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E4F - SO4 - Combustion Infrared Detection

A 0.2 g sample is combusted in a resistance furnance at 550 °C in a pure oxygen environment. During combustion, sulphur-bearing elements are reduced, releasing sulphur, which binds with oxygen to form SO2. Sulphur is measured as a SO2 in the infrared cell. An Eltra CS-2000 used for analysis.

According to ASTM E1915 in regards to sulphide sulphur, “In the absence of sulphate forms of sulphur, total sulphur may be used to estimate the sulphide sulphur concentration.  The pyrolysis loss sulphur may be the best estimate of sulphide sulphur, particularly where the acid generation potential due to iron sulphides is desired.  The nitric acid loss method may be appropriate where the sulphide forms are primarily pyrite and marcasite and pyrrhotite is absent, since pyrrhotite may react with acid.  The sodium carbonate residual sulphur method is most appropriate where the concentration of metal sulphide minerals in addition to iron are desired in the absence of barite, alunite, jarosites, orpiment and realgar.”



Detection Limit




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