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) lea ...continues
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 ...continues
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 sunn ...continues
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 ...continues
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 ...continues
Calculation of pH of Rainwater Due to Carbon Dioxide
Calculate the pH of pure water for a CO2 mixing ratio of 350 ppm at 298 K. What would be the pH at this temperature if the CO2 mixing doubles?
Rate Equation for Atmospheric Oxidation of S(IV) to S(VI)
a) Calculate the liquid phase / gas phase ratio for SO2, HNO3, HCl and H2O2 in a cloud droplet (L= 10-6) and determine which phase dominates. b) Explain why the atmospheric rate of formation of S(VI) in the aqueous phase is given by (Please see attachment for atmospheric rate of formation) where k is the liquid-phase rate ...continues
A solvent for an industrial process requires the use of phenol or benzene.
A solvent for an industrial process requires the use of phenol or benzene. Both are about the same in effectiveness for the process, and of course, gloves will be used when handling either solvent. As an environmental safety officer for the company, which one would you recommend the use of and why? Also what set-up would you rec ...continues
Benzene and Phenol: Discussion of LD50 and LDLO
With Benzene and Phenol: Does one molecules consistently have a greater LD-50 for all species? explain Are the relative LDLO for benzene and phenol as you would expect? How were the LDLO for humans obtained? How reliable are the LDLO? Explain which data you would use to determine a lethal dose for you and calculate the ...continues
Precipitation of zinc solids in a wastewater system?
Can you please take a look at the attached and give me some feedback. I want to understand why specifically pH is driven way low and then way high to promote precipitation of the zinc solids. Please take a look and comment. In our process, zinc borate (2ZnO-3H3BO3-3H2O) ultimately splits and dissociates to zinc oxide and b ...continues
