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Related Concept Videos

Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

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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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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...
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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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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...
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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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Related Experiment Video

Updated: May 1, 2026

Quantifying the Binding Interactions Between CuII and Peptide Residues in the Presence and Absence of Chromophores
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Colorimetric solid-phase extraction method for Cu(II) ion determination using 2-hydroxybenzaldehyde benzoylhydrazone

Estrella Espada-Bellido1, Maria Dolores Galindo-Riaño, Manuel García-Vargas

  • 1Department of Analytical Chemistry, Faculty of Sciences, University of Cadiz, P.O. Box 11510, Campus Río S. Pedro, Puerto Real, Cadiz 11510 Spain.

Applied Spectroscopy
|April 4, 2014
PubMed
Summary

A novel colorimetric sensor efficiently detects copper(II) ions in water samples within minutes. This rapid, on-site method uses a reagent immobilized on disks, changing color upon copper ion binding.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Copper(II) ions are significant environmental pollutants.
  • Accurate and rapid detection methods for copper are crucial for water quality monitoring.
  • Existing methods may be time-consuming or require complex laboratory setups.

Purpose of the Study:

  • To develop a new, rapid, and user-friendly colorimetric sensor for the determination of copper(II) ions.
  • To immobilize a selective colorimetric reagent (2-hydroxybenzaldehyde benzoylhydrazone) onto styrenedivinylbenzene disks.
  • To optimize and validate the sensor's performance for on-site water analysis.

Main Methods:

  • A two-step sensing procedure involving ion extraction and diffuse reflectance measurements.
  • Optimization of the sensing system using a fractional factorial design (3(3-1)) considering pH, immobilization time, and ligand amount.
  • Utilizing diffuse reflectance spectroscopy at 400 nm for quantitative analysis.

Main Results:

  • The sensor demonstrated a color change from white to green in the presence of copper(II) ions.
  • Optimal conditions were determined as pH 7, 10 min immobilization time, and 6.25 mg of ligand.
  • A linear calibration graph was obtained for copper(II) concentrations from 0 to 2.5 mg L(-1) with a detection limit of 0.21 mg L(-1).
  • The method showed good precision (RSD of 4.87% at 1 mg L(-1)) and minimal interference from common inorganic salts and other metals.

Conclusions:

  • The developed sensor offers a simple, rapid, and effective method for on-site copper(II) ion determination.
  • The immobilized reagent on styrenedivinylbenzene disks provides a stable and sensitive platform for colorimetric analysis.
  • This technique is suitable for routine monitoring of copper in water samples, contributing to environmental protection efforts.