How does specific conductance relate to actual TDS in water?

Specific conductance, measured in micromhos per centimeter (ųmho/cm), is an indication of the ability of water to conduct electricity, which correlates with the concentration of dissolved solids in the water. Total Dissolved Solids (TDS) represent the total concentration of ions or dissolved particles in the water.

The relationship between specific conductance and TDS can vary based on the types of ions present in the water. However, a common conversion factor used in practice is that for every 1.0 ųmho/cm of conductivity, the TDS concentration is approximately 0.9 mg/L. This is due to the fact that different ions affect conductivity differently, but on average, this factor is a practical estimate for many types of natural waters.

Therefore, the correct response indicates that there is a close correlation whereby an increase in conductance reflects an increase in dissolved solids, aligning well with common empirical data used in environmental monitoring and water treatment practices. Understanding this relationship is crucial for assessing water quality and making appropriate decisions regarding water treatment processes.