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Related Experiment Videos

Comparison of methods for particulate phase mercury analysis: sampling and analysis.

Mary M Lynam1, Gerald J Keeler

  • 1University of Michigan Air Quality Laboratory, Ann Arbor, MI 48109, USA.

Analytical and Bioanalytical Chemistry
|November 30, 2002
PubMed
Summary

A new thermoreductive method for analyzing particulate mercury (Hg(p)) shows promise for routine monitoring. However, it yields lower results than microwave acid digestion and can be affected by reactive gaseous mercury (Hg(2+)(g)) artifacts.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Atmospheric Chemistry

Background:

  • Particulate mercury (Hg(p)) plays a key role in mercury deposition.
  • Current methods for Hg(p) analysis include microwave acid extraction and thermoreductive techniques.
  • Optimizing Hg(p) analysis is crucial for understanding mercury's environmental fate and transport.

Purpose of the Study:

  • To evaluate and optimize a thermoreductive method for routine analysis of particulate mercury (Hg(p)).
  • To compare Hg(p) results from thermoreductive analysis with microwave acid digestion.
  • To investigate the impact of reactive gaseous mercury (Hg(2+)(g)) on Hg(p) filter collection.

Main Methods:

  • Utilized pre-baked quartz filters in dichotomous samplers and microorifice impactors for Hg(p) collection.

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  • Employed a thermoreductive methodology for rapid analysis of collected Hg(p) samples.
  • Conducted experiments in Detroit, MI, USA, incorporating KCl-coated annular denuders to assess Hg(2+)(g) artifacts.

    • Main Results:

    • The thermoreductive method yielded 30% lower fine fraction Hg(p) and 56% lower coarse fraction Hg(p) values compared to microwave acid digestion.
    • Elevated reactive gaseous mercury (Hg(2+)(g)) in urban environments caused significant Hg(p) collection artifacts.
    • Filters collected downstream of denuders showed substantially less Hg(p) in the presence of Hg(2+)(g).

    Conclusions:

    • The thermoreductive method offers rapid analysis without chemical extraction, reducing contamination and hazardous waste.
    • Matrix interferents may reduce mercury collection efficiency onto gold traps in the thermoreductive method.
    • Utilizing upstream denuders is essential for accurate Hg(p) measurements by preventing Hg(2+)(g) artifacts.