What is meant by total dissolved solids (TDS) in water?

Total dissolved solids (TDS) refers to the total concentration of dissolved substances in water, primarily minerals, salts, and organic matter. These dissolved constituents can include ions such as calcium, magnesium, potassium, sodium, bicarbonates, sulfates, and chlorides. The measurement of TDS is important because it helps to evaluate water quality and its suitability for various uses, including drinking, agriculture, and industrial processes.

Understanding TDS is crucial for water operators, as high levels can affect the taste of drinking water, impact aquatic life, and indicate the presence of pollutants. Monitoring TDS levels is also essential when treating water to ensure compliance with health standards and optimize treatment processes.

In comparison, the other options do not accurately define TDS. The presence of bacteria relates to microbial contamination, while the total volume of water and total temperature are physical properties that do not pertain to dissolved solids. Thus, the correct definition of TDS aligns with the total mineral content found in the water.