Imhoff cone is used to measure-
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A.
Dissolved solids
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B.
Settleable solids
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C.
Suspended solids
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D.
Colloidal solids
Correct Answer:
B. Settleable solids
Explanation:
An Imhoff cone is a specialized laboratory instrument used to determine the volume of settleable solids in a liquid sample, typically wastewater or surface water. During the test, a one-liter sample is poured into the graduated cone and allowed to sit undisturbed for a set period, usually one hour. The solids that gravity causes to sink to the bottom are then measured in milliliters per liter (mL/L). This measurement is essential for assessing water quality and monitoring the efficiency of sedimentation processes in treatment plants. While the cone can be used to estimate suspended sediment in certain contexts, its primary and standard function is the quantification of settleable matter.
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