bio155_Lecture_5_Chemistry_intro_pH - BIOE 155 Fall 2009...

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BIOE 155, Fall 2009 OVERVIEW OF CHEMISTRY, SOLUBILITY, pH, REDOX, SALINITY (read 32-37; 231-232 in Dodson) INTRODUCTION TO CHEMISTRY Water is a good solvent of various polar chemicals o Examples of soluble chemicals include: ± Acids, bases, salts, sugars, alcohols. . . o Freshwater studies generally focus on: ± Carbon ± Oxygen ± Nitrogen ± Phosphorus Remember that there is a strong relationship between water temperature and solubility of gases. o Higher temperatures Æ lower dissolved concentrations. o Lower temperature Æ higher dissolved concentrations. Chemicals can be quantified as: ± Mass (gm) ± Mass concentrations (gm/L) ± Molar concentrations (M/L) ± Molar equivalents Chemicals cycle between compartments within freshwaters. This cycling can occur very rapidly (phytoplankton nutrient uptake) or very slowly (rock erosion). o Compartments can be: ± different forms of the chemical ± different reservoirs: Lithosphere—earth/rocks Biota A t m o s p h e r e W a t e r Biogeochemistry —large-scale cycling of chemicals, including living organisms. Term developed by Hutchinson (1944)
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This note was uploaded on 11/06/2009 for the course BIO 155 taught by Professor Moore during the Fall '09 term at UCSC.

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bio155_Lecture_5_Chemistry_intro_pH - BIOE 155 Fall 2009...

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