Adsorption of Heavy Metals in Soil : Langmuir Adsorption Equation
A peat soil was found to have the following Langmuir constants for the adsorption of heavy metals. Metal Q (adsorption capacity) k (Langmuir reaction energy) Lead (Pb2+) 36.5 1.096 Cadmium (Cd2+) 10.6 0.483 Chromium (CrO42-) 6.8 0.330 Langmuir adsorption equation qe = QkCe / (1+ kCe) Where qe is met ...continues
Migration of Pesticide from Soil to Groundwater
The following percentages of three pesticides added to a soil remained after increasing times. Time (days) Diazinon % Benefin % Terbutol % 0 100 100 100 15 18.7 no data no data 30 1.50 57.5 94.3 60 0.30 29.0 80.2 90 0.01 14.5 73.7 180 0.01 7.50 51.3 1) Fit the decomposition data f ...continues
Efficiency of Electric Baseboard Heat, Recycling Energy and Renewable Energy
1. A home builder installs electric baseboard heat and claims, "It is the cheapest and cleanest way to go." Apply your understanding of the second law of thermodynamics and net energy efficiency chain to evaluate this claim. 2. Someone tells you we can save energy by recycling it. How should you respond? 3. Should governme ...continues
1. Just to continue using oil at the current rate (not the projected higher exponential rate), we must discover and add to global oil reserves the equivalent of a new Saudi Arabian supply (the world's largest) every 10 years. Do you believe this is possible? If not, what effects might this have on your life and on the life of a ...continues
OSHA Permissible Exposure Limits
Q1. Suppose that an industrial process produces the following air-contaminant concentrations for the periods shown: Period Methanol(ppm) Nitric Oxide(ppm) Sulfur Dioxide 8AM - 10 AM 50 5 0 10AM - 11 AM 150 10 1 11 AM - ...continues
Wet Limestone Process : Calcium Carbonate and Calcium Sulfate
Assume that the wet limestone process requires 1 metric ton of calcium carbonate to remove +50.0% of the sulfur from 4 metric tons of coal containing +5.0% S. Assume that the sulfur product is calcium sulfate. Calculate the percentage of the limestone (calcium carbonate) converted to calcium sulfate.
Environmental Chemistry : Global Warming, Climate Change and Albedo
1.In preparation for the 1992 UN Conference on the Human Environment in Rio de Janeiro, President George H. W. Bush's top economic adviser gave an address in Williamsburg, Virginia, to representatives of governments from a number of countries. He told his audience not to worry about global warming because, the average temperatur ...continues
Hydrogen from Solar-Powered Electrolysis
Assume that due to dwindling supplies of crude oil and natural gas, the US embarks on a plan to implement the "hydrogen economy" for which hydrogen will be generated by electrolysis of water. The source of electricity is from photovoltaic (PV) conversion of sunlight in the southwestern US. (a) Assume that a flat plate P ...continues
An industrial hygiene survey has been conducted to determine whether exposure of workers to ethyl benzene (molecular weight 106) exceeded the OSHA PEL of 100 ppm. The exposure time and levels are: Period of Time Average Hourly Exposure 8:00-10:00 am 90 ppm 10:00-1 ...continues
What is the redox potential of an acid mine water sample having Fe3+ = 8 x E-03 M and Fe2+ = 2 x E-04 M given that E0 for the Fe3+/Fe2+ couple is 0.77v.
