## (Solved) EES 202 Biogeochemistry Problem Set 2 (25 points) Spring 2017 Name ________________________ By signing above you acknowledge that this is your own...

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EES 202 Biogeochemistry
Problem Set 2 (25 points)
Spring 2017
Name ________________________
By signing above you acknowledge that this is your own work and that you received no unauthorized
assistance from anyone. Due on Wednesday, March 15, 2017, at the beginning of class. TURN IN THIS
1. Natural sources add sulfur dioxide (SO2) to the atmosphere at a rate of about 108 metric tons of S per year.
The background concentration of atmospheric SO2, measured in remote areas where anthropogenic
sources are not likely to have much influence, is about 0.2 parts per billion, by volume [ppb(v)]. What is
the residence time, in days, of atmospheric SO2 in remote regions? Useful info: molar mass of air = 28.96
g/mol, mass of Earthâ€™s atmosphere is 5.14 x 1021 g, and ppb(v) is equivalent to mole fraction. 2. A stable and highly soluble pollutant is dumped into a lake at the rate of 0.16 metric tons per day. The
lake volume is 4 x 107 m3 and the average water flow-through rate is 8 x 104 m3/day. Ignore evaporation
from the lake surface and assume the pollutant is uniformly mixed in the lake. What eventual steady-state
concentration (in ppm) will the pollutant reach? 3. Examine the Piper Diagram on the following page characterizing the chemistry of a locally wellknown waterway.
(a) Based on where the majority of points plot on the diagram, classify the type of water chemistry
represented by these samples (see the write-up for Piper Diagrams in Lab 7). (b) For the INDICATED DATA POINT (WITH ARROW), what are the percentages of each ion? Cation
Ca2+
Mg2+
Na+ + K+ Percentage Anion
Percentage
2SO4
ClCO32- + HCO3- (c) On the diagram, PLOT a point on each part representing a water sample having the following
percent ions: Ca2+ = 70, Mg2+ = 20, (Na+ + K+) = 10,
SO42- = 60, Cl- = 5, and (CO32- + HCO3-) = 35

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