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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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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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Colloidal precipitates01:09

Colloidal precipitates

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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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Qualitative Analysis03:46

Qualitative Analysis

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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Types of Coprecipitation01:10

Types of Coprecipitation

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Synthesis and Characterization of Fe-doped Aluminosilicate Nanotubes with Enhanced Electron Conductive Properties
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Mimetite Formation from Goethite-Adsorbed Ions.

Anna Kleszczewska-Zębala1, Maciej Manecki1, Tomasz Bajda1

  • 11Faculty of Geology, Geophysics and Environmental Protection,AGH University of Science and Technology,al. Mickiewicza 30, 30-059 Krakow,Poland.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|June 23, 2016
PubMed
Summary

Precipitating mimetite (Pb5(AsO4)3Cl) effectively immobilizes arsenic in contaminated sites. This study reveals mimetite nucleation is driven by reaction kinetics, not just thermodynamics, for arsenic remediation.

Keywords:
EBSDapatitearsenatedesorptionnucleation

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Materials Science

Background:

  • Arsenic contamination poses significant environmental and health risks.
  • Reducing arsenic bioavailability is crucial for effective remediation.
  • Mimetite (Pb5(AsO4)3Cl) precipitation is a promising method for arsenic immobilization.

Purpose of the Study:

  • To elucidate the reaction mechanisms of mimetite formation.
  • To investigate the role of goethite in arsenic and lead interactions.
  • To understand the kinetics of mimetite nucleation and crystallization.

Main Methods:

  • Studied reactions between lead ions and arsenate-adsorbed goethite (AsO4-goethite).
  • Investigated reactions between arsenate ions and lead-saturated goethite (Pb-goethite) in the presence of chloride.
  • Characterized reaction products using scanning electron microscopy, X-ray diffraction, and spectroscopy.

Main Results:

  • Rapid crystallization of mimetite was observed in both reaction pathways.
  • Mimetite formation kinetics were influenced by the desorption rates of arsenic and lead from goethite.
  • Heterogeneous and homogeneous mimetite crystallization mechanisms were identified based on reactant supply.

Conclusions:

  • Mimetite nucleation is primarily governed by the kinetics of reactant supply to the saturation front.
  • The study provides insights into the mechanisms of arsenic immobilization via mimetite precipitation.
  • Understanding these mechanisms is key to optimizing remediation strategies for arsenic-contaminated soils and wastes.