The saturation concentration of dissolved oxygen in freshwater can be calculated with the equation (APHA, 1992)
where
Remember that
According to this equation, saturation decreases with increasing temperature. For typical natural waters in temperate climates, the equation can be used to determine that oxygen concentration ranges from
(a) If the initial guesses are set as 0 and
(b) Develop and test a bisection program to determine T as a function of a given oxygen concentration to a prespecified absolute error as in (a) Given initial guesses of 0 and
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