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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( H B T M P P)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 Na O H 浓 度为 002m ol/ L,响应 保留时 间为 90 s 时,铵 离子 标准 曲线 在20 ×10 - 5 ~1 0 ×10 - 1 m ol/ 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30 m L 降至05 m L;样品测 定频率可达15 次/ h . 当 H B T M P P 被氨化后 ,在高 p H 范围 内,氢离子 的传 质仍 优先 于铵 离子 ,p H 值 下降很快; 然后是 H+ 、 N H+4 的 混合交换 ,料液相 形成缓冲 体系,p H 值 基本不变 . 同级 萃取反萃 中,也有基本相 同的传 质规律
Ammonia gas sensing electrode combined with flow injection analysis was used to extract ytterbium from the aqueous solution of bis (2,4,4-trimethylpentyl) phosphonic acid (H B T M P P) The ammonium ion of the erbium process was analyzed online. The results showed that when the Na O H concentration was 002 mol / L and the response retention time was 90 s, the standard curve of ammonium ion was between 2 × 10 -5 ~ 1 × 10-1 mol / L ammonium ion Concentration range, with a good linear relationship. The amount of sample solution was reduced from 3 0 m L to 0 5 m L by the conventional electrode method. The frequency of sample determination was up to 15 times / h. When H B T M P P is aminated, the mass transfer of hydrogen ions still takes precedence over the ammonium ions in the high p H range, and the p H value decreases rapidly; followed by a mixed exchange of H +, N H + 4, The formation of buffer system, p H value basically unchanged. The same level of extraction and stripping, there are basically the same mass transfer law