What does IOC represent in water quality terminology?

In water quality terminology, IOC represents "Inorganic Compound." This term refers to chemical compounds that do not primarily consist of carbon and hydrogen and are essential for evaluating water quality. Inorganic compounds can include metals, salts, and minerals that play critical roles in determining the chemical properties of water.

The identification of inorganic compounds is crucial in water treatment and analysis, as they can affect water's hardness, conductivity, and overall suitability for consumption and other uses. Understanding the presence and concentrations of various inorganic compounds helps water operators ensure safety and compliance with regulatory standards. Thus, the correct choice points to a significant category in the assessment of water quality, emphasizing the importance of inorganic components in understanding water chemistry.