“…who made the precision studies, many of the interference studies, and helped in the differential polarographic end-point studies; E. M. Kinderman, who helped with the pretreatment and interference studies and the early automatic titrations; W. W. Mills, who furnished the standards for the investigation; and Roy Ko and G. Meyer, who established the need for iron in the generation system. LITERATURE CITED (1) Carson, W. N., Jr., Anal. Chem., 25,226 (1953).…”