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Related Experiment Videos

Method comparison study for weak acid dissociation cyanide analysis.

Joseph D Evans1, Leslie Thompson, Patrick J Clark

  • 1Science Applications International Corporation, 950 Energy Drive, Idaho Falls, Idaho 83401, USA. evansjo@saic.com

Environmental Science & Technology
|March 13, 2003
PubMed
Summary
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Comparing two cyanide analysis methods, modified EPA method 1677 using a Perstorp analyzer showed improved accuracy and precision over Standard Method 4500 CN I, especially for challenging mine-tailing samples.

Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry

Background:

  • Standard Method 4500 CN I and EPA draft method 1677 are used for analyzing weak acid dissociable (WAD) cyanide.
  • Both methods have shown analytical flaws and matrix interference issues in previous studies.

Purpose of the Study:

  • To compare the analytical performance of EPA draft method 1677 (Perstorp 3202 CN analyzer) against Standard Method 4500 CN I.
  • To identify and address analytical challenges, including matrix interferences, in WAD cyanide analysis.

Main Methods:

  • Method comparison using real-world mine-tailing solutions with high cyanide and metal concentrations.
  • Modification of procedural steps within EPA draft method 1677 to enhance performance.
  • Analysis conducted over a 90-day period using a large sample base.

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Main Results:

  • The Perstorp analyzer, utilizing modified EPA method 1677, yielded more precise and accurate results compared to Standard Method 4500 CN I.
  • Sulfide interferences and high concentrations of WAD metals were identified as key factors causing inconsistencies.

Conclusions:

  • Modified EPA draft method 1677 with the Perstorp analyzer offers a more reliable method for WAD cyanide analysis in complex matrices.
  • Addressing specific interferences is crucial for accurate WAD cyanide determination in environmental samples.