Loss on Ignition (Refer IS 1727: 1967, Clause5.3, Page No.8 - attached)
- Ignite I.00 g of the air-dried, finely ground sample in a platinum crucible of 20 to 25 ml capacity by placing it in a muffle furnace at 1000 f 25°C to constant weight ( for about 20 to 30 minutes ). Air should have free access to the sample to maintain oxidizing conditions.
- Cool and weigh the crucible to 0.1 mg and check the loss in weight by second heating for 5 minutes and reweighing after cooling.
- The percentage loss on ignition nearest to 0.1 shall be calculated as follows:
Loss on ignition, percent = A/B x 100
where, A = loss in weight, and
B = weight of moisture-free sample used.