Columbia ENVP U6220 - Introduction to Environmental Chemistry (50 pages)

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Introduction to Environmental Chemistry



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Introduction to Environmental Chemistry

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Lecture Notes


Pages:
50
School:
Columbia University
Course:
Envp U6220 - Environmental Chemistry & Toxicology

Unformatted text preview:

Creative minds have been known to survive any sort of bad training Anna Freud Your theory is crazy but it s not crazy enough to be true Niels Bohr Never express yourself more clearly than you are able to think Niels Bohr U6220 Environmental Chem Tox A Intro to Fate Transport of Environmental contaminants B Basic Chemistry review C Chemical processes Sorption and particulate transport Introduction to Environmental Chemistry Chemical cycling and role of the anthroposphere or anthrosphere Media Aquatic Water as solvent polar Mobility solubility exchange with other phases sorption precipitation volatilization condensation Atmosphere No chemical bonds between individual components in gas phase Partial pressure exchange precipitation volatilization mobility Solids less mobile phase sequestration low bioavailability really Children Interaction with other phases sorption dissolution etc Source and Fate of Chemicals in the Environment Chemical fate in a defined controlled volume boundary conditions Chemical reactions speciation Biological uptake Bioaccumulation Transformation Excretion Physical processes mobility diffusion advection immobilization Source and Fate of Chemicals in the Environment Physical transport Advective transport Diffusive transport Units of interest are units of mass or moles per area volume per unit time Flux J Q etc Atmospheric Transport A knowledge of physical transport and chemical reaction rates is needed to predict concentrations of air pollutants as they are transported away from their source also applicable to water transport Advective motion of fluids gases liquids will disperse a contaminant in the direction of the fluid motion flux density J CV Turbulent and molecular diffusion processes will carry contaminant mass in the direction of decreasing chemical concentration spreading J D dC dx Surface Water Transport A knowledge of physical transport and chemical reaction rates is needed to predict concentrations of water pollutants as they are



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