Humans can have profound influences on lake chemistry.
Emissions from motorized vehicles, fossil fuel-burning electric utilities and industry, and other sources produce a variety of compounds that affect lake chemistry. A solution with a pH of less than 7.0 is considered acidic. The increase in concentration of a chemical in organisms that reside in environments contaminated with low concentrations of various organic compounds. Also used to describe the progressive increase in the amount of a chemical in an organism resulting from rates of absorption of a substance in excess of its metabolism and excretion. Lakes that have a high buffering capacity and are not generally sensitive to acid deposition.