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6. Glass wool. <br /> 7. Oxygen regulators. <br /> 8. Mechanical stirrer. <br /> 9. Stirring bar. <br /> 10. Combustion tube, hydrocarbon (Leco number 519--004). <br /> 11. Hot plate. <br /> 12. Balance, can be read to 0.001 g. <br /> 3.2.4.5 Procedure (revised and updated from Smith et al., 1974)-- <br /> NOTE: <br /> 970-- <br /> NOTE: Read entire manuals on Leco Furnace, Automatic Titrator and this <br /> entire procedure before starting. <br /> 1. Place one level scoop of iron chips in crucible. <br /> 2. Weigh 0.500 g of sample (less than 60 mesh) into the crucible. <br /> NOTE: For samples that are suspected to contain over 1% sulfur or have a <br /> 40 chroma of less than 2, see 3.2.4.2. - - <br /> 3. Add one scoop MgO. <br /> 4. Add one copper ring and then one scoop of iron powder. • <br /> 5. Gently shake the crucible to evenly cover the bottom and place one <br /> porous cover on the crucible. <br /> T - �6:Turn on "Filament Voltage" grid tap to medium position. <br /> ?. Wait for one minute then turn "High Voltage" switch to ON. <br /> -- 8. Set "Titrate-Endpoint" switch to its middle position. - -- - -� - - -- — --- T -� <br /> 9. Turn on titrator (upper left switch above "Endpoint Adjust"). <br /> 10. Drain "Titration Vessel" completely. <br /> 11. Set timer switch to ON, adjust timer to 10 minutes, or a time <br /> sufficient to satisfy steps 25, 26, and 27. <br /> 12. Slosh carboys containing HC1 and K103 to mix the condensate on the <br /> walls of the container. <br /> 3 <br /> J 13. Fill "iodate Buret." <br /> 53 <br />