Estimation of total dissolved solids in water:
Requirements: Glass and plastic beaker Spirit lamp
Funnel and filter paper Boiling chips
Procedure:
. Filter the sample water.
. Weigh the glass beaker W1 g
. Take 50 mL of sample water in the glass beaker.
. Evaporate the water carefully until the glass beaker becomes dry.
. Cool and weigh the glass beaker with the boiling chips again, W2 g.
Calculation: Total solid (ppm) = (W1 – W2) x 2 x 104 Filterable residue:
Procedure:
. Weigh the empty glass beaker with boiling chips, W1 g.
. Filter the sample water into a plastic beaker.
. Pour 50 mL of filtered water into the glass beaker.
. Evaporate the water carefully until the glass beaker becomes dry.
. Cool and weigh the glass beaker with the boiling chips again, W2 g.
Calculation:
Filterable residue (ppm) (W2 – W1) x 2 x 104
Non-filterable residue (ppm) = total solid – filterable residue.