Download ENVE3503 – Environmental Engineering Expectations for Chapter 2

ENVE3503 – Environmental Engineering
Expectations for Chapter 2, Environmental Measurements
1. Know the names and quantitative meaning of the five metric prefixes commonly used in
environmental applications.
2. Understand how mass/mass concentration units are applied in assessing contaminant levels in biota
and sediments.
3. Be able to perform mass/mass calculations, e.g.
a. Problems 2.22 and 2.23
b. Mercury levels in Lake Erie walleye averaged 0.3 ppm in 1977. Express this in an appropriate
mass/mass format.
4. Understand how mass/volume and mole/volume concentration units are applied in expressing
contaminant levels in water.
5. Be able to perform mass/volume and mole/volume calculations, e.g. Problems 2.2 (a. 10 ppmm, b.
0.16 mmoles/L, c. 2.26 mgNO3-N/L and d. 10,000 ppbm) and 2.5. (a. 10.9 and b. 1.6).
6. Be able to convert chemical concentration expressions between mass/volume and normal, e.g. how
many grams of CaCl2 would be dissolved in 1 liter of water to yield a 1M solution?
7. Understand the difference between a gram molecular weight (a 1 molar solution is 1 gmw/L) and a
gram equivalent weight (a 1N solution is 1 gew/L). Calculate the total hardness, expressed as
mgCaCO3/L, of a water sample containing 12 mg/L Ca2+, 10 mg/L Mg2+, 6 mg/L Fe2+ and 1 mg/L Sr2+.