4.(12 pts) Controlled release of chemicals is important in agriculture, especial

Question

4.(12 pts) Controlled release of chemicals is important in agriculture, especially for insect control. One common example involves the use of pheromones, attractants released by insects. If you mix this attractant with an insecticide, you can control all of one sex of a particular insect pest thereby limiting its population. A potential device for releasing a pheromone is shown below.

For this device answer the following questions.

a. How long will it take for the flux through the barrier to reach steady-state (d)?

b. What will be the flux of pheromone through the barrier and into the air immediately after the barrier is put in place (mg/cm2s)?

c. What will be the flux of pheromone into the barrier 60 seconds after the barrier is put in place (mg/cm2s)?

d. At steady-state what is the flux of pheromone out of the barrier (mg/cm2s)?

e. How fast is the pheromone released by the device (mg/s)?

f. If the chamber were full of water instead of air would the flux out of the barrier change? In what direction? Explain.

g. Would you expect wind speed to impact the rate of release by the device? Explain.

h. If you wanted to increase the rate of release by the device what design change(s) could you make?

impermeable holder Solid pheromone c PA 0.2 mg/L. coPw 5 mg/L. PA 0.06 cm2/s DPW 3.4E-6 cm2/s PB 1.9E-8 cm /s, O O 5 cm3 of air Polymeric diffusion barrier (B), thickness -0.06 cm, area 2 cm2. KPAB 1E-5

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