Explore BrainMass

Chemical Measures of Environmental Indicators

Chemical measures of environmental indicators are a type of ecological measure which are critical in assessing the state of the environment. Often times the most practical and economical method for tracking the state of a particular area is through the use of environmental indicators. For example, what if a municipal government was concerned that the water being supplied to households was unhealthy? Well, a possible way for assessing the water quality from the supply lake would be to track the levels of certain chemical measures such as the pH, pesticides and the amount of specific metals such as lead and copper. These variables can be measured using collected water samples. Water does contain trace amounts of many metals, but high levels are toxic. By using these chemical measures, the municipality would be able to gather specific information pertaining to the quality of the city’s drinking and household water supply. There are a multitude of chemical measures which can be used to track the state of the environment. Some examples of potential chemical measures include pH levels, heavy metals, nutrients, pesticides, greenhouse gas emissions, soil quality and water quality. Often, particular species, such as frogs which have very sensitive skin, can be used to track chemical changes in the environment as well. Thus, chemical measures can be used in combination with other ecological measures, such as biological measures, to track the state of the environment. Clearly there is a diversity of chemical measures available, which can be measured and tracked across different scales. The overall objective in using these measures is to supply the general public, policy makers and other stakeholders with information pertaining to the state of the environment. Hopefully, this will assist society in making decisions to preserve the health and integrity of different environments across the globe.

Petrol vs. Ethanol to mitigate Greenhouse Gas Emission from Cars

Hello, I was wondering whether you would be able to complete my chemistry assignment that I have received. I have attached the task sheet, scaffolding for refuting the statement and scaffolding for supporting the statement (depending on which one you choose). The due date for this assignment is this Friday so I would prefer to

Phytoremediation of lead in soil

Indian mustard (brassica juncea) can be used for phytoremediation of lead in soil because it has the ability to hyper accumulate lead by a factor of 17. The average crop yield is about 4.0 kg per square metre. a) Calculate the expected plant concentration of lead if the soil contains 280 ppm. b) What mass of lead would p

Wastewater Treatment - Numerical Problem

Can you answer some more Q about the same problem and let me know the number of Credits you ask for please? And OK, next time I will post it in Engineering.. for the same problem: d-The theoretical chamber lenth,ft e-The design chamber lengh, ft, if the design length is 1.35 time the theoretical length and for ease of cons

Environmental Science #5

Currently, I have an F average in this class and need assistance. Please assist me. If I receive a 100 this will bring my grade to at-least a C. My GPA 3.4 and it is important to me to maintain it. Please help

Environmental Science #2

I need assistance with a project concerning demographic transition, which is little confusing to me. I am really concerned with this class as I have a failing grade. Any and all of your assistance will be greatly appreciated. I really need your help with this assignment Not all countries have moved through all four phase

Effects of coal combustion

Coal combustion can affect freshwater or marine (saltwater) organisms in different ways. Describe the steps involved in one such way, from combustion to the effect(s) on one species or group of organisms. Which environmental sphere(s) is involved in each step, and how?

Amount of Calcium Carbonate Dissolved

The average pH of precipitation in rural areas is 6.80. Assuming that the pH Is controlled by the carbonate system, i.e., no anthropogenic acid gases are present in the atmosphere; calculate the amount of calcium carbonate (mg) dissolved per liter of rainwater. pKa1=6.33, KCO2=3.388e-02 I've seen a couple different solutions

The consumption of dissolved oxygen in water by sugar.

A large pond is 300m by 95m with an average depth of 2.5m. Assuming that the pond is saturated with oxygen, calculate the amount of sugar (C12H22O11) in kg that would be sufficient to completely consume the dissolved oxygen.

Calculate the geologic sink and source of As (arsenic) at the lake bottom.

A situation with an industrial input of arsenic directly into the lake at 10kg/Day. The lake volume is 1.2 x 10^8 m^3, and the average depth is 10m. The river velocities are measured as 100 L/min at both the inflow and outflow points. Water samples taken from the rivers show incoming arsenic is 0.02mg/L and the outgoing arseni

Calcium Carbonite in a Lake

If a piece of Calcite (Calcium Carbonate) is put into the lake, would it tend to dissolve? Calcium carbonate solubility is 10^-8.35 M2, and the measured concentration of calcium ion is 0.1mM (millimolar) Information received: Lake pH=4, and total carbonate concentration of 0.001M. Carbonate Equilibria: CO2 + H20 <-> H2

Environmental Chemistry

6.21 Your metropolitan area has been warned by the EPA to lower sulfur dioxide and nitrogen oxide emissions or it will lose substantial federal funding. One citizen's group calls for conservation as a means of drastically reducing electricity consumption. A second group advocates curtailing the use of automobiles through a va