ASTM D1318 Test Method for Sodium in Residual Fuel Oil (Flame Photometric Method)
3. Summary of Test Method
3.1 A weighed sample is reduced to a carbonaceous ash under controlled conditions. The residual carbon is removed by heating in a muffle furnace at 550°C. The ash is dissolved, diluted to volume, and the sodium determined by means of a flame photometer.
4. Significance and Use
4.1 Excessive amounts of sodium can indicate the presence of materials that cause high wear of burner pumps and valves, and contribute to deposits of boiler heating surfaces.
