The assessment of the evasion of mercury from a mercuriferous shale deposit using both micrometeorological and dynamic chamber methods

G. Edwards*, P. E. Rasmussen, S. Ausma, P. Hazlewood, S. Steffan

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

1 Citation (Scopus)

Abstract

As part of a five year program to better quantify the emission of mercury vapour from natural geogenic sources a three week study was undertaken over a mercuriferous shale deposit. The mineralized shale studied, extends over vast areas of Northern Canada. The research was carried out over a three week period, summer 2001, in the Yukon Territories, Canada. The measurements were taken over an open shale outcropping with an average substrate concentration of 350 ppb. In addition, measurements were performed over the shale's natural overburden (i.e., moss). Concurrently, a gradient micrometeorological method and a dynamic chamber method were used to assess the mercury flux. The micrometeorological method has a flux detection limit (i.e., site specific) on the order of 1.7 ng m -2 h -1 while the chamber method allows for detecting the mercury flux as low as 0.1 ng m -2 h -1. Both methods are based on the Tekran® (model 2537A) mercury vapour analyzer. The experimental design includes the collection of related environmental correlates in order to evaluate controlling processes. The shale deposit studied offers the unique opportunity to compare, on average, the two methods as measurement conditions were ideal and the emission footprint were reasonably homogenous. The average emission rate for the measurement period obtained for the chamber method was 9.2± 0.5 compared to the micrometeorological techniques average rate of 7.4±0.7. The good agreement between the two methods raises the question: is this fortuitous or real? This paper presents the methodologies used and the data collected in the context of quantifying this source of mercury to the atmospheric environment.

Original languageEnglish
Title of host publicationConference Proceedings - Joint 2002 CSCE/ASCE International Conference on Environmental Engineering - An International Perspective on Environmental Engineering
EditorsW.H. Stiver, R.G. Zytner
Place of PublicationVienna
PublisherInternational Nuclear Information System (IAEA)
Pages673
Number of pages1
ISBN (Print)088955532X
Publication statusPublished - 2002
Externally publishedYes
EventJoint 2002 CSCE/ASCE International Conference on Environmetal Engineering - An International Perspective on Enviromental Engineering - Niagara Falls, Ont., Canada
Duration: 21 Jul 200224 Jul 2002

Other

OtherJoint 2002 CSCE/ASCE International Conference on Environmetal Engineering - An International Perspective on Enviromental Engineering
CountryCanada
CityNiagara Falls, Ont.
Period21/07/0224/07/02

Keywords

  • Air-surface exchange measurement
  • Dynamic chamber
  • Flux gradient
  • Gogenic sources of mercury to the atmosphere
  • Mercury flux
  • Micrometeorological method

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    Edwards, G., Rasmussen, P. E., Ausma, S., Hazlewood, P., & Steffan, S. (2002). The assessment of the evasion of mercury from a mercuriferous shale deposit using both micrometeorological and dynamic chamber methods. In W. H. Stiver, & R. G. Zytner (Eds.), Conference Proceedings - Joint 2002 CSCE/ASCE International Conference on Environmental Engineering - An International Perspective on Environmental Engineering (pp. 673). Vienna: International Nuclear Information System (IAEA).