3.2 (3 points) Using the model shown here, to calculate the Fig. 3 half time of DDT (an insecticide) in the environment. Here Air are the physical properties of DDT for your calculation: (10" m) Henry's law constant at 25 C is 8.3 x 10 atm-m'/mol, logkon is 6.1, and the (pseudo) first-order rate constants for Its loss from air, water, and soil/sediment are 0.18,0.01, and K. Octanol Water 2x10* day!, respectively. Assume 365 day/year, give the (soil & sediment) (2x10" m') final answer in unit ol year. (NOTE: R=0.082 Leatm.Komol! (1.5x 10 m pay attention to unit conversion). According to UNEP, a chemical is considered as persistent when its half time is greater than 0.5 year in soil/sediment. Based on your calculation, do you think DDT is a persistent organic pollutant (POP) or not. CS Scanned with CamScanner