The sediment concentrations of 2,2′,4,5,5′-pentachlorobiphenyl (PCB 101, log Kow = 6.36) were… 1 answer below »
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The sediment concentrations of 2,2′,4,5,5′-pentachlorobiphenyl (PCB 101, log Kow = 6.36) were measured in a sediment core from Boston Harbor, with results as shown below. We are interested in understanding release of PCBs from these sediments as part of the clean-up efforts of the harbor.
Please estimate the mean pore water concentration of PCB 101. Assume that for PCBs, Log Koc = 0.74 log Kow + 0.15.
|
Depth interval (cm below surface) |
foc (kg organic carbon/kg sediment) |
Concentration of PCB 101 (ng/g sediment) |
|
6-8 |
0.034 |
15 |
|
8-10 |
0.034 |
15 |
|
10-12 |
0.028 |
20 |
2. (10 points total) Suppose you were doing an environmental risk assessment of a new chemical of concern. Its water solubility is 210 mg/L, its molecular weight is 23, and its vapor pressure is 12 mm Hg.
a) (5 points) What is the Henry’s law constant for this chemical, in both dimensionless units and in units of atm L/mol, at 25°C = 298 K?
b) (5 points) Suppose the concentration of this chemical in a lake is 1.0 ng/L, and the concentration in the air immediately above that sampling spot is 0.1 ng/m3. Based on this data, would you expect this chemical transport from water to air or from air to water?Briefly explain your reasoning.
Attachments:
Assignment-4-….docx
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