Geochemistry can be viewed both as a scientific discipline with its own basic unanswered questions and as a set of tools for answering questions in other geologic subdisciplines. In this course, both perspectives on environmental geochemistry will be examined. We will begin by discussing general geochemical principles and biogeochemical cycles. We will also discuss the influence of rocks and soils on water chemistry and the use of isotopes as environmental tracers. The course includes a class project addressing a local environmental topic (e.g., influence of wildfires on snow chemistry, or the effect of land use on soil chemistry).
Upon successful completion of Environmental Geochemistry (GEOL 425/525):
1. Global geochemical cycles -- Students can describe geochemical cycles of water and carbon in terms of their principle reservoirs, residence times in those reservoirs and fluxes between major reservoirs. They can differentiate between long-timescale processes (such as silicate weathering) and short-timescale processes (such as anthropogenic increase in atmospheric CO2).
2. Equilibrium thermodynamics -- Students comprehend and can describe in their own words the laws of thermodynamics. They understand how the equilibrium constant of a reaction can be derived from expressions for chemical potential and Gibbs free energy.
3. Laboratory skills -- Students have basic laboratory skills necessary to carry out a supervised geochemical study (e.g. can perform Gram titration of waters in field, can collect water samples using clean methods).
4. Water and soil chemistry -- Students have basic knowledge of water and soil chemistry, controls on pH, cation and anion concentrations.
5. Acid-base chemistry -- Students have a basic knowledge of acids and bases, their properties and behavior. Students understand the relative strengths of acids and bases and related equilibria.
6. Knowledge of different techniques -- Given an environmental geochemical problem, students are aware of geochemical techniques (isotopes, trace elements, etc.) which might be used to address that problem.
7. Current topics -- Students are aware of current topics of research in environmental geochemistry and can read and critically discuss a research article.
Reading assignments – Twice during the term, students will be assigned short articles from the literature. They will present oral summaries of these articles to the class.
Class project – This year, the class will perform a group research project studying the trace element chemistry of snow, frost, or water. The class will work together to define the research question(s) that will be addressed. All students will participate in sample collection, sample preparation, and data collection. Although data collection will be done as a group, each student will write an individual research report.
Exams – Two exams will be given throughout the quarter. The first will be given mid-quarter; the second will be towards the end of the term. Both exams will be a combination of homework-like calculation problems and short answer questions.
Graduate students – Students who take GEOL 525 will be given additional work (extra homework problems, extra test questions, etc.) throughout the term. In addition, graduate students will be required to prepare and present a short proposal for a research project of their choice in the field of Environmental Geochemistry.
Homeworks = 10%
Reading Assignments = 10%
Class project = 30%
1st Exam = 25%
2nd Exam = 25%
Graduate students: subtract 2% from all of the above, Proposal = 10%
Final grades are based on % of total points. A = 90-100%; B = 80-89%;
C = 68-79%; D = 50-67%; and F = less than 50%.
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