Critical evaluation of adsorption-based sampling of vaporized metal species in flue gases

Tiina Harju, Timo Laitinen, Mika Pärkkä, Hannu Revitzer, Inkeri Yliruokanen

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

Diffusion-controlled sampling techniques, i.e. diffusion screens and diffusion tubes (= denuders), can be used in the collection of several vaporized heavy metal species in clean gases (pure N2 atmosphere) at elevated temperatures. Collection efficiencies obtained for Hg, HgCl2, Cd, CdCl2 and ZnCl2 were over 90% using adsorption on Au-coated diffusion screens and Ag-coated denuders. However, the collection efficiencies for Zn and PbCl2 were significantly lower. In field measurements performed at a hazardous waste incineration plant and in a power plant equipped with a circulating fluidized-bed boiler, collection efficiencies seemed to vary noticeably depending on the sampling conditions and metal species to be sampled. Best collection efficiencies were obtained for mercury with both Ag coated denuders and Au coated screens whereas cadmium showed significantly poorer results in field measurements than in the laboratory. Sampling of zinc and lead species seemed to be problematic in all cases. Of the two sampling techniques, the denuder technique is more recommendable than the screen technique for sampling in relatively clean gases. However, neither of these techniques should be used in flue gases without further understanding of the collection mechanisms.

Original languageEnglish
Pages (from-to)801 - 805
Number of pages5
JournalFresenius' Journal of Analytical Chemistry
Volume357
Issue number7
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

Fingerprint

Flue gases
Adsorption
Gases
Metals
Sampling
Hazardous Waste
Incineration
Power Plants
Cadmium Chloride
Mercuric Chloride
Heavy Metals
Mercury
Cadmium
Atmosphere
Waste incineration
Zinc
Fluidized beds
Boilers
Power plants
Temperature

Cite this

Harju, Tiina ; Laitinen, Timo ; Pärkkä, Mika ; Revitzer, Hannu ; Yliruokanen, Inkeri. / Critical evaluation of adsorption-based sampling of vaporized metal species in flue gases. In: Fresenius' Journal of Analytical Chemistry. 1997 ; Vol. 357, No. 7. pp. 801 - 805.
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abstract = "Diffusion-controlled sampling techniques, i.e. diffusion screens and diffusion tubes (= denuders), can be used in the collection of several vaporized heavy metal species in clean gases (pure N2 atmosphere) at elevated temperatures. Collection efficiencies obtained for Hg, HgCl2, Cd, CdCl2 and ZnCl2 were over 90{\%} using adsorption on Au-coated diffusion screens and Ag-coated denuders. However, the collection efficiencies for Zn and PbCl2 were significantly lower. In field measurements performed at a hazardous waste incineration plant and in a power plant equipped with a circulating fluidized-bed boiler, collection efficiencies seemed to vary noticeably depending on the sampling conditions and metal species to be sampled. Best collection efficiencies were obtained for mercury with both Ag coated denuders and Au coated screens whereas cadmium showed significantly poorer results in field measurements than in the laboratory. Sampling of zinc and lead species seemed to be problematic in all cases. Of the two sampling techniques, the denuder technique is more recommendable than the screen technique for sampling in relatively clean gases. However, neither of these techniques should be used in flue gases without further understanding of the collection mechanisms.",
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Critical evaluation of adsorption-based sampling of vaporized metal species in flue gases. / Harju, Tiina; Laitinen, Timo; Pärkkä, Mika; Revitzer, Hannu; Yliruokanen, Inkeri.

In: Fresenius' Journal of Analytical Chemistry, Vol. 357, No. 7, 1997, p. 801 - 805.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Critical evaluation of adsorption-based sampling of vaporized metal species in flue gases

AU - Harju, Tiina

AU - Laitinen, Timo

AU - Pärkkä, Mika

AU - Revitzer, Hannu

AU - Yliruokanen, Inkeri

PY - 1997

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AB - Diffusion-controlled sampling techniques, i.e. diffusion screens and diffusion tubes (= denuders), can be used in the collection of several vaporized heavy metal species in clean gases (pure N2 atmosphere) at elevated temperatures. Collection efficiencies obtained for Hg, HgCl2, Cd, CdCl2 and ZnCl2 were over 90% using adsorption on Au-coated diffusion screens and Ag-coated denuders. However, the collection efficiencies for Zn and PbCl2 were significantly lower. In field measurements performed at a hazardous waste incineration plant and in a power plant equipped with a circulating fluidized-bed boiler, collection efficiencies seemed to vary noticeably depending on the sampling conditions and metal species to be sampled. Best collection efficiencies were obtained for mercury with both Ag coated denuders and Au coated screens whereas cadmium showed significantly poorer results in field measurements than in the laboratory. Sampling of zinc and lead species seemed to be problematic in all cases. Of the two sampling techniques, the denuder technique is more recommendable than the screen technique for sampling in relatively clean gases. However, neither of these techniques should be used in flue gases without further understanding of the collection mechanisms.

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