A Direct Method for Determining Sulfur in Carbon Materials by Atomic Emission Spectrometry with an Arc Excitation Source

Emission spectrometry with an argon arc source, ensuring the significant suppression of interferences with the molecular spectrum of CN, is used for the rapid direct determination of sulfur in pure graphite powders. A method of the time selection of the analytical signal of sulfur at the line 921.286 nm is proposed (signal registration within a certain interval of 9.8 s). The limit of detection for sulfur is 5 × 10–4 wt %. The analytical range is 5 × 10–4–2 × 10–2 wt % and can be expanded to 1 wt %. The time of a single analysis (3 replicate measurements) is 10 min. The work was performed on an MS-300 compact spectrometer, efficient in the range 908–930 nm, with an S13496 diode array photodetector.