Use the following data for calculating total solids (TS). volatile solids (VS),

Question

Use the following data for calculating total solids (TS). volatile solids (VS), dissolved solids (DS), total suspended solids (TSS), and total volatile suspended solids (TVSS). A sample volume of 200 ml was used in performing all solids analyses. Tare mass of evaporating dish 25.334g Mass of evaporating dish plus residue after evaporation @ 105°C 25.439 g Mass of evaporating dish plus residue after ignition @ 550°C25.385 g Mass of Whatman filter and tare 1.5103 g Mass of Whatman filter and tare after drying @ 105 C 1.5439 g Residue on Whatman filter and tare after ignition @ 550°C= 1.5199 g

Explanation / Answer

total solid (TS) = TSS + DS

TS = (((weight of dish+residue)-weight of dish)*1000)/mL sample

= 105 mg *1000/200mL

= 525 mg/L

TSS = (Total suspended solids are retained on a filter and weighed )
= ((weight of filter + dried residue - weight of filter)mg*1000)/mL sample

= 168 mg/L

TDS =( ((weight of the dried residue + dish )-(weight of dish)mg)*1000)/mL sample

= 255 mg/L

{Total dissolved solids are solids dissolved in the solution that passes through the filter.}

[They remain after drying an aliquot of the filtered solution.]

To calculate VS, the filter used for TSS is ignited at 550 °C.

The weight lost on ignition of the solids represents the VS value, (1.6mg*1000)/200mL = 18 mg/L

TVSS is the

                mg volatile solids/L = ((A – B) X 1000)/ sample volume, mL

where,

A represents the weight of residue + dish before ignition, mg, and

B represents the weight of residue + dish or filter after ignition, mg

TVSS = ((105-51) mg*1000)/200mL

= 250 mg/L

in terms of filter paper calculation,

TVSS = ((33.6-1.6) mg*1000)/200mL

= 270 mg/L

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