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EDTA: Indirect and Alkalimetric Titration01:23

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Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
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The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Precipitation Titration: Endpoint Detection Methods01:19

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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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Dynamic Electrochemical Measurement of Chloride Ions
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Direct alkalinity detection with ion-selective chronopotentiometry.

Majid Ghahraman Afshar1, Gastón A Crespo, Xiaojiang Xie

  • 1Department of Inorganic and Analytical Chemistry, University of Geneva , Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland.

Analytical Chemistry
|May 29, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel sensor for direct pH and alkalinity measurement using an ion-selective membrane and applied current. The method shows promise for in situ determination of P-alkalinity in various samples.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Environmental Science

Background:

  • Accurate measurement of pH and alkalinity is crucial for water quality assessment.
  • Traditional methods for alkalinity determination can be time-consuming and require laboratory settings.

Purpose of the Study:

  • To develop a single sensor capable of directly measuring both pH and alkalinity.
  • To assess the feasibility of using chronopotentiometry with an ion-selective membrane for alkalinity determination.

Main Methods:

  • Utilized a polypropylene-supported liquid membrane doped with specific ionophores and electrolytes.
  • Employed an applied anodic current to induce hydrogen ion flux and monitored pH changes over time.
  • Correlated the transition time of the potential readout to base concentration using numerical simulations.

Main Results:

  • Successfully measured pH at zero current and alkalinity via chronopotentiometry.
  • Established a linear relationship between the square root of transition time and base concentration (0.1-1 mM).
  • Demonstrated analytical usefulness by measuring P-alkalinity in a river sample.

Conclusions:

  • The proposed sensor offers a direct and potentially in situ method for determining P-alkalinity.
  • The approach shows promise for application in diverse environmental matrices.
  • Further development could lead to a valuable tool for water quality monitoring.