What is the environmental fate and disposal of chemicals commonly used to treat wood (pentachlorophenol, copper chromium arsenate and cresol)?

I have an environmental chemistry course in which we are currently studying the environmental and health impacts of wood preservatives such as cresol, pentachlorophenol, and chromated copper arsenate. Question 1: For the 3 wood preservatives noted, would acidic vs. alkaline soil or water conditions cause more (or less) leaching or dissolution of these compounds. How do these compounds actually leach out of wood into the environment? Question 2: For the 2 organic preservatives, cresol and pentachlorophenol, and assuming that they are present in the wood, what happens when the wood is combusted? What are the combustion by-products of cresol and pentachlorophenol? Are they actually ... click for more

The concentraion of lead from mine tailings that are worked into the ground is calculated.

Lead from mine tailings containing 0.6 % lead was applied at a rate of 12 metric tons per acre of soil and worked in to a depth of 20 cm. The density of the soil is 1.8 g/cm3. To what extent does this add to the burden of lead in the soil? (There are 640 acres per square mile and 1609 meters in a mile.) a) 19 ppb b) 45 ppb c) 19 ppm d) 49 ppm

SO2 Concentration Downwind from a Power Plant

4) A power plant burns 10^4 kg hr-1 of coal that contains 2.5% sulfur. The stack is 50 m high, and the plume typically rises 30 m. a) Calculate the ground-level concentration of SO2 (in micrograms m-3) 800 m downwind from the source directly under the plume under the following conditions: Wind speed = 4 m s-1, moderately sunny day (moderately unstable conditions). b) Repeat the above calculation for a stack height of 75 m and a wind speed of 6 m s-1. Please see attachment for graph and tabular column.

Using a box model for the city, calculate the average steady-state concentration of pollutants if the average pollutant emissions from the city are 2×10^-5 g m-2 s-1 and the wind speed is 4 m s-1.

1) Consider an urban area (100 km^2) with a temperature profile that decreases linearly with height between 30 degrees C at the surface, and 24 degrees C at 500 m. At 500 m, the temperature increases with height to 30 degrees C at 1000 m. What is the mixing height for this situation? Using a box model for the city, calculate the average steady-state concentration of pollutants if the average pollutant emissions from the city are 2×10^-5 g m-2 s-1 and the wind speed is 4 m s-1.

Plotting plume concentration of SO2 around a powerplant.

1) A power plant burns 10^4 kg hr-1 of coal containing 2.5% sulfur. The effluent is released from a single stack of height 70 m. The plume rise is normally about 30 m. The wind on the day of interest, which is a sunny summer day, is blowing at 4 m s-1. There is no inversion layer. a) Plot the ground-level SO2 concentration at the plume centerline over distances from 100 m to 10 km. b) Plot the ground-level SO2 concentration versus crosswind distance at downwind distances of 200m and 1 km. c) Plot the vertical centerline SO2 concentration profile from ground level to 500 m at distances of 200 m, 1 km, and 5 km. Use Excel or your favorite spreadsheet program to generate the c... click for more