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Citation: Zhang Fengjun, Ma Genxiang, Li Deqian, Wu Yonglie, Liu Lie. Study on Ammonium Ion Transfer in Hollow Fiber Membrane Extraction by on Line Flow Injection[J]. Chinese Journal of Applied Chemistry, ;1999, 16(4): 58-61. shu

Study on Ammonium Ion Transfer in Hollow Fiber Membrane Extraction by on Line Flow Injection

1.
a Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;
2.
b Jilin Commercial College, Changchun

Received Date: 1 February 1999
Available Online: 4 May 1999
Fund Project: 国家攀登计划稀土基础研究,国家自然科学基金资助项目(29771028) (29771028)

Ammonium ion selective electrode and flow analysis are combined to determine ammonia in the hollow fiber membrane extraction of Er(Ⅲ) and Yb(Ⅲ) with ammoniated HBTMPP(bis(2,4,4-trimethylpentyl)phosphonic acid). At the optimum conditions of analysis: concentration of NaOH 0.02 mol/L, stagant time 90 s there is a linear response from 2.0×10^-5 to 1.0×10^-1 mol/L for ammonium ion. In this method only 0.5 mL feed solution is needed instead of 3.0 mL in classical method and the sampling rate is 15/h. The H⁺ still transfers first in feed solution of high pH when ammoniated HBTMPP is used and the pH value of the feed solution decreases quickly. Then a mixing exchange between H⁺ and NH₄⁺ occurs. The pH of the feed solution keeps constant owing to the buffer formation in it. The same ion transfer behavior is found when extraction and stripping are carried out simuetaneously.
- flow injection analysis,
- ammonium ion selective electrode,
- hollow fiber membrane extraction,
- rare earth,
- mass transfer
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