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28. Set "Titrate-Endpoint" to middle position. IMPORTANT: Record <br /> titration reading. <br /> 29. Lower sample platform, remove crucible using tongs, place fresh sample <br /> crucible in place, but do not close sample chamber. <br /> NOTE: Slightly drain titrating chamber to maintain original level. Drain, <br /> flush, and refill titrating chamber every 3rd sample, or more often if a <br /> large quantity of titrant was used by the previous sample (steps 16-22). <br /> 30. Refill KI03 buret. .' <br /> 31. Close sample chamber, making sure it is tight. Check endpoint (steps <br /> 18, 19 and 21). - <br /> 32. Go to step 23 and continue until all samples have been processed. <br /> 33. Turn "Titrate-Endpoint" switch to mid position. <br /> 34. Turn off main 02 valve on top of tank. <br /> �L <br /> 35. Turn off "High Voltage." <br /> 36. Turn off Automatic Titrator. <br /> 37. Drain titration chamber; flush twice with a chamber full of ECI solution <br /> or Water, cover and leave chamber full of HC1 solution. <br /> 38. If 02 has stopped bubbling in the purifying train, turn off small <br /> knurled valve on gauge outlet. <br /> 39. Turn off "Filament voltage." <br /> 3:2:4 6=Calculations— - <br /> - - 1.-Percent sulfur:NOTE¢ Percent sulfur is—dependent -upon the concentrar- <br /> -- tion of-potassium iodate titrant- and_sample size. -- T _T -- - --A. Using Using 1.110 g KI03/L and 0.500 g sample (0.005 - 1.00% sulfur range) <br /> %3- - Buret reading X 5.0. <br /> B. Using 1.110 g KI03/L and 0.250 g sample (0.010 - 2.00% sulfur range) <br /> %S - Buret reading X 10.0. <br /> C. Using 1.110 g KI03/L and 0.100 g sample (0.025 - 5.00% sulfur range) <br /> %S = Buret reading X 25.0. <br /> 2. To convert % sulfur to maximum CaCO3 equivalents: Multiply % sulfur <br /> by 31.25 to get tons CaCO3 equivalent/1000 tons of material. <br /> 55 <br />