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Related Concept Videos

Masking and Demasking Agents01:19

Masking and Demasking Agents

4.1K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
4.1K
Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

819
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...
819
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

4.1K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
4.1K
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

6.5K
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...
6.5K
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

1.6K
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
1.6K
Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

5.1K
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...
5.1K

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Related Experiment Video

Updated: May 5, 2026

Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores
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Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores

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Rhodamine B-Modified Carbon Dots with EDTA Masking Strategy for Selective Detection of Cu²⁺.

Xiaoli Wu1, Jiajia Du2, Dandan Zhang1

  • 1College of Basic Medical Sciences, Guizhou University of Traditional Chinese Medicine, Guiyang, 550025, China.

Journal of Fluorescence
|May 4, 2026
PubMed
Summary

This study developed a novel fluorescent probe using carbon dots and rhodamine B for detecting iron (Fe³⁺) and copper (Cu²⁺) ions. The probe offers a sensitive and selective method for analyzing these metal ions in environmental samples.

Keywords:
Carbon dotsCu²⁺ detectionEDTARatiometric fluorescenceRhodamine BSelective masking

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TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples
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TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples

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Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
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Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution

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TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples
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Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
07:00

Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Iron(III) and copper(II) ions are prevalent environmental contaminants with potential health risks.
  • Rapid and accurate detection methods for these ions are crucial.

Purpose of the Study:

  • To develop a ratiometric fluorescent probe for simultaneous and selective detection of Fe³⁺ and Cu²⁺.
  • To utilize biomass-derived carbon dots (CDs) and rhodamine B (RhB) for enhanced probe performance.

Main Methods:

  • Fabrication of a ratiometric fluorescent probe by integrating CDs with RhB.
  • Utilizing the coordination interaction between Fe³⁺/Cu²⁺ and CDs for fluorescence changes.
  • Employing ethylenediaminetetraacetic acid (EDTA) as a masking agent for selective Cu²⁺ detection.

Main Results:

  • The probe demonstrated rapid fluorescence response to Fe³⁺ and Cu²⁺.
  • RhB provided a stable reference signal for self-calibration, reducing interferences.
  • EDTA enabled selective detection of Cu²⁺ in the presence of Fe³⁺.
  • High sensitivity (4.91 µM) and accuracy (97.3%-99.5% recovery) were achieved for Cu²⁺ in water samples.

Conclusions:

  • The developed probe is a green, sensitive, and reliable tool for detecting Cu²⁺ in complex matrices.
  • The strategy of using a masking agent (EDTA) effectively resolves interference issues in multi-analyte detection systems.