Black shale, or “metalliferous shale” forms under reducing conditions (anaerobic) and commonly associated closely in the roof and floor of many coal seams. Such reducing environments could present in fresh, brackish, marine or even hypersaline waters. Sulfide minerals are common in black shales. The reducing conditions form from lack of oxygen usually caused by bacteria. [...]
Archive of posts tagged geochemistry
Chromium Eh-pH and pe-pH diagrams, solubility, remediation, speciation : Guide for Chemical Modeling
Chromium is one of the RCRA elements and considered teratogenic, mutagenic and carcinogenic. In this article, we will explore the basic geochemical properties of chromium. If you are involved in any environmental projects involving dissolved chromium, the Eh-pH diagrams may help. This is my own version of CHROMIUM 101! Article by Ankan Basu, P.G (Contact [...]
Eutrophication of lakes due to phosphate contamination
Non-contaminated lakes are “aerobic” (oxygenated) and maintain “oligotrophic” (very low levels of nutrients) condition. Limited number algae grow in such lakes due to limited amount of nutrient available to them. Such lakes are also suitable for the fish population and support aerobic microbes. Facultative anaerobic organism cannot survive in such environment. A facultative anaerobic organism [...]
Calculate Hardness of Water using Excel Spreadsheet: Geochemistry Tips
July 11, 2011 (Coal Geology) Hard water is water referes to the alkaline earth ion concentrations. The primary alkaline earth ions are Ca2+ and Mg2+. Calcium usually dominates over magnesium concentration. Some important Points: Hard water is generally not harmful to one’s health pose serious problems in industrial settings, where water hardness is monitored to avoid [...]
Aqueous Environmental Geochemistry
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