The following is from a laboratory test to determine the suspended solids concen

Question

1. The following is from a laboratory test to determine the suspended solids concentration of a sample of untreated wastewater. A 100 mL sample is filtered through a filter pad that removes all the suspended solids. The dry and cool weight of the pad and crucible before filtration is 48.610 g. After filtration, drying, and cooling, the weight of the crucible, filter pad, and dried solids is 48.903 g. What is the concentration of suspended solids in the wastewater sample, expressed in mg/L? [2,930 mg/L]

Explanation / Answer

weight of suspended particles in 100mL = weight after drying and cooling filtration - weight before taken

= 48.903 - 48.610 = 0.293g

= 293mg in 100mL

so in 1L conc will be 293*1000/100 = 2930mg/L

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