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Sulphur for industrial use -- Determination of ash at 850-900 degrees C and of residue at 200 degrees C
Application to products containing at least 98 % of elemental sulphur, expressed as a percentage by mass, of the product dried at 80 °C for 2 h.
The difference between the ash and the residue corresponds to the "non-volatile bituminous matter" content at 200 °C.
The principle of ashing consists in slow combustion in air of a test portion of the dried product. Heating in a furnace, controlled at 850 °C to 900 °C, and weighing.
The determination of non-volatile matter is carried out by slow evaporation in a furnace, controlled at (200 ± 10) °C, in a flow of nitrogen, of the volatile matter and the sulphur.
Weighing of the residue after about 10 h.
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