Applications of Environmental Aquatic Chemistry, 3rd Edition

16 Applications of Environmental Aquatic Chemistry

Note that 3.79 ppm has all of the following meanings: 3.79 g of sodium in

10

6

g of solution, or 3.79 × 10

−3

g (3.79 mg) of sodium in 10

3

g (1 L) of solution,

or 3.79× 10

−6

g (3.79 µg) of sodium per gram of solution.

Example 2: Calculating a Concentration in Air

The equations used in these calculations are based on the ideal gas laws that are

discussed in introductory general chemistry textbooks. The equations are used

here without derivation.

The atmospheric ozone (O

3

) level in Denver, Colorado, was reported to be

2.50 ppmv

2.50 LL

Oa

ir

3

/

µ

()

. At the time of the ozone measurement, atmospheric