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Related Concept Videos

Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

580
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...
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Qualitative Analysis03:46

Qualitative Analysis

23.5K
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...
23.5K
Complexometric Titration: Overview00:39

Complexometric Titration: Overview

10.8K
Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
10.8K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.1K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.1K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.0K
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...
1.0K
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

5.1K
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...
5.1K

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Related Experiment Video

Updated: Jan 3, 2026

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
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Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

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Metal Cation Detection in Drinking Water.

Johnson Dalmieda1, Peter Kruse1

  • 1Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada.

Sensors (Basel, Switzerland)
|November 28, 2019
PubMed
Summary
This summary is machine-generated.

Monitoring water quality is crucial for human health. This review examines various sensing methods for detecting important cations like lead and mercury in water, focusing on mobile technologies.

Keywords:
cationschemical sensorsheavy metalsleadmercurywater quality

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Water Quality Monitoring

Background:

  • Human activities increasingly strain freshwater resources and water quality.
  • Accurate water quality monitoring is essential for public health and environmental protection.
  • Cation detection is vital as some are beneficial while others are toxic.

Purpose of the Study:

  • To review lab-based and field-based methods for cation detection in water.
  • To assess the selectivity and sensitivity of these methods for water monitoring.
  • To highlight advancements in mobile sensing technologies for water analysis.

Main Methods:

  • Optical methods (absorbance, fluorescence).
  • Electrical methods (potentiometry, voltammetry, chemiresistivity).
  • Mechanical (quartz crystal microbalance) and spectrometric (mass spectrometry) techniques.
  • Focus on mobile sensing and microfluidics.

Main Results:

  • Comprehensive overview of diverse cation detection techniques.
  • Evaluation of methods for specific cations: barium, cadmium, chromium, copper, hardness (calcium, magnesium), lead, mercury, nickel, silver, uranium, and zinc.
  • Identification of trends in developing sensitive and selective water sensors.

Conclusions:

  • Various analytical techniques exist for monitoring critical water cations.
  • Mobile sensing technologies, including microfluidics, show promise for on-site water quality assessment.
  • Continued development of efficient sensors is necessary for safeguarding water resources.