Environmental chemistry (or ecochemistry) is a key branch of chemistry that examines chemical and biogeochemical processes in nature. Closely linked to soil, water, and atmospheric chemistry, it is often classified under analytical chemistry. Major topics in this field include water purification, biochemical processes of microorganisms, air pollution, and natural and artificial pollutants.Chemistry plays a vital role in our environment. While synthetic chemicals are often blamed for pollution, many past environmental issues, such as microbial contamination of drinking water, were resolved...