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Related Concept Videos

Coagulation01:06

Coagulation

1.6K
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Factors Affecting Solubility04:01

Factors Affecting Solubility

37.7K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
37.7K
Colloidal precipitates01:09

Colloidal precipitates

6.7K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Related Experiment Video

Updated: Mar 8, 2026

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria
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How do operating conditions affect As(III) removal by iron electrocoagulation?

Caroline Delaire1, Susan Amrose1, Minghui Zhang1

  • 1Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720-1710, United States.

Water Research
|February 5, 2017
PubMed
Summary

Iron electrocoagulation (Fe-EC) effectively removes arsenic from groundwater. Optimizing iron dosage, oxygen recharge, and pH is key for efficient, low-cost arsenic water treatment.

Keywords:
ArsenicComputational modelIron electrocoagulationOperating conditionsSynthetic Bengal groundwaterpH

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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Chemical Engineering

Background:

  • Iron electrocoagulation (Fe-EC) is a cost-effective method for removing arsenic from contaminated groundwater.
  • Optimizing Fe-EC performance requires understanding the influence of operating conditions like pH, iron dosage, and oxygen recharge rates.

Purpose of the Study:

  • To investigate the combined effects of pH, iron dosage rate, and oxygen recharge rate on arsenic removal during Fe-EC.
  • To identify the rate-limiting step in arsenic removal (As(III) oxidation vs. As(V) adsorption) across different pH values.
  • To assess the model's predictions against experimental data under realistic, pH-drifting conditions.

Main Methods:

  • Improved an existing computational model to simulate Fe-EC processes.
  • Analyzed the impact of varying pH, iron dosage, and oxygen recharge rates on arsenic removal efficiency.
  • Conducted laboratory experiments to validate model predictions, allowing for pH drift.

Main Results:

  • The effect of iron dosage on arsenic removal is significantly influenced by pH and oxygen recharge rate.
  • The study identified whether As(III) oxidation or As(V) adsorption limited arsenic removal at various pH levels.
  • Model predictions showed robustness when validated against experiments simulating natural pH fluctuations.

Conclusions:

  • Operating conditions critically impact Fe-EC performance for arsenic removal.
  • A nuanced understanding of these interactions can guide the optimal operation of Fe-EC technology for safe drinking water.
  • This research provides insights for deploying Fe-EC in diverse groundwater conditions.