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of the Laboratory Analyst to ensure that all conditions laid down in the method are met
and strictly adhered to. Any deviations from the prescribed method shall be recorded and
supervisor notified.
4. Equipment
4.1 Incineration dish.
4.2 Analytical electronic balance, accurate to 0.1 mg.
4.3 Muffle Furnace, capable of maintaining temperatures to 550 ± 20 °C.
4.4 Desiccator.
5. Reagents
None.
6. Procedure
6.1 Dry incineration dish (4.1) at 103 °C for at least 2 hours, remove from oven and cool
in a desiccator.
6.2 Weigh the empty dish (4.1) to the nearest 0.1 mg (W1).
6.3 Add approximately 5 g of sample to the dish and weigh to the nearest 0.1 mg (W2).
6.4 Place the dish in preheated muffle furnace at 550 ± 20 °C (4.3) for 3 hours.
6.5 Inspect visually if the residue is free from carbonaceous particles (see remark 9.1).
6.6 Transfer dish into a desiccator (4.4) and allow to cool to room temperature (approximately
45 minutes).
6.7 Weigh the dish to the nearest 0.1 mg (W3).
7. Calculation
Percent Ash (% ASH):
% ASH = (W3 – W1) x 100 / (W2 – W1)
where,
W1 = weight of empty dish (g),
W2 = weight of the dish and sample (g), and
W3 = weight of dish and residue after incineration (g).
