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Dithiocarbamate as a Releasing Agent in the Atomic- Absorption Determination of Noble Metals in Organic Media

D. J. NicolasE. A. Jones

出版	National Inst. for Metallurgy, 1976
ISBN	08699928139780869992814
URL	http://books.google.com.hk/books?id=4c9VMwEACAAJ&hl=&source=gbs_api

註釋

Dithiocarbamate, present as zinc dibenzyl dithiocarbamate, was investigated as a releasing agent to control the mutual interferences of the noble metals in organic media, and its application to organic extracts of the noble metals was then studied. This releasing agent is first shown to be effective in removing these interference effects in organic solutions consisting of a mixture of methyl isobutyl ketone (MIBK), methanol, and traces of hydrochloric acid. This additive becomes necessary because, although the extraction of the noble metals as a group can be made with S-(1-decyl)-N, N'-diphenyl isothiouronium bromide (DDTU)-MIBK or S-benzyl-N-ethyl-N'-hexyl isothiouronium bromide (BEHT)-MIBK, their back-extraction is difficult. The absence of interference was shown by comparison of the analysis of similar extracts of the individual noble metals. As an example of the use of this releasing agent, an account is given of the extraction into DDTU-MIBK of trace amounts of the noble metals from a sulphuric acid solution containing large amounts of base metals and their determination in the organic phase.