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A gas-free electrodialytic pH modifier for ion chromatography

机译：离子色谱无气体电渗量pH改性剂

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摘要

We for the first time describe a gas-free electrodialytic pH modifier deployed at the pump outlet side to manipulate carbonate eluent used for ion chromatography (IC). It is in sandwich configured, in which the central eluent channel is spatially isolated from two outer regenerant chambers by a stacked cation exchange membranes (sCEM) and a bipolar membrane (BPM) plus a stacked anion exchange membranes (sAEM) (BPM-sAEM), the cation exchange side of BPM is facing the central channel (the cathode direction). One electrode is put in each regenerant chamber and the sCEM side is cathode with respect to the anode of BPM-sAEM side. When a potassium carbonate eluent is pumped into the central channel and a DC current is applied, a controlled amount of potassium ions will be removed by migrating across sCEM into cathodic chamber. Meanwhile, hydronium ions generated from enhanced water splitting at the intermediate layer of BPM will electromigrate into central channel to form bicarbonate. By controlling the current, the potassium carbonate eluent can be manipulated to obtain a mixed eluent with different ratio of carbonate and bicarbonate. At least 10 mM K2CO3 eluent can be online changed modified into 10 mM KHCO3 with near-ideal Faradaic efficiency (∼92%). The device demonstrated good reproducibility, as indicated by retention time of relative standard deviation (RSD) < 0.43% and the peak area of RSD <0.93%.
机译：我们首次描述在泵出口侧部署的无空气电渗量，以操纵用于离子色谱（IC）的碳酸盐洗脱液。它在夹层中构造，其中中央洗脱通道通过堆叠的阳离子交换膜（SCEM）和双极膜（BPM）和双极膜（BPM）加上堆叠阴离子交换膜（SAEM）（BPM-SAEM）的空间上分离出来。 ，BPM的阳离子交换侧面向中心通道（阴极方向）。将一个电极放入每个再生室中，并且SCEM侧相对于BPM-SAEM侧的阳极是阴极。当碳酸钾洗脱液泵入中央通道并且施加DC电流时，通过将SCEM迁移到阴极室中，将除去受控量的钾离子。同时，从BPM的中间层的增强水分裂产生的散水离子将被电迁移到中央通道中以形成碳酸氢盐。通过控制电流，可以操纵碳酸钾洗脱液以获得具有不同碳酸酯和碳酸氢盐的不同比例的混合洗脱液。至少10 mm K2CO3洗脱液可以在线改变为10 mm KHCO3，具有近乎理想的野蛮效率（〜92％）。该器件显示出良好的再现性，如相对标准偏差的保留时间（RSD）<0.43％，峰面积为RSD <0.93％。

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