Links

Department of Earth Science |Northeastern Illinois University

AQUEOUS GEOCHEMISTRY
ESCI 406
Spring, 2005

Geochemical Software and Other Downloads

A thermodynamics calculator at this site allows you to calculate change in enthalpy and free energy for many different reactions. The site is comprehensive and includes good sections on thermodynamics, equilibrium, and other areas of chemistry.

PHREEQCI: PHREEQCI is a program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations. At this page, click on "PhreeqcI Version 2.11-148 (February 7, 2005) (10.3M)" to download. Keep track of where you save it to, so that you can find it again. Beware: if you have a slow connection, it can take a long time to download! When you are done downloading, find the folder you saved it to, and then click on the icon to install it. Unless you tell it otherwise, it will install to C:\Program Files\USGS\Phreeqc Interactive 2.11.

The PHREEQ user's manual from the USGS is at this location. Warning: It's 326 pages long!

"HYDROGEOCHEMICAL MODELING WITH PHREEQC": A guide to using PHREEQC, by C.A.J. Appelo.

Examples of PHREEQC applications, by C.A.J. Appelo.

Vincent Post's PHREEQC for Windows site is here. Lots of links!

For a PowerPoint show giving some information on using PHREEQCi, click here, and then select "solutions.ppt". This link is to the website of Dr. Bernhard Saini-Eidukat of North Dakota State University. Other useful materials can be found on his website, as well. The slide show was written by the USGS and can be uncompressed from their site, which can be found here.

USGS Water Supply Paper 2254: Study and Interpretation of the Chemical Characteristics of Natural Water, by John D. Hem. Available as a .pdf file.

GW_Chart: Software from the USGS for creating Piper trilinear diagrams and several other kinds of charts.

Department of Earth Science | Northeastern Illinois University