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Environmental Engineering Chapter 1 Homework What are the four major cations and three major anions
3 Water, Rocks, Solutes and Isotopes 1. What are the four major cations and three major anions in most natural waters? How do these compare with their crustal abundances. What are the three most abundant el oxygen and why are […]
Environmental Engineering Chapter 2 Homework Write The Two Complementary Redox Half reactions For
11 Thermodynamics of Aqueous Systems 1. Calculate the ionic strength of a 0.05 molal Na2SO4 solution, ignoring the effects of complex ions. What are the activities of Na+ and of SO4 2? What would be the effect of any complex […]
Environmental Engineering Chapter 3 Homework Is nitrate a functional electron acceptor for the oxidation
20 Geochemical Reactions 1. Write out the reactions for the dissolution of fluorite and for the hydrolysis of Fe3+, and the equation for the law of mass action for each. CaF2 Ca2+ + 2F Fe3+ + H2O Fe(OH)2+ + H+ […]
Environmental Engineering Chapter 4 Homework What Would The Effect Your Calculations You
26 Isotope Reactions 1. What are the major and trace isotopes of H, C, N and O that can be measured by routine analytical methods? Give the abundance of these isotopes in nature and how they can be measured. The […]
Environmental Engineering Chapter 5 Homework These enrichment factors can be plotted using the temperature
34 Tracing the Water Cycle 1. Plot the enrichment factors for 18O and D for the temperature range of 0 to 50°C and note that fractionation is enhanced at lower temperature. Which isotope is most strongly fractionated and why? If […]
Environmental Engineering Chapter 6 Homework The redox-sensitive species in these groundwaters include
55 (iii) The redox-sensitive species in these groundwaters include DOC and the sulfate/sulfide redox pair. Note that DOC (an electron donor) decreases along the flow path, as does SO4 2, while HS increases along the flow path. From this we […]
Environmental Engineering Chapter 6 Homework What are the activities of dissolved carbonate
43 CO2 and Weathering 1. What are the activities of dissolved carbonate, aCO32, and carbonic acid, aH2CO3 for 25°C water with pH 7.8 and bicarbonate concentration of 86 ppm as HCO3 ? Assume that the bicarbonate activity is equal to […]
Environmental Engineering Chapter 7 Homework The retardation factor needs values for bulk density
67 Geochemical Evolution 1. The following data were produced from batch tests to test the sorption of Sr2+ on a clay till. For the experiment, 100 g of clay till was used with 1 L water with different initial concentrations […]
Environmental Engineering Chapter 8 Homework using residual tritium as an indication of age
75 Groundwater Dating 1. Give examples of radiometric dating methods involving (i) loss of parent, (ii) ingrowth of daughter, and (iii) both loss of parent and gain of daughter. (i) Tritium decay to 3He, using residual tritium as an indication […]