Two-Dimensional detection in ion chromatography: sequential conductometry after suppression and passive hydroxide introduction.
Two-Dimensional detection in ion chromatography: sequential conductometry after suppression and passive hydroxide introduction.
复制标题
离子色谱中的二维检测：抑制和被动氢氧化物引入后的顺序电导测定。
DOI：
10.1021/ac0105336
复制
发表时间：
2001
影响因子：
7.4
通讯作者：
R. L. Adams
中科院分区：
文献类型：
--
作者：
R. Al;P. Dasgupta;R. L. Adams
介绍了一种利用顺序抑制和非抑制离子对常见阴离子和极弱酸性阴离子进行灵敏检测的改进方法。在对电解生成的氢氧化物洗脱液和电解抑制器进行抑制电导检测后，将洗脱液送入膜装置，在膜装置中使用Donnan禁止泄漏将KOH被动地引入洗脱液中。然后，第二个电导率检测器测量水流的电导率。第二探测器的本底电导通常保持在20-30微米/厘米的相对较低水平。弱酸被转化为完全电离的钾盐，并在低KOH背景下作为负峰被检测到。研究了不同市售阳离子交换膜的适用性。所研究的器件配置包括平面、管状和灯丝填充的环形螺旋(FFAH)器件。FFAH装置能更有效地将穿透的氢氧化物与洗脱液混合，噪声水平为~lt；或=7 ns/cm，频带色散值小于82微L。给出了优化设计和性能数据。
An improved method that uses sequential suppressed and nonsuppressed IC for the sensitive detection of both common anions and very weak acid anions is described. After suppressed conductometric detection of an electrolytically generated hydroxide eluent and an electrolytic suppressor, the eluent is passed into a membrane device where KOH is passively introduced into the eluent stream using Donnan forbidden leakage. A second conductivity detector then measures the conductivity of the stream. The background conductance of the second detector is typically maintained at a relatively low level of 20-30 microS/ cm. The weak acids are converted to potassium salts that are fully ionized and are detected against a low KOH background as negative peaks. The applicability of different commercially available cation exchange membranes was studied. Device configurations investigated include planar, tubular, and a filament-filled annular helical (FFAH) device. The FFAH device provided more effective mixing of the penetrated hydroxide with the eluent stream, resulting in a noise level of < or = 7 nS/cm and a band dispersion value of less than 82 microL. Optimal design and performance data are presented.