Rapid method of simultaneous determination of sulfur, calcium, and barium in lubricating oils by fluorescent X-ray

Organic microchemistry

“…and titrated the aluminum in the resulting solution complexometrically followed by the reduction of Ti(IV) with zinc amalgam and then titration with (NH4)2S04-Fe2(S04)3 solution. Hasegawa, Kajikawa, and Okamoto (100) developed an X-ray fluorescence procedure for sulfur, calcium, and barium in lubricating oils. The presence of sulfur significantly affected the results for the other two elements thus requiring calibration graphs using standards containing the same amounts of aromatic hydrocarbons and sulfur.…”