Solids Lab


 

Analysis

Total Solids

Initially, the water from a well mixed sample was evaporated in an oven set at approximately 103° C. From this data, the total solids concentration can be calculated as:

where:

TS = total solids (mg/L)

mci = initial crucible mass (mg)

mcf = crucible mass after drying (mg)

V = sample volume (L)

Afterwards, the sample was placed in a muffle furnace. From this data determine the volatile fraction from:

where

VS = volatile solids (mg/L)

mcx = crucible mass after ignition (mg)

The fixed fraction can then be determined from the difference between the two calculated fractions

FS = TS VS

Suspended Solids

The data from the filtered samples are now needed to calculate the fraction of suspended solids.

where:

TSS = total suspended solids (mg/L)

Vf = the volume of sample filtered (L)

mfi = initial filter mass (mg)

mff = filter mass after drying (mg)

The sample was then placed in a muffle furnace to burn of the organic fraction. The remaining sample can be used to determine the volatile suspended fraction:

where

mfx = final filter mass (including crucible)(mg)

The FSS can be calculated as the difference between the TSS and the VSS

FSS = TSS - VSS

From this data, the remaining fractions can be determined:

DS = TS SS

VDS = VS VSS

FDS = FS FSS

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Copyright © 2000
Lizette R. Chevalier
James N. Craddock