The sediment oxygen demand [SOD in units of g/(m² · d)] is an important parameter in determining the dissolved oxygen content of a natural water. It is measured by placing a sediment core in a cylindrical container (Fig. P21.35). After carefully introducing a layer of distilled, oxygenated water above the sediments, the container is covered to prevent gas transfer. Astirrer is used to mix the water gently, and an oxygen probe tracks how the water’s oxygen concentration decreases over time. The SOD can then be computed as

where H = the depth of water (m), o = oxygen concentration (g/m³), and t = time (d).

Based on the following data and H = 0.1 m, use numerical differentiation to generate plots of (a) S

OD versus time and (b) SOD versus oxygen concentration:

Transcribed Image Text:

do dt SOD=-H-