Given below are two statements. In the light of the above statements, choose the most appropriate answer from the options given below.
Statement I:The total solids (dissolved and suspended) in a wastewater sample are the materials left after water has evaporated from the sample.
Statement II:The dissolved solids fraction usually includes colloidal particles.
ABoth Statement I and Statement II are correct ✓ Correct
BBoth Statement I and Statement II are incorrect
CStatement I is correct but Statement II is incorrect
DStatement I is incorrect but Statement II is correct
Correct answer: (A) Both Statement I and Statement II are correct
Explanation
The total solids in a wastewater sample are what remain once all the water has evaporated.
Statement 1 is correct because these leftover dissolved and suspended materials define total solids.
They are found by drying a measured sample and weighing the residue.
Statement 2 is correct because the dissolved solids fraction is taken to include colloidal particles.
Colloids are too fine to settle or be trapped by an ordinary filter, so they count with the dissolved part.
Total solids are split into filterable dissolved solids and non-filterable suspended solids.
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