ISO 1994:1976 pdf download

01-24-2021 comment

ISO 1994:1976 pdf download. Hard coal — Determination of oxygen content.
This International Standard follows methods developed by Schuitze, Unterzaucher and Oita and Conway for the direct determination of the oxygen content of organic compounds. Modifications have been incorporated to avoid errors due to the presence of moisture in coal. Oxygen is evolved (as water and carbon dioxide) from the mineral matter associated with the coal when the sample is pyrolysed and, to reduce errors from this source, coals containing more than 5 of ash and all samples of unknown characteristics should be demineralized before analysis (see ISO 602).
1 SCOPE AND FIELD OF APPLICATION
This International Standard specifies semi-micro methods for the direct determInation of the oxygen content of hard coal.
2 REFERENCES
ISO 331, Coal -Determination of moisture in the analysis sample- Direct gravimetric method.
ISO 348, Hard coal- Determination of moisture in the analysis sample – Direct volumetric method.
ISO 602, Coal- Determination of mineral matter.
3 PRINCIPLE
The sample is dried at 105 to 110°C in a stream of itrogen and then pyrolysed under conditions in which th organic matter leaves an oxygen-free char. The volatile products, containing the organically bound oxygen and also water and carbon dioxide from any mineral matter, are decomposed with either pure carbon or platinized carbon to convert the oxygen to carbon monoxide. The carbon monoxide is oxidized to carbon dioxide and determined b a titrimetric or a gravimetric procedure.
4 REAGENTS
4.1 Nitrogen
The nitrogen used for the pyrolysis shall not contain more than 10 ppm of oxygen. If nitrogen of this purity is available commercially, further purification is not necessary if the total”blank””is within the limits specified in clause 7.
4.2 Alternative reagents for converting the volatile pyrolysis products to carbon monoxide
4.2.1 Pure carbon, particle size 0,7 to 2,0 mm ash content not exceeding 0, 01%.
The carbon shall be ignited to dull red heat in an inert atmosphere to remove any oil before being placed in the pyrolysis tube.ISO 1994:1976 pdf download.

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