The analysis of sulfur in coal has been brought to the attention of the general public in recent years primarily as it concerns the pollution problem with coal-fired electric generation. Although our application is different, some of the results would be equally applicable to that circumstance. The Cement Division of Florida Mining and Materials Corporation produces annually about 500,000 tons of both Portland and Pozzolanic cements, using a coal-fired rotary kiln. The sulfur content of coal used in the manufacture of clinker ranges from traces to as much as 6%. Sulfur content in a dry process plant such as ours (this is the modern energy-efficient type of cement plant) is very critical, and in our case must be limited to 1.2% max.