This International Standard specifies an alternative method of determining the total sulfur content of hard coal, brown coal, and lignite by high-temperature combustion and infrared (IR) absorption using commercially available instruments. This method has been shown to be applicable to coal samples having an ash yield of less than 40 %.
GSO ISO 19579:2013 history
2013GSO ISO 19579:2013 Solid mineral fuels - Determination of sulfur by IR spectrometry