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) m_{ci} = initial crucible mass (mg) m_{cf} = 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) m_{cx} = 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) V_{f} = the volume of sample filtered (L) m_{fi} = initial filter mass (mg) m_{ff} = 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 m_{fx} = 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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