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Pressure assisted chelating extraction: a novel technique for digesting metals in solid matrices.

Adam K Wanekaya1, Sunnie Myung, Omowunmi A Sadik

  • 1Department of Chemistry, State University of New York at Binghamton, 13902-6016, USA.

The Analyst
|October 12, 2002
PubMed
Summary
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Pressure Assisted Chelating Extraction (PACE) offers a novel, safe, and rapid method for digesting metals in solid samples. This technique achieves high metal recovery comparable to traditional methods, using less solvent and time.

Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Traditional wet digestion methods for metal analysis often involve hazardous strong acids and lengthy procedures.
  • There is a need for safer, faster, and more efficient techniques for metal digestion in various solid matrices.

Purpose of the Study:

  • To introduce and validate a novel technique called Pressure Assisted Chelating Extraction (PACE) for metal digestion.
  • To demonstrate PACE's efficiency, safety, and speed compared to conventional methods.

Main Methods:

  • Solid samples are mixed with chelating agents in a stainless steel cell.
  • Metals are extracted using a programmed sequence of temperature (up to 200°C), pressure (up to 3000 psi), and time.
  • The PACE technique utilizes the capabilities of the ASE 200 system for controlled extraction.

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Main Results:

  • PACE achieved metal recovery equivalent to wet digestion, with recoveries for Pb, Mn, and Cu ranging from 80-101% (RSD < 5%).
  • The digestion process was completed rapidly, typically within 20 minutes, significantly reducing analysis time.
  • The method demonstrated a clean and safe operation, avoiding the use of concentrated mineral acids.

Conclusions:

  • PACE is an efficient, rapid, and safe alternative for metal digestion in solid samples.
  • The technique is suitable for diverse sample types including environmental, industrial, biological, and geological materials.
  • Advantages include non-destructive potential, automation, and elimination of hazardous mineral acids.