Determination of total sulfur by x-ray fluorescence eliminates problems of incomplete oxidation of sulfur or coprecipitation often encountered in gravimetric analyses. Durable pellets are prepared from finely ground sample powders mixed with chromatographic cellulose. X-ray fluorescence total sulfur values compare well with gravimetric sulfur values.
Brent P. Fabbi and William J. Moore, "Rapid X-Ray Fluorescence Determination of Sulfur in Mineralized Rocks from the Bingham Mining District, Utah," Appl. Spectrosc. 24, 426-428 (1970)