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Woods et al. 499removed the samples were prepared by first reducing the metal with 85 % hydrazinefollowed by dissolution <strong>of</strong> the metal in boiling aqua regia. The dissolved metal inaqua regia was diluted to 50 mL in deionized water. A Thermo Electron Corp.GENESYS 10S UV-Vis Spectrophotometer was used for Ru analysis.Concluding RemarksDeloxan ® THP II and MP Metal Scavengers are effective for removal <strong>of</strong> metalcontamination from process solutions, particularly in the development <strong>of</strong> APIs.Several factors such as temperature, solvent, oxidation state and nature <strong>of</strong> the metal,mode <strong>of</strong> operation as well as number <strong>of</strong> equivalents <strong>of</strong> scavenger among other thingsinfluence the effectiveness <strong>of</strong> these scavengers at reducing metal concentrations.Thus, these factors need to be considered when optimizing operating conditions formetal removal. Degussa provides the expertise and support in assessing technicalfeasibility and scale-up to commercial operations.AcknowledgementsA special thanks to Mobile Process Technology for pilot scale testing <strong>of</strong>Deloxan ® THP II and MP metal scavengers.References1. C. E Garrett, and K. Prasad, Adv. Synth. Catal.346, 889 (2004).2. Note for Guidance on Specification Limits for Residues <strong>of</strong> Metal Catalysts, TheEuropean Agency for the Evaluation <strong>of</strong> Medicinal Products: London, 17December 2002; http://www.emea.eu.int3. S. Wieland, E. Auer, A. Freund, H. L. Rotgerink, P. Panster, ChemicalIndustries (Dekker), 68, (Catal. Org. React.) 277-286 (1996).4. a) P. Panster, S. Wieland, EP 0415079 A1 to Degussa AG (1990); b) P. Panster,S. Wieland, EP 0416272 A1 to Degussa AG (1990).5. G. Cote, F. M. Chen, D. Bauer, Solvent Extraction and Ion Exchange, 9(2), 289–308 (1991).

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