Lab # 12abc - Akshay Patel Period 1 Lab#12 The Effect of...

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Akshay Patel 05/04/10 Period 1 Lab #12: The Effect of Temperature, Salinity, and Light Intensity on Dissolved Oxygen Concentration in Water. Abstract: The objective of this lab was to analyze the effect of different types of water such as different temperatures or salinity on the dissolved water concentration of the water and the effect of different amounts of light entering a jar of pond water on the water’s dissolved water concentration. From the information that was known, it can be inferred that if the temperature of the water is lower, then the dissolved oxygen concentration of the water should increase and if the salt concentration of the water is increased, then the dissolved oxygen concentration of the water should decrease for the first part and if there is a decrease in light entering the jar, then the concentration of dissolved oxygen will decrease which leads to decreased productivity for the second part. The hypothesis should be supported from the data found. It was found that salt decreased the dissolved oxygen concentration in the water in both the group and class data and that ice increased the dissolved oxygen concentration in the water in only the group data but not in the class data. It was also found that as light intensity decreases, then there is less dissolved oxygen, which then decreases primary productivity. Introduction: In this lab, the amount of oxygen dissolved in water samples are being measured. Also, samples of pond water are going to be used to determine the primary productivity of the sample. Oxygen is necessary for cellular respiration in organisms. In aquatic environments, oxygen must be in a free state (O 2 ). There are many factors that can influence the availability of oxygen (Pack 274). Some factors are temperature, salinity, photosynthesis, and respiration. The dissolved oxygen concentration decrease when there is an increase in temperature, salt concentrations, and respiration. Respiration decreased oxygen concentration since it consumes the oxygen available. When there is an increase in photosynthesis, there is increased in oxygen concentration since oxygen is produced. The Winker method is used to measure the concentration of dissolved oxygen in this experiment. The Winker method is done through titration. Titration is the process of adding a substance of known concentration to a solution that contains a substance of unknown concentration until reactions occurs. A starch indictor is used since the reaction is photosynthesis and sugars are formed. The primary productivity of a community is a measure of the amount of biomass created by autotrophs by photosynthesis or chemosynthesis per unit of time (Pack 274). It can be determined by measuring the rate at which CO 2 is consumed, O 2 is produced, or biomass is stored. Gross primary productivity is the rate at which producers acquire energy before it is used.
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