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Electrolyte and Nonelectrolyte Solutions02:21

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Colligative Properties of Electrolytes
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In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
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Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...
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Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
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Chloride ions contribute to the osmotic pressure gradient distinguishing the intracellular fluid (ICF) from the extracellular fluid (ECF). They counterbalance positively charged ions in the ECF and ensure its electrochemical stability. The renal system's process of chloride absorption and release generally mirrors that of sodium ions.
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Modelling nanofiltration of electrolyte solutions.

Andriy Yaroshchuk1, Merlin L Bruening2, Emiliy Zholkovskiy3

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Summary

This review critically examines nanofiltration (NF) models for electrolyte solutions, highlighting limitations of nanopore models and proposing advanced engineering models for accurate ion transport prediction in NF membranes.

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Area of Science:

  • Physical Chemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Nanofiltration (NF) is crucial for separating ions from solutions.
  • Current models for NF of electrolyte solutions face limitations in accurately predicting ion transport.
  • Understanding these transport mechanisms is vital for optimizing NF performance.

Purpose of the Study:

  • To critically review and compare existing models for nanofiltration of electrolyte solutions.
  • To identify the strengths and weaknesses of different theoretical approaches, including nanopore and advanced engineering models.
  • To propose improved modeling strategies for predicting ion transport and membrane performance in NF.

Main Methods:

  • Application of linear irreversible thermodynamics and its continuous version to derive ion transfer equations.
  • Extension of the Spiegler-Kedem approximation for trace ion analysis.
  • Analysis of phenomenological coefficients in terms of ion partitioning, hindrance, and diffusion coefficients.
  • Evaluation of the Born formula and ion excess solvation energies for dielectric exclusion.
  • Review of advanced engineering models based on solution-diffusion-electromigration mechanisms.

Main Results:

  • Nanopore models exhibit limitations and predict trends not observed experimentally.
  • The Born formula is inadequate for describing dielectric exclusion in nanopores; ion excess solvation energies are more appropriate.
  • Advanced engineering models, considering transmembrane electric fields, better capture experimental observations.
  • Trace ions can be used to experimentally determine membrane permeance parameters.
  • Models incorporating ultrathin barrier layers and deviations from local electroneutrality show promise.

Conclusions:

  • Advanced engineering models are likely to dominate practical nanofiltration modeling due to their complexity and accuracy.
  • Mechanistic studies are essential, but future simulations may require moving beyond continuum models for deeper physical insight.
  • Improving control over concentration polarization in membrane test cells is crucial for enhancing modeling input quality.