18.104.22.168 TM-27, Determination of Calcium Oxide and Magnesium Oxide in Hydrated Lime
This method determines the non-volatile content of hydrated lime and the percentages of calcium oxide and magnesium oxide in that non-volatile.
22.214.171.124.1 Reagents and Apparatus
(a) Platinum Crucible, 20-30 ml volume, with cover
(b) Reagents and Apparatus as described in EPG 126.96.36.199 TM-26, Determination of Calcium Carbonate and Magnesium Carbonate in Lime and Pigment Materials.
188.8.131.52.2 Procedure for Non-Volatile
Weigh, to the nearest 0.1 mg, 1 g of the sample, and transfer to a tarred platinum crucible. Cover the crucible and place in an electric muffle furnace. Bring the furnace to a temperature of 1100-1150°C, and maintain at that temperature for about 15 minutes. Cool the crucible and residue in a dessicator, and weigh to the nearest 0.1 mg.
Calculate the non-volatile as follows:
- % Non-Volatile =
184.108.40.206.4 Procedure for Calcium Oxide and Magnesium Oxide
Determine the calcium and magnesium in the hydrated lime by the procedure described in EPG 220.127.116.11 TM-26, Determination of Calcium Carbonate and Magnesium Carbonate in Lime and Pigment Materials.
Make the following calculations:
- % CaO =
- % Calcium Oxide (CaO), based on Non-Volatile
- MgO =
- % Magnesium Oxide (MgO), based on Non-Volatile