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 1313.    HALE, C. H.  Rapid Analysis of Fischer Synthesis Catalyst.  Petrol Refiner, vol. 25, No. 6, 1946, pp. 117-120.

       Describes methods that have been found most satisfactory for the determining Co and Th in Fischer synthesis catalyst.  The procedure for Co involves titration in an ammoniacal solution with K₃Fe(CN)₆.  The end point is detected by means of the dead-stop technic.  The method is very rapid and accurate and is not subject to interference by any of the other materials commonly associated with Co.  Th is precipitated as the iodate.  The Th(IO₃)₄ is dissolved, reacted with iodide, and the liberated iodine titrated with thiosulfate (Na₂S₂O₃).  The method is more rapid and equally as accurate as the gravimetric method involving precipitation of thorium oxalate.