Which quality parameter measures the amount of dissolved oxygen in water?

Dissolved oxygen (DO) is the quality parameter that directly measures the amount of oxygen that is present in water in a dissolved form. It is a crucial metric in assessing water quality, as it indicates the ability of the water to support aquatic life. Aquatic organisms, including fish and invertebrates, rely on dissolved oxygen for respiration.

High levels of dissolved oxygen are generally beneficial for aquatic ecosystems, promoting a healthy environment for organisms. Conversely, low levels can lead to hypoxic conditions, wherein aquatic life struggles to survive. Factors affecting DO levels include temperature, salinity, and the presence of organic material, which can consume oxygen during decomposition.

This makes dissolved oxygen a vital parameter in water quality monitoring and environmental assessments, as it provides essential information about the health and sustainability of aquatic ecosystems.