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The following procedure is for use with a LECO Induction Furnace, Model 521 with Automatic Sulfur Titrator, Model 532. Other similar or advanced models of this instrumentation may perform equally well; however, the following procedure will require detailed modifications by a qualified person for application to other instruments. 3.2.4.3 Chemicals— I. Iron chip accelerator (Leco number 501-077). 2. Iron powder accelerator (Leco number 501-078). 3. Copper ring (Leco number 550-189). 4. Magnesium oxide (Mg0). 5. Potassium iodate (KI03) , 0.0052 N: Dissolve 1.110 g KI03 in distilled water and dilute to 1 liter. '- 6. Hydrochloric acid (HC1) solution: Dilute 15 ml of concentrated HC1 to a volume of 1 liter With distilled water. 7. Arrowroot starch solution: Dissolve 4.0 g of arrowroot starch (Leco number 501-061) in 100 ml of distilled water in a 250 ml beaker. Stir on a mechanical stirrer with a stirring bar. While starch is stirring, boil • 300 ml of distilled and deionized water in a 600 ml beaker. Remove from heat when boiling point id reached. Remove starch from stirrer. Place boiled crater on mechanical stirrer with stirring bar. While water is continually stirring, add 5 ml of starch mixture in 20 second intervals until all starch solution has been added. 'lace a small amount of the solution in the 600 ml beaker back into the 250 ml beaker that contained the starch mixture. Wash beaker by hard swirling and then pour contents back into the 600 ml beaker. Continue stirring solution in the 600 ml beaker ` allowing solution to cool to 40°C. Add 12.0 g of potassium iodide (KI). r Continue stirring for 15 to 20 minutes. • 8. Potassium iodide (ICI) . k 9. Sulfur standards (Leco number 501-502). 1 3.2.4.4 Materials— I. Leco Automatic Sulfur Analyzer, package unit, number 634-700. 2. Scoops, 0.2 ml volume. 3. Ceramic crucibles with porous covers. 4. Carboys, 19 liters (5 gal). 5. Tohgs. 52 4