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Suspended solids
Step 1: Weigh a piece of filter paper (of a suitable size and grade) and record the weight.
Step 2 : Filter a set volume of the water through the filter paper.
Step 3: Dry the filter paper
Step 4: Weigh the filter paper (and solid) and report weight.
Step 5: Dry the filter paper again.
Step 6: Re-weigh filter paper and solids and report weight.
Step 7: Check the two weights are the same.
The following gives an example of the calculations required:
Volume of water sample filtered
Weight Filter Paper (before test)
Example
100mL
1.236g
Weight Filter Paper (after test)
Weight Filter Paper (after 2 nd drying)
1.307g
1.307g
Weight Suspended Solid= weigh of filter paper after 2 nd drying - weight of filter paper before test
Weight Suspended Solid = 1.307 – 1.236 = 0.071g
Suspended Solid = 0.071g in 100mL
= 0.710g in 1000mL (1L)
= 710 mg.L
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Worksheet 2 – Gravimetric tests Page 1 of 3

Suspended solids
Example
Volume of water sample filtered
Weight Filter Paper (before test)
Weight Filter Paper (after test)
Weight Filter Paper (after 2 nd drying)
Weight Suspended Solid= weigh of filter paper after 2 nd drying - weight of filter paper before test
Weight Suspended Solid
Suspended Solid
Total solids
Step 1: Conduct a suspended solids test and calculate the volume of suspended solids.
Step 2: Weigh an evaporating dish and record the weight.
Step 3: Place a volume of water into the dish.
Step 4: Heat the water to boiling point and allow the water to evaporate. Take care as the water boils to avoid ‘spitting’ which may cause some of the solid to escape (and also cause a hazard for the lab technician).
Step 5: When the water has boiled off, cool the evaporating dish
Step 6: Weigh the evaporating dish with the remaining solids.
The following gives an example of the calculations required:
Volume of water sample filtered
Weight Suspended Solid (from previous test)
100mL
= 0.071g (from 100mLs)
Weight evaporating dish (before test) 10.g
Weight evaporating dish (after test) 10.0018g
Weight dissolved solid = Weight evaporating dish (after test) - weight of evaporating dish before test
Weight dissolved solid = 10.00180 - 10 = 0.00180g
Total solid = dissolved solid + suspended
Total solids = 0.00180 + 0.071
= 0.00890 in 100mL
= 0.890g in 1000mL (1L)
= 890 mg.L
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Worksheet 2 – Gravimetric tests Page 2 of 3

Total solids
Volume of water sample filtered
Weight Suspended Solid (from previous test)
Weight evaporating dish (before test)
Weight evaporating dish (after test)
Weight dissolved solid = Weight evaporating dish (after test) - weight of evaporating dish before test
Weight dissolved solid
Total solid = dissolved solid + suspended
Total solids
Worksheet 2 – Gravimetric tests Page 3 of 3