Lab #5: Dissolved Oxygen Lab Be sure to read and understand the below instructions BEFORE the lab! Experiment 1: Investigating the Effect of Temperature and Salinity on the Concentration of Dissolved Oxygen in Water Introduction: In an aquatic environment‚ oxygen must be in a solution in a free state (O2) before it is available for use by organisms (bio-available). Its concentration and distribution in the aquatic environment are directly dependent on chemical and physical factors and are
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Dissolved Oxygen and Aquatic Primary Productivity Lab AP Biology Procedure: 1) Have two containers ready‚ one with ice water a little bit above freezing‚ and the other with hot water just below the boiling point. 2) Fill three bottles with the lake water provided‚ trying to have as little duck weed as possible in them. 3) Put one of the bottles in the cold container‚ and one in the hot‚ leave the other at room temperature. 4) Using the testing equipment‚ measure the dissolved oxygen level of
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Title: Laboratory 2: Measurement of Biochemical Oxygen Demand (BOD) Objective To determine the amount of oxygen necessary for biological oxidation of wastewater effluent and determine the amount of oxygen required by bacteria while stabilizing decomposable organic matter. Methodology Apparatus ; Biochemical Oxygen Demand (BOD) meter‚ Dissolved Oxygen bottle (DO bottle)‚ pipette‚ Teflon tape‚ dilution water‚ incubator machine. Procedure; Add 300 ml dilute water then take DO reading immediately
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EXPERIMENT 11: DETERMINATION OF DISSOLVED OXYGEN IN A WATER SAMPLE (WINKLER METHOD) INTRODUCTION In an alkaline solution‚ dissolved oxygen will oxidize manganese(II) to the trivalent state. 8OH-(aq) + 4Mn2+(aq) + 2H2O(l) －－＞ 4Mn(OH)3(s) The analysis is completed by titrating the iodine produced from potassium iodide by manganese(III) hydroxide. 2Mn(OH)3(s) + 2I-(aq) + 6 H+(aq) －－＞ 2Mn2+(aq) + I2(aq) + 6H2O(l) Sodium thiosulphate is used as the titrant. Success of the method is critically
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anihC tsaE eht ni aixopyH Accepted Manuscript Author manuscript‚ published in "Marine Environmental Research 64‚ 4 (2007) 399" DOI : 10.1016/j.marenvres.2007.01.007 ACCEPTED MANUSCRIPT Hypoxia in the East China Sea: one of the largest coastal low-oxygen areas in the world Chung-Chi Chen1‚ *‚ Gwo-Ching Gong2 ‚ Fuh-Kwo Shiah2‚ 3 Deparment of Life Science National Taiwan Normal University 88‚ Sec. 4‚ Ting-Chou Road Taipei 11677‚ Taiwan. 2 1 peer-00562971‚ version 1 - 4 Feb 2011 Institute of Marine
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Title: Amount of Oxygen‚ Mung Beans (Vigna Radiata) Consume during Cellular Respiration Introduction: Cellular respiration is a catabolic reaction that refers to the process of converting chemical energy of organic molecules into a simplify form so it can be used immediately by organism. Glucose may be oxidized completely if sufficient oxygen is available‚ by the following equation: C6H12O6 + 36 ADP + 36Pi + 6O2(g) 6 H2O + 6 CO2(g) + 38 ATP + heat All organisms‚ including plants and animals
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Joseph Priestley Joseph Priestley was chemist who discovered oxygen which the most important air in our life. He was one of the most influential chemists in eighteenth century. He was born in 1733. He was born in Birstall‚ West Yorkshire. His family was successful wool-cloth maker. He lived with his grandmother‚ but he could not live with his mom. He came back to home after his mom died. He suffered from his serious ill. He had good education in language‚ history‚ and education. He was awarded for
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100 180 100 100 100 Modifications The results from my preliminary experiment show that 100 cm3 of oxygen has been produced in the first 30 seconds.. This reaction is far too quick and will prevent me from analysing the effects different substrate concentrations have on enzymes if I decide to continue. I will therefore lower my yeast concentration to 1%. I will also measure the volume of oxygen produced every 15 seconds‚ instead of every 30 seconds. This will make my results more reliable and allow
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Discussion Report 9: Redox Titration: Winkler Method for Dissolved Oxygen Determination The three main objectives of the experiment are to (1) determine dissolved oxygen (DO) in water using the classical method (redox titration)‚ (2) discuss the chemistry behind the Winkler method for DO analysis and (3) describe the sampling technique for the analysis of DO in water sample. In the Winkler method‚ or Iodometry‚ the dissolved oxygen is made to react with Iodide ion to yield Iodine which will be titrated
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Oxygen (O) Human beings obtain this element from the air. It enters a person’s bloodstream through the lungs. The blood carries oxygen to the cells of the body. In the cells‚ oxygen combines with chemicals obtained from food. Energy produced during this process makes it possible for each cell to perform its function in the body. Also‚ oxygen atoms are present in water and water is essential to all life. It is present in many organic compounds. While oxygen is necessary for life‚ oxygen as ozone
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