Related Experiment Video
Updated: Jan 22, 2026
Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
Published on: February 23, 2017
A bipolar membrane-based cation electrolytic membrane suppressor for ion chromatography.
Lili Zhao1, Yifei Lu1, Feifang Zhang1
1Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China.
A novel bipolar membrane (BPM)-based cation electrolytic membrane suppressor (CEMS) for ion chromatography offers comparable performance to existing suppressors. This ion chromatography suppressor avoids potential anion exchange membrane degradation in alkaline conditions.
Area of Science:
- Analytical Chemistry
- Electrochemistry
Background:
- Ion chromatography requires effective suppression of eluent conductivity for sensitive detection.
- Conventional suppressors can face challenges like membrane degradation in alkaline environments.
Purpose of the Study:
- To develop and evaluate a novel bipolar membrane (BPM)-based cation electrolytic membrane suppressor (CEMS) for ion chromatography.
- To assess the performance and stability of the BPM-CEMS compared to conventional systems.
Main Methods:
- A sandwiched CEMS configuration utilizing a BPM and an anion exchange membrane (AEM).
- Hydroxide ion generation via enhanced water splitting at the BPM junction layer.
- Performance evaluation based on suppressed background conductivity and noise levels.
Main Results:
- The BPM-CEMS demonstrated suppressed background conductivity of approximately 0.38 μS/cm.
- A very low noise level of around 0.6 nS/cm was achieved, comparable to commercial suppressors.
- The design avoids potential electrochemically induced reductive deamination of the AEM.
Conclusions:
- The BPM-based CEMS is a viable alternative for ion chromatography suppression.
- This suppressor design offers comparable performance and enhanced stability by preventing AEM degradation.
More Related Videos
11:17Monitoring Changes in Membrane Polarity, Membrane Integrity, and Intracellular Ion Concentrations in Streptococcus pneumoniae Using Fluorescent Dyes
Published on: February 17, 2014
08:46Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
Published on: January 6, 2015
Related Concept Videos
02:54Ions as Acids and Bases
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
01:21The Resting Membrane Potential
03:08Electrolytes: van't Hoff Factor
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
01:16Introduction to Membrane Proteins
02:21Electrolyte and Nonelectrolyte Solutions
01:09Ion-Exchange Chromatography