Problem 1. Volatilization of Species A from a River to the Atmosphere (50 pts) With the data presented in lecture (Week 9 ) for the volatilization of species A from a river to the atmosphere (air), predict the concentration ratio (CA,W/CA,W,(o)) at x=100km downstream in the river from the discharge point (x=0) at the chemical facility wastewater treatment plant. Hint: you may determine the river velocity, vw, using the volumetric flow rate (VR), river depth (D), and river width (W). Assume that the temperature is 25C and Henry's Constant is H=1105atm m3/ gram mole (gmole). The water-side mass transfer coefficient is kw=20cm/hr and the air-side mass transfer coefficient is kA=2000cm/hr. Be careful with your units in this problem. Note that the correct value of R is 8.2057105m3atm/ (gmole K ). When this equation is integrated and boundary condition applied, the expression for the concentration ratio representing volatilization loss downstream of the discharge point, at x=100km, is CA,W(o)CA,W=exp(vWavKAWx) Volatilization is significant (most of the pollutant has volatilized) for very volatile, volatile, and moderately volatile pollutants, while most of the pollutant remains in the river water for slightly volatile and nonvolatile pollutants