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Extraction: Advanced Methods00:56

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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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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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Updated: Sep 13, 2025

Laser-induced Breakdown Spectroscopy: A New Approach for Nanoparticle's Mapping and Quantification in Organ Tissue
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Rapid Heavy Metals Detection Using LIBS with Concentration Gradient Generators.

Xinrui Pan1, Yuanchao Liu2, Weiliang Wang3

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|July 28, 2025
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Summary
This summary is machine-generated.

A new microfluidic-based concentration gradient generator (CGG)-laser-induced breakdown spectroscopy (LIBS) platform enables rapid, on-site heavy metal detection in water. This automated system simplifies sample preparation, offering accurate and sensitive results for real-time environmental monitoring.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Spectroscopy

Background:

  • Surface water contamination by heavy metals poses significant risks to ecosystems and human health.
  • Traditional methods like ICP-MS are unsuitable for on-site monitoring due to complexity and cost.
  • Laser-induced breakdown spectroscopy (LIBS) offers rapid, in situ analysis but requires laborious manual sample preparation for quantification.

Purpose of the Study:

  • To develop an automated microfluidic-based concentration gradient generator (CGG)-LIBS platform for real-time, on-site quantification of heavy metals in water.
  • To overcome the limitations of manual sample preparation in existing LIBS methods for field applications.

Main Methods:

  • Fabrication of a 3D-printed microfluidic CGG device for automated generation of linear concentration gradients.
  • Integration of the CGG device with LIBS for simultaneous gradient generation and elemental analysis.
  • Application of standard addition calibration for accurate quantification of trace heavy metals (Ba, Cu, Mn).

Main Results:

  • The CGG device generated precise linear concentration gradients (R² > 0.998).
  • CGG-LIBS demonstrated stable, accurate, and sensitive quantification of Ba, Cu, and Mn with low limits of detection (LoDs) meeting Chinese standards.
  • Validation using natural water samples (Yangtze River, East Lake) showed excellent agreement with ICP-MS (<5% relative error).

Conclusions:

  • The developed CGG-LIBS platform provides a simplified, efficient, and reliable method for on-site heavy metal detection in water.
  • This technology holds significant promise for real-time environmental monitoring and water quality assessment.
  • The automated approach minimizes errors and contamination, enhancing the practicality of LIBS for field use.