New paramagnetic relaxation reagent for water-in-oil emulsions

✍ Scribed by E.L. Gogolashvili; N.G. Dzjubenko; N.P. Kuz'mina; B.Ya. Margulis; L.I. Martynenko

• Book ID: 103909864
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 246 KB
• Volume: 12
• Category: Article
• ISSN: 0730-725X
• DOI: 10.1016/0730-725x(94)91540-7

✦ Synopsis

The gadolinium(111) fl-diketonate complexes and their adducts with neutral iigands such as trlphenyiphosphine oxlde (TPPO), trioctyiphosphine oxide (TOPO), hexamethylphosphoramide (HMPA), and dimethyl suifoxide (DMSO) have been synthesized and examined as paramagnetic relaxation reagents in analysis of water-in-oil emulsions by the nuclear magnetic relaxation method. For all compounds the soiubility in water and n-hexane has been determined. The dipivaloyimethauate complex Gd(DPM)s *TOP0 (I) was found to show the best solubility in nhexane (0.05 moi/l) as well as practical insolubility in water. When added to a sample of hydrocarbons (n-hexane, benzene, kerosene, oil), (I) caused a general enhancement of spin-lattice relaxation rates of both aromatic and aliphatic protons. In the study of kerosene-water and oil-water emulsions, the addition of 0.05% (I) was associated with shorter organic proton relaxation times than those of water protons and hence the relaxation curves might be successfully resolved into two components. The results presented demonstrate that (I) can be used as a paramagnetic relaxation reagent to determine components in water-in-oil emulsions.