For the determination of trace quantities of sulfur in petroleum distillates an oxy-hydrogen burner of improved design followed by a heated quartz combustion tube gives rapid combustion, increased sulfur recovery, and the elimination of a potential explosion hazard.A unique twostage absorber-evaporator system, in addition to absorbing sulfur oxides, eliminates excess water of combustion and permits uninterrupted burning of large samples. The recovered sulfur is determined as the sulfate in the evaporated hydrogen peroxide absorbent by micro-titration with barium perchlorate in 80% alcohol using a mixed thorin-methylene blue indicator.An average standard deviation of 35 p.p.b. sulfur has been obtained when burning 50-ml. samples of synthetic benzene blends in the 50 to 400 p.p.b. range. Sulfur recoveries averaged 98% on a variety of known blends over a wide concentration range. The method is applicable to determination of sulfur up to 400 p.p.m. or more, burning smaller samples. Fifteen samples can be analyzed per man-day.

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