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AP LAB 12

AP LAB 12. Part A – Effect of Temperature on DO (dO 2 ) % Saturation. AP LAB 12. Part B - Effect of Light Availability on DO Primary Productivity Rate of photosynthesis Chlorella sp. Set-up Initial Dark Varying number of screens Calculations Respiration I – D Net Productivity

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AP LAB 12

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  1. AP LAB 12 • Part A – Effect of Temperature on DO (dO2) • % Saturation

  2. AP LAB 12 • Part B - Effect of Light Availability on DO • Primary Productivity • Rate of photosynthesis • Chlorella sp. • Set-up • Initial • Dark • Varying number of screens • Calculations • Respiration • I – D • Net Productivity • L – I • Gross Productivity • Net Productivity + Respiration • (L – I) + (I – D) = L - D

  3. AP LAB 12, cont • Winkler Method • Measures the amount of I2 in solution → proportional to O2 • Fixation Step • O2 oxidizes Mn(OH)2 • Sulfamic acid is added to fix the reaction, form I2 • Titration Step • Starch is used as an indicator to quantify the concentration of I2

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