UW-Madison ZOO 315 - Overview of water chemistry (5 pages)

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Overview of water chemistry



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Overview of water chemistry

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Lecture Notes


Pages:
5
School:
University of Wisconsin, Madison
Course:
Zoo 315 - Limnology

Unformatted text preview:

ZOO 315 Limnology Overview of water chemistry Jake Vander Zanden Sept 18 2008 1 Water chemistry basics Significance of water chemistry physical aspects influence on biota overall water quality Water is a good solvent Contains Major ions Cations Ca2 Mg2 Na K Anions HCO3 CO3 2 SO4 2 ClNutrients Macronutrients N P Si Micronutrients Fe Mn Dissolved gasses CO2 O2 Others Units and measurement Concentration amount per unit of water Often easiest to make measurements to determine total amount of ions Salinity total concentration of Conductivity ease with which an electric current passes between 2 electrodes Total dissolved solids TDS weight of sample after evaporation Hardness Content of 2 Dissolved ions Typical ionic composition of inland waters Where do dissolved ions come from Watershed Weathering Different rock types Weathering rates Products Left long term increases in baseline concentration of chloride for streams and rivers of the northeastern United States 3 pH and acid deposition Atmospheric sources of acidity pH activity of dissolved H ions pH range of natural waters examples of naturally acidic waters Acid deposition Acid mine drainage Alkaline waters Soda lakes Endorheic basins 4 Nutrients Nutrient Biogeochemistry Phosphorus Element that limits lake productivity Lake Eutrophication 5 Dissolved gasses O2 CO2 6CO2 6H2O C6H12O6 6O2 Exchange with atmosphere Photosynthesis P Respiration R Diurnal changes in dissolved gasses O2 depth profiles Case study Jack s lake ON



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