposed to no light, then the culture will produce the least gross productivity.


 * Materials:**
 * 7 BOD bottles
 * Chlorella culture
 * Manganous sulfate
 * Starch indicator
 * Sulfamic acid
 * Alkaline potassium iodide azide
 * Sodium thiosulfate
 * 2 Titration syringes
 * 2 20-mL Sampling vials
 * 17 fiberglass screens
 * Aluminum foil

Please Refer to "AP Biology Laboratory 12: Dissolved Oxygen and Aquatic Primary Productivity" Activity B Procedure.
 * Methods: **


 * Data: **
 * Bottle || DO || Net Productivity || Gross Productivity ||
 * Baseline(Initial) || 10.9 ||  ||   ||
 * Dark || 0 ||  ||   ||
 * Light(0 screen) || 13.5 || 2.6 || 13.5 ||
 * 1 screen || 6.3 || -4.6 || 6.3 ||
 * 3 screens ||  ||   ||   ||
 * 5 screens || 0.7 || -10.2 || 0.7 ||
 * 8 screens || 0 || -10.9 || 0 ||

From the Data, it is shown that the sample that has no screening provided the most gross productivity. It is also shown the sample with the most screening, and the most darkness, provided a gross productivity of 0, the lowest of all the other samples. There also seem to be a trend that as more screens are placed on the samples, a decrease in gross productivity is shown. When there is more screening, less light is able to penetrate and reach the algae chlorella to activate/continue photosynthesis, which also means less oxygen in the water as a byproduct. This simulates the photosynthetic organisms and their photosynthetic rates and productivity at different depths of a pond.
 * Analysis:**

Since there seem to be a pattern that more light yields more productivity, then this supports the hypothesis.
 * Conclusion:**