A spill of 5 metric tonnes of a soluble pesticide takes place into a well-mixed pond. The pesticide is subject to volatilization that can be characterized by the following first-order flux:
whereuu = a volatilization mass-transfer coefficient of 0.1 m d-1. Other parameters for the lake are
Surface area = 0.1 x 106 m2
Mean depth = 5 m
Outflow = 1 x 105m3/d
Predict the concentration in the lake as a function of time.
Determine the 95% response time for the system.
Calculate the time required for the concentration to be reduced to 0.1 mg/L.