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Related Concept Videos

EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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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...
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Qualitative Analysis03:46

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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.
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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

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The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
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Precipitation of Ions03:11

Precipitation of Ions

28.1K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
28.1K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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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...
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Updated: Sep 18, 2025

A Polyaniline-based Sensor of Nucleic Acids
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DNA as a polyionic ionophore for barium sensor.

M M Zareh1, A F El-Farargy1, A Abd-ElSattar1

  • 1Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt.

BMC Chemistry
|June 19, 2025
PubMed
Summary

This study developed a novel barium ion (Ba2+) sensor using DNA as an eco-friendly ionophore. The sensor shows high selectivity and sensitivity for accurate Ba2+ detection in various real-world samples.

Keywords:
Barium determinationCoated wireDNA-based sensor

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Multi-analyte Biochip MAB Based on All-solid-state Ion-selective Electrodes ASSISE for Physiological Research
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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Barium ion (Ba2+) detection is critical for industrial, environmental, and biological applications.
  • Existing sensors often lack the required selectivity and sensitivity for accurate Ba2+ monitoring.
  • Development of novel, eco-friendly, and highly efficient Ba2+ sensors is an ongoing research priority.

Purpose of the Study:

  • To develop a novel coated wire barium-selective electrode using DNA as a natural, eco-friendly ionophore.
  • To enhance sensor selectivity and sensitivity for precise Ba2+ detection.
  • To evaluate the sensor's performance, including response time, pH tolerance, selectivity, and applicability in real samples.

Main Methods:

  • Fabrication of a plastic membrane electrode incorporating DNA as the ionophore and dioctyl phthalate as the plasticizer.
  • Electrochemical characterization of the sensor, including potentiometric measurements to determine selectivity and sensitivity.
  • Material characterization using Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX).
  • Validation of the sensor's practical applicability by analyzing spiked real-world samples (milk, juice, tap water, urine).

Main Results:

  • The DNA-based sensor demonstrated a high sensitivity with a slope of 33.15 mV/decade over a broad concentration range (1 × 10⁻⁵ to 1 × 10⁻² M).
  • The sensor exhibited a rapid response time of 9 seconds and a wide pH tolerance (2.6-6.9).
  • Excellent selectivity for Ba2+ over other cations was observed, with high recovery rates (96.07-98.9%) in spiked real samples.

Conclusions:

  • DNA serves as an effective and eco-friendly ionophore for developing highly selective and sensitive barium ion-selective electrodes.
  • The developed sensor offers a promising advancement in ion-selective electrode technology for accurate and reliable Ba2+ detection.
  • This DNA-based sensor has significant potential for practical applications in environmental monitoring, industrial process control, and biological analysis.