Overview
part 1
◼ Question 1 What is the rate of Fe2+ oxidation in pH 5 and 7 solutions if [Fe2+]= 1 mM and PO2=0.2 atm ? (in abiotic reaction system)
◼ Question 2 Mn2+ oxidation rate is very low in abiotic system (at low pH conditions). Explain how to accelerate this oxidation in the solution without using microorganisms?
part 2
◼ Question 1 Estimate the concentration of ferrous ions released when 10 g pyrite undergo oxidative dissolution in a solution of pH 2 and 3 for 2 days. The surface area is 0.7 m2 /g, the solution volume is 1 L, and dissolved oxygen is 7 mg/L.Estimate the amount (mg) of ferrihydrite formed when 50 g pyrite undergo oxidative dissolution in a solution of pH 12 for 8 days. Other conditions are the same as above.
◼ Question 2 Estimate the amount (mg) of ferrihydrite formed when 50 g pyrite undergo oxidative dissolution in a solution of pH 12 for 8 days. Other conditions are the same as above.
part 3
1. From the Environmental applications: Please research a case of a real-world application of one the following aquatic chemistry concepts: • Neutralization/precipitation (for example: heavy metals from AMD) • Adsorption (for example: heavy metals, nuclear contaminants, etc) • (Photo)catalysis of contaminants present in water (for example: organic pesticides) Then, describe in your own words the positive and negative aspects of the real-world case you selected
2. From the Resources recovery applications: Select one important resource (for example: Co, Zn, P, Au, Pt, etc.), and please describe a recovery route which uses one of the following aquatic chemistry concepts: • Leaching • Precipitation • Adsorption