引用本文:
张凤君, 马根祥, 李德谦, 吴庸烈, 刘烈. 用在线流动注射法研究膜基萃取过程中的铵离子传质规律[J]. 应用化学,
1999, 16(4): 58-61.
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.
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.
用在线流动注射法研究膜基萃取过程中的铵离子传质规律
摘要:
采用氨气敏电极结合流动注射分析法,对中空纤维膜器中氨化二(2,4,4-三甲基戊基)膦酸(HBTMPP)-庚烷体系萃取镱、铒过程的铵离子进行在线分析.结果表明,当NaOH浓度为0.02 mol/L,响应保留时间为90 s时,铵离子标准曲线在2.0×10-5~1.0×10-1 mol/L铵离子浓度范围内,具有良好的线性关系.样品溶液的用量由普通电极法的3.0 mL降至0.5 mL;样品测定频率可达15次/h.当HBTMPP被氨化后,在高pH范围内,氢离子的传质仍优先于铵离子,pH值下降很快;然后是H+、NH4+的混合交换,料液相形成缓冲体系,pH值基本不变.同级萃取反萃中,也有基本相同的传质规律.
English
Study on Ammonium Ion Transfer in Hollow Fiber Membrane Extraction by on Line Flow Injection
Abstract:
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.
-
-
扫一扫看文章
计量
- PDF下载量: 1
- 文章访问数: 920
- HTML全文浏览量: 48
下载:
