Determination of dissolved solids in an effluent sample

AIM:
To determine the dissolved solids in a given effluent sample.
PRINCIPLE:
Dissolved solids are the solid matter obtained when an effluent sample after filtration through a whatmann Number 41 filter paper is evaporated on a weighing dish on a steam bath & then dried to constant weight in an oven at 100⁰ c
APPARATUS:

• Crucible 100ml capacity
• Measuring cylinder 100ml
• Steam bath
• Oven
• Desiccator

PROCEDURE:

• Filter the effluent sample through whatmann Number 41 filter paper
• The crucible of 100ml capacity should be cleaned & dried .
• Take the weight of this crucible
• Note the weight taken.
• Take 100ml of the filtered effluent sample to the weighed crucible.
• Note the volume of sample taken
• Evaporate the sample to dryness on a steam bath & complete the drying by heating for 1 hour in an air oven at 100⁰ c
• Cool in a desiccator & take the final weight of the crucible

CALCULATION:

Dissolved Solids= (A-B/C)*10₆

where A =weight of crucible + solids

B = weight of crucible alone

C = Volume of the sample