What current pollutants may be seeping into fresh water and well water sources?
Nitrate and nitrite are present in chemical fertilizers, human sewage, and animal waste and fertilizers. They can contaminate a private well through groundwater movement and surface water seepage and water run-off.
What causes limestone to dissolve?
Limestone areas are predominantly affected by chemical weathering when rainwater, which contains a weak carbonic acid, reacts with limestone. This causes the limestone to dissolve. Carbon dioxide in the atmosphere forms very dilute carbonic acid when it dissolves in rain.
What is marble erosion?
When sulfurous, sulfuric, and nitric acids in polluted air and rain react with the calcite in marble and limestone, the calcite dissolves. However, sheltered areas on limestone and marble buildings and monuments show blackened crusts that have peeled off in some places, revealing crumbling stone beneath.
How long does it take to erode limestone?
Limestone dissolves at an average rate of about one-twentieth of a centimeter every 100 years. If you want to see a layer of limestone (about 150 meters thick) dissolve, plan on watching that layer for about 30 million years.
What are the major water pollutants?
The main water pollutants include bacteria, viruses, parasites, fertilisers, pesticides, pharmaceutical products, nitrates, phosphates, plastics, faecal waste and even radioactive substances. These substances do not always change the colour of the water, meaning that they are often invisible pollutants.
Which rock dissolves in water?
The three common rocks that dissolve are rock-salt (halite), gypsum and limestone (including chalk). Dissolution of these rocks produces caves, sinkholes, sinking streams and large springs, creating a landscape known as karst.
What are the pollutants that cause acid rain?
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
What causes weathering of marble?
In fact, air pollution, and in particular the presence of sulfur and nitrogen oxides, results in acidic rain determining the dissolution of calcite in marble and limestones.
What are the 3 major water pollutants?
Water pollutants can be divided into three major categories: (1) substances that harm humans or animals by causing disease or physical damage; (2) substances or situations that decrease the oxygen content of water, leading to anaerobic decay and the death of aquatic life; and (3) substances that are indirectly harmful.
What are the dangers of rainwater collection?
Roofing materials, gutters, piping, and storage materials can introduce harmful substances such as asbestos, lead, and copper into the water. Dirt and germs can be washed into collected rainwater from the roof, especially when rain follows several days of dry weather.
What kind of chemicals are in rain water?
Dust, smoke, and soot from the air can be dissolved in rainwater before it lands on your roof. Roofing materials, gutters, piping, and storage materials can introduce harmful chemicals like asbestos, lead, and copper to the water, though building standards minimize some of this 6-8.
How is particulate matter removed from rainwater?
The rainwater samples were filtered with a membrane filter (pore size: 0.45 μm) to remove any particulate matter. The filtrates were stored in clean polypropylene bottles in a refrigerator at 4°C until chemical and stable isotopic analyses.
What are the most common contaminants in runoff water?
Contaminants in urban runoff water are primarily derived from rainwater from streets, parking lots and highways. Hydrocarbons in this water include primarily gasoline fractions, diesel fuel, and automotive and truck crankcase oil leaks. Of these, crankcase lubricating oil and diesel fuel predominate in runoff water (Romano).
https://www.youtube.com/watch?v=fwnR-LcdYt4