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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...
EDTA: Indirect and Alkalimetric Titration01:23

EDTA: Indirect and Alkalimetric Titration

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...
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.
In the Volhard method, a standard excess of AgNO3 is first added to the...
Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides and...
Controlled-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...

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Semi-automated potentiometric titration method for uranium characterization.

B F G Cristiano1, J U Delgado, J W S da Silva

  • 1Comissão Nacional de Energia Nuclear (CNEN), Instituto de Radioproteção e Dosimetria (IRD), Avenida Salvador Allende s/n Recreio dos Bandeirantes, PO Box 37750, Rio de Janeiro, 22780-160 RJ, Brazil. barbara@ird.gov.br

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

A new semi-automatic potentiometric titration method reduces analysis time and analyst influence for uranium compound characterization. This method, traceable to a primary standard, achieves a combined standard uncertainty of approximately 0.01% for uranium concentration.

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Area of Science:

  • Analytical Chemistry
  • Nuclear Chemistry

Background:

  • Potentiometric titration is a standard method for uranium compound analysis.
  • Manual titration methods are time-consuming and prone to analyst variability.

Purpose of the Study:

  • To develop a semi-automatic potentiometric titration method.
  • To reduce analysis time and minimize analyst influence in uranium determination.
  • To ensure traceability and high accuracy in uranium characterization.

Main Methods:

  • Development of a semi-automatic potentiometric titration system.
  • Application of the method using a potassium dichromate primary standard for traceability.
  • Validation of the method for uranium compound analysis.

Main Results:

  • The semi-automatic method significantly reduces analysis time compared to manual titration.
  • The method demonstrates high precision with a combined standard uncertainty of around 0.01% for total uranium concentration.
  • Traceability was successfully established using a potassium dichromate primary standard.

Conclusions:

  • The developed semi-automatic potentiometric titration method is efficient and reliable for uranium characterization.
  • The method's low uncertainty makes it suitable for certification and precise uranium analysis.
  • This advancement offers improved accuracy and reduced operational variability in nuclear material analysis.