Which of the following is NOT an example of an organic contaminant?

The selection of toxic metals as the answer highlights an important distinction in water treatment and environmental science. Organic contaminants are characterized by their carbon-based molecular structure, typically derived from living organisms or synthetic processes involving natural organic substances. Examples include pesticides, THMs (trihalomethanes), and solvents, all of which contain carbon and are categorized as organic compounds due to their composition.

Toxic metals, on the other hand, are inorganic substances. They do not contain carbon as part of their molecular structure and include elements such as lead, mercury, cadmium, and arsenic. These metals can pose significant health risks and are often found in water due to industrial waste, mining, or natural occurrences, but they do not fall within the category of organic contaminants.

Understanding the differences between organic and inorganic contaminants is crucial for effective water treatment strategies, as they require different approaches for removal and management in water supplies.