A student is asked to analyze a water sample from a stream for total solids (TS), dissolved solids (DS) and suspended solids (SS). She carries out the experiments below.
(P) A 25-mL portion of the water sample is evaporated to dryness in a pre-weighed evaporating dish to give mass 1.
(Q) A seperate 25-mL portion is filtred into a second pre-weighed evaporating dish and evaporated to dryness to give mass 2.
How are the values for TS, SS and DS (per 25 mL water) determined?

Options

A. TS = mass 1, SS = mass 1 - mass 2, DS = mass 2
B. TS = mass 1, SS = mass 2, DS = mass 1 - mass 2
C. TS = mass 1 + mass 2, SS = mass 1 , DS = mass 2
D. TS = mass 1 + Mass 2, SS = Mass 2, DS = mass 1

Answer

A