The CHNS mode for elemental analysers determines total carbon, hydrogen, nitrogen and sulphur simultaneously from 0.01% (0.05% for sulphur) to high percentage levels. It is ideal for the analysis of most sulphur compounds and is widely used in the analysis of soils, sludges and plant material. As with the CHN method the analysis for CHNS is limited to relatively small sample weights because the resolution of the nitrogen and carbon peaks. Where sulphur is required at levels of less than 0.05% the sulphur method should be selected which allows the use of even larger samples or the more sensitive flame photometric detector (FPD).
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