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Online Gas-Free Electrodialytic KOH Eluent Generator for Ion Chromatography
Analytical Chemistry ( IF 6.7 ) Pub Date : 2018-10-02 00:00:00 , DOI: 10.1021/acs.analchem.8b03365 Yifei Lu 1 , Liting Zhou 1 , Bingcheng Yang 1 , Shujun Huang 1 , Feifang Zhang 1
Analytical Chemistry ( IF 6.7 ) Pub Date : 2018-10-02 00:00:00 , DOI: 10.1021/acs.analchem.8b03365 Yifei Lu 1 , Liting Zhou 1 , Bingcheng Yang 1 , Shujun Huang 1 , Feifang Zhang 1
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An online gas-free KOH electrodialytic eluent generator (EDG) with two-membrane configuration is described for ion chromatography (IC). A central eluent channel is separated from two outer regenerant channels bearing KOH solution (or one is water) by stacked cation-exchange membranes (sCEMs) and a bipolar membrane (BPM) plus stacked CEMs (BPM-sCEMs), in which the anion-exchange membrane (AEM) of BPM is facing the central channel (the anode direction). Independent fluid input or output ports address all channels. One platinum screen electrode is put in each outer channel, and the sCEM side is anode with respect to the cathode of the BPM-sCEM side. Under the electric field, enhanced water splitting at the intermediate layer of BPM will occur, offering hydroxide and hydronium; hydroxide electromigrates through AEM into the central channel, while the potassium of KOH feed solution at the anode migrates into the central channel to combine with hydroxide to form a solution of KOH. Because the central eluent channel is spatially isolated from both electrodes, the generated KOH solution is gas-free and no gas-removal device is required. More important, the AEM side of BPM is contactless with the alkaline solution, nearly avoiding possible AEM degradation when immersed into concentrated alkaline solution. This ensures long-term running stability of the EDG and high purity of the produced KOH solution (as indicated by the typical suppressed background conductance of 0.28 μS/cm). The EDG has a pressure tolerance (at least 21 MPa), and the produced KOH concentration is up to 101 μeq/min with near-unity faradaic efficiency. When operated in both isocratic and gradient modes, the EDG demonstrates excellent reproducibility, as indicated by the retention time of RSD ≤ 0.08% and the peak area of RSD ≤ 0.6%. To the best of our knowledge, this is the first description of gas-free EDG matched conventional IC system.
中文翻译：
离子色谱在线无气电渗析KOH洗脱液生成器
描述了一种用于离子色谱（IC）的具有两膜配置的在线无气KOH电渗析洗脱液生成器（EDG）。通过堆叠的阳离子交换膜（sCEM）和双极性膜（BPM）加上堆叠的CEM（BPM-sCEMs），中央洗脱液通道与两个带有KOH溶液（或一个是水）的外部再生剂通道分开，其中阴离子为BPM的交换膜（AEM）面向中央通道（阳极方向）。独立的流体输入或输出端口寻址所有通道。在每个外部通道中放置一个铂丝网电极，并且sCEM侧相对于BPM-sCEM侧的阴极为阳极。在电场作用下，BPM中间层会发生更多的水分解，产生氢氧化物和水合氢；氢氧化物通过AEM电迁移到中央通道，阳极处的KOH进料溶液中的钾迁移到中央通道中，与氢氧化物结合形成KOH溶液。因为中央洗脱液通道在空间上与两个电极均隔离，所以生成的KOH溶液不含气体，因此不需要除气装置。更重要的是，BPM的AEM一侧与碱性溶液不接触，几乎避免了AEM浸入浓碱性溶液中时可能发生的降解。这样可确保EDG的长期运行稳定性以及所生产KOH溶液的高纯度（如典型的0.28μS/ cm的抑制本底电导率所示）。EDG具有耐压性（至少21 MPa），产生的KOH浓度高达101μeq/ min，几乎具有法拉第效率。在等度和梯度模式下运行时，EDG表现出出色的重现性，如RSD的保留时间≤0.08％和RSD的峰面积≤0.6％所表明。据我们所知，这是无气体EDG匹配的常规IC系统的第一个描述。
更新日期：2018-10-02
中文翻译：
离子色谱在线无气电渗析KOH洗脱液生成器
描述了一种用于离子色谱（IC）的具有两膜配置的在线无气KOH电渗析洗脱液生成器（EDG）。通过堆叠的阳离子交换膜（sCEM）和双极性膜（BPM）加上堆叠的CEM（BPM-sCEMs），中央洗脱液通道与两个带有KOH溶液（或一个是水）的外部再生剂通道分开，其中阴离子为BPM的交换膜（AEM）面向中央通道（阳极方向）。独立的流体输入或输出端口寻址所有通道。在每个外部通道中放置一个铂丝网电极，并且sCEM侧相对于BPM-sCEM侧的阴极为阳极。在电场作用下，BPM中间层会发生更多的水分解，产生氢氧化物和水合氢；氢氧化物通过AEM电迁移到中央通道，阳极处的KOH进料溶液中的钾迁移到中央通道中，与氢氧化物结合形成KOH溶液。因为中央洗脱液通道在空间上与两个电极均隔离，所以生成的KOH溶液不含气体，因此不需要除气装置。更重要的是，BPM的AEM一侧与碱性溶液不接触，几乎避免了AEM浸入浓碱性溶液中时可能发生的降解。这样可确保EDG的长期运行稳定性以及所生产KOH溶液的高纯度（如典型的0.28μS/ cm的抑制本底电导率所示）。EDG具有耐压性（至少21 MPa），产生的KOH浓度高达101μeq/ min，几乎具有法拉第效率。在等度和梯度模式下运行时，EDG表现出出色的重现性，如RSD的保留时间≤0.08％和RSD的峰面积≤0.6％所表明。据我们所知，这是无气体EDG匹配的常规IC系统的第一个描述。
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