Which of the following is NOT a type of solids determination?

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Multiple Choice

Which of the following is NOT a type of solids determination?

Explanation:
Solid determinations focus on measuring the amount of solid material in a sample. Total suspended solids measure the mass of particles that stay on a filter and don’t pass through, dissolved solids quantify what remains dissolved after filtration, and settleable solids are particles that will settle out under gravity in a set time. Chemical Oxygen Demand is different: it evaluates how much oxygen is needed to chemically oxidize the organic and inorganic matter in the sample, which reflects pollutant strength rather than the mass of solids. COD is reported as mg/L of oxygen consumed and involves chemical digestion, not gravimetric weighing. So COD is not a solids determination.

Solid determinations focus on measuring the amount of solid material in a sample. Total suspended solids measure the mass of particles that stay on a filter and don’t pass through, dissolved solids quantify what remains dissolved after filtration, and settleable solids are particles that will settle out under gravity in a set time. Chemical Oxygen Demand is different: it evaluates how much oxygen is needed to chemically oxidize the organic and inorganic matter in the sample, which reflects pollutant strength rather than the mass of solids. COD is reported as mg/L of oxygen consumed and involves chemical digestion, not gravimetric weighing. So COD is not a solids determination.

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