5.18 The saturation concentration of dissolved oxygen in fresh- water can be cal

Question

5.18 The saturation concentration of dissolved oxygen in fresh- water can be calculated with the equation (APHA, 1992) 1.575701×105 Ino,r=-139.34411+ 6.642308×107 T2 1.243800 × 1010 8.62 1949 x 1011 T4 where os, the saturation concentration of dissolved oxygen in freshwater at 1 atm (mg/L) and Ta absolute temperature (K). Remember that = T+ 273.15, where T= temperature (C) 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 14.621 mg/L at 0 C to 6.413 mg/L at 40 C. Given a value of oxygen concentration, this formula and the bisection method can be used to solve for temperature in C (pode should be in MATLAB or Mathematica)

Explanation / Answer

t=input("enter ta")

ta=t+273.15

m=-139.34411+1.575701*10^5/ta-642308*10^7/(ta^2)+1.243800*10^10/(ta^3)-8.621949*10^11/(ta^4)

osf=e^m

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