- 作者: 王紹梅、李全民、白海鑫、劉國光
- 作者服務機構: College of Chemistry and Environmental Science, Henan Normal University, Key Laboratory of Environmental Science and Engineering of Education Commission of Henan Province, Xinxiang, Henan, 453002, P. R. China
- 中文摘要: The behavior and conditions of liquid-liquid extraction-separation of Fe(III) by ammonium thiocyanate-H2O-n-propyl alcohol system in the presence of NaCl were studied, and the possible reactive mechanism of extraction of Fe(III) was deduced. The study showed that, in the presence of a given amount of NaCl, phases were separated thoroughly between n-propyl alcohol and water. In the process of phase separation, the complex [Fe(SCN)n](3-n) formed by NH4SCN and Fe(III) was quantitatively extracted into the n-propyl alcohol phase. The extracted Fe(III) exists in the n-propyl alcohol phase mainly as the forms of Fe(SCN)2+ and Fe(SCN)3. Also, the relationship between extraction yield of Fe(III) and the amount of NH4SCN agreed well with the quadratic equation E = 0.54 + 58.14x - 8.39x2 (E and x represent the recovery rate of Fe(III) and the volume (mL) of 0.1 M NH4SCN respectively). The quadratic R-Square is 0.9990. With this method, Fe(III) can be completely separated from Co(II), Ni(II), Mn(II), Al(III), Bi(III) and Cd(II) at pH 1.0~2.0. The present method was applied in determining Fe(III) in samples with satisfactory results such as relative standard deviation from 2.06% to 2.89% and recovery rate in the range of 98.4~101.4%.
- 英文摘要: --
- 中文關鍵字: Ammonium thiocyanate; n-Propyl alcohol; Iron(III); Extraction separation.
- 英文關鍵字: --