Compute the saturation concentration for dissolved oxygen in water - MATLAB Cody - MATLAB Central

Problem 60830. Compute the saturation concentration for dissolved oxygen in water

Difficulty:
(2)
Rate
As organic matter from wastewater decomposes, it consumes oxygen, and an assessment of the effect of a wastewater discharge on the receiving water uses the saturation concentration of dissolved oxygen (DO) as a reference. This concentration decreases with temperature, salinity, and elevation. For freshwater at sea level, the saturation concentration o_sf in mg/L is given by (APHA 1992)
ln(o_sf) = -139.34411 + 1.575701 x 10^5/T_a - 6.642308x10^7/T_a^2 + 1.234800x10^10/T_a^3 - 8.621949x10^11/T_a^4
where T_a = T + 273.15 is the absolute temperature (K) and T is the temperature in deg C. For saltwater at seal level, the saturation concentration o_ss in mg/L is given by (APHA 1992)
ln(o_ss) = ln(o_sf) - S(1.7674x10^{-2} - 1.0754x10^1/T_a + 2.1407x10^3/T_a^2)
where S is the salinity in g/L or parts per thousand (ppt). Then if o_s0 is the saturation concentration at sea level (i.e., elevation 0), then the concentration o_sz at elevation z (in km) is (Zison et al. 1978)
o_sz = o_s0 (1 - 0.1148 z)
For T = 20 deg C, the saturation concentration of freshwater is 9.092 mg/L at sea level and 8.049 mg/L at an elevation of 1 km. For saltwater at sea level, a temperature of 20 deg C, and a salinity of 33 ppt, the saturation concentration is 7.484 mg/L.
Write a function to compute the saturation concentration of dissolved oxygen in water as a function of temperature, elevation, and salinity.
Solve

Solution Stats

100.0% Correct | 0.0% Incorrect
Last Solution submitted on Mar 24, 2025

Problem Comments

Solution Comments

Show comments
Who Deserves Your Praise? Discover the New Contribution Widget!
...
We are excited to announce another update to our Discussions area: the...

Problem Recent Solvers2

Suggested Problems

More from this Author292

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!
Go to top of page