Which parameter is a measure of the amount of dissolved salts and minerals, present as ions, within an aqueous solution?

Which parameter is a measure of the amount of dissolved salts and minerals, present as ions, within an aqueous solution?

• A. pH
• B. Conductivity
• C. Dissolved oxygen
• D. Nitrites

Answer: (B)

Measuring how well a solution conducts electricity reflects the amount of dissolved salts and minerals present as ions. When salts dissolve, they split into positively and negatively charged ions, and those ions carry current. More ions mean higher conductivity, so this parameter directly tracks ionic content. Other options don’t measure total dissolved salts: pH gauges hydrogen ion activity (acidity), dissolved oxygen measures oxygen gas in solution, and nitrites indicate a specific contaminant. Temperature can affect conductivity, so readings are often temperature-compensated, but the fundamental idea is that conductivity is the best proxy for dissolved ionic content.

Measuring how well a solution conducts electricity reflects the amount of dissolved salts and minerals present as ions. When salts dissolve, they split into positively and negatively charged ions, and those ions carry current. More ions mean higher conductivity, so this parameter directly tracks ionic content. Other options don’t measure total dissolved salts: pH gauges hydrogen ion activity (acidity), dissolved oxygen measures oxygen gas in solution, and nitrites indicate a specific contaminant. Temperature can affect conductivity, so readings are often temperature-compensated, but the fundamental idea is that conductivity is the best proxy for dissolved ionic content.