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Related Concept Videos

Potentiometric Titration: Overview01:31

Potentiometric Titration: Overview

Potentiometric titration is a quantitative analytical technique that determines the concentration of an analyte by measuring the potential difference between the two electrodes in the solution. The endpoint of a potentiometric titration is the point at which there is a significant change in the potential difference. It occurs when the stoichiometric reaction between the analyte and the titrant is complete. The endpoint is usually determined graphically by plotting the measured potential...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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.
The chosen potential ensures...
Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

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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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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...
Atomic Absorption Spectroscopy: Lab01:21

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

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Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level
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Determination of SO(2) in Wines Using a Flow Injection Analysis System with Potentiometric Detection.

Araújo1, Couto, Lima

  • 1CEQUP/Departamento de Química Física, Faculdade de Farmácia (UP), Rua Aníbal Cunha 164, 4050 Porto, Portugal.

Journal of Agricultural and Food Chemistry
|February 7, 2001
PubMed
Summary

A new flow injection analysis system accurately determines sulfur dioxide (SO2) in wine. This method offers a reliable and efficient way to measure both free and total SO2 levels in various wine types.

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Area of Science:

  • Analytical Chemistry
  • Food Science
  • Environmental Science

Background:

  • Sulfur dioxide (SO2) is a crucial additive in winemaking, used for preservation and antioxidant properties.
  • Accurate determination of free and total SO2 is essential for wine quality control and regulatory compliance.
  • Existing methods for SO2 analysis can be time-consuming or require specialized equipment.

Purpose of the Study:

  • To develop and validate a novel flow injection analysis (FIA) system for the precise determination of free and total SO2 in wine.
  • To assess the performance of the developed FIA method against established analytical techniques.
  • To provide a rapid and efficient analytical solution for SO2 monitoring in the wine industry.

Main Methods:

  • Development of a flow injection analysis manifold incorporating a gas diffusion unit and a potentiometric detector.
  • Utilized a homogeneous crystalline iodide double-membrane tubular electrode for SO2 detection.
  • Employed a modified Ripper method involving iodide titration and separation via a Teflon diffusion membrane.

Main Results:

  • The proposed FIA method demonstrated good agreement with the rapid assay method recommended by the UE and OIV for both free and total SO2.
  • Relative error deviations between the FIA method and the reference method were consistently below 6%.
  • The system is suitable for SO2 concentrations ranging from 3.2 to 180 mg L(-1) and achieves high sample throughput (75-100 samples per hour).

Conclusions:

  • The developed flow injection analysis system provides an accurate, reliable, and efficient method for determining free and total SO2 in white and red wines.
  • This method offers a practical alternative to existing techniques, meeting the demands of routine wine analysis.
  • The high sample throughput and accuracy make this FIA system valuable for quality control in the wine industry.