Comparison of tubular polymeric pH and ammonium ion electrodes as detectors in the automated determination of ammonia.
Comparison of tubular polymeric pH and ammonium ion electrodes as detectors in the automated determination of ammonia.
复制标题
自动测定氨时管状聚合物 pH 电极和铵离子电极作为检测器的比较。
DOI：
10.1039/an9851000371
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
Meyerhoff,ME
中科院分区：
文献类型：
--
作者：
Lee,HL;Meyerhoff,ME
The analytical response properties of two types of flow-through ammonia gas sensing electrode systems are examined and directly compared under the same experimental conditions. Both detection systems involve the use of continous flow gas dialysis in conjuction with tubular polymer membrane electrode detectors. In one method, the pH of the flowing recipient stream leaving the dialyser is monitored; in the second, ammonium ions are detected. For each of five sample diluents studied, the latter method is shown to offer a greater than 100-fold improvement in detection limits over the more classical pH monitoring technique. Further studies clearly show that the ammonium electrode detection mode also offers superior selectivity over volatile amines (e.g., methylamine, ethylamine, etc.). The reasons for these enhanced analytical characteristics are discussed in terms of ammonia flux through the gas-permeable membrane of the dialyser and appropriate solution equilibria.
