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Chem. J. Chinese Universities ›› 1983, Vol. 4 ›› Issue (5): 605.

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NMR STUDY ON THE HYDRATION OF IONS IN MICROEMULSION——BIS-2-ETHYLHEXYL PHOSPHORIC ACID-ALCOHOL- KEROSINE-WATER MICROEMULSION SYSTEM

Wu Jinguang1, Gao Hongcheng1, Chen Dian1, Jin Tianzhu1, Xu Guangxian1, Sun Xianyu2, Zhang Shuizhen2, Wu Huaju2, Wang Changjin2   

  1. 1. Department of Chemistry, Peking University, Beijing;

    2. Institute of Photographic Chemistry, Academic Sinica, Beijing
  • Received:1982-03-10 Online:1983-10-24 Published:1983-10-24

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Abstract: In the present investigation we have observed the proton shift of water of hydration of metal ions in a microemulsion formed by adding water gradually from 0.05% to 20.0% to a moisture free bis-2-ethylhexyl phosphoric acid-alcohol-kerosine system saponified by metallic sodium, so that the ratio of concentrations (M+)/(H2O) can be varied from 100:1 to 1:100. Under such conditions we have obtained the limits of H2O (M+) for various cations as follows. 6.76ppm (NH4+), 6.60(Li+), 5.96 (Na+), 5.40(K+), while the proton shift of liquid water is H2O = 4.80 ppm. The half widths of NMR peaks in the organophosphoric acid extractant system are much wider than those of naphthenic acid system reported in ( Ⅰ ). This may be explained that the organophosphoric acid anion is also hydrated in addition to the cation.

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