The difference between the total solids and the total dissolved solids will give the total suspended solids. The dishes with the residue retained after completion of the tests for total solids and total dissolved solids are subjected to heat for 1 hour in a muffle furnace held at 550�C. The increase in weight over that of the ignited empty vessel represents fixed solids in each instance.
The difference between the total dissolved/total suspended solids and the corresponding fixed solids will give volatile solids in each instance. All the quantities should be expressed in mg/L. Settleable matter in surface and saline waters as well as domestic and industrial wastes may be determined and reported on a volume basis as millilitre per litre.
1. Porcelain evaporating dishes of 150-200 mL capacity
2. Steam bath
3. Drying oven
5. Analytical balance or monopan balance
6. Filter paper (preferably of glass fibre)
7. Electric muffle furnace
8. Imhoff cone
(a) Total solids
(e) Total volatile solids = Total solids - Total fixed solids.
(f) Fixed dissolved solids
(h) Fixed suspended solids = Total fixed solids - Fixed dissolved solids.
(i) Volatile suspended solids = Total volatile solids - Volatile dissolved solids.
(j) Settleable solids by volume
4. mg/L total suspended solids = mg/L of total solids - mg/L of total dissolved solids
5. mg/L total volatile solids = mg/L of total solids - mg/L of total fixed solids
7. mg/L volatile dissolved solids = mg/L total dissolved solids - mg/L of fixed dissolved solids
8. mg/L fixed suspended solids = mg/L total fixed solids - mg/L fixed dissolved solids
9. mg/L volatile suspended solids= mg/L total volatile solids - mg/L volatile dissolved solids
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