Accurate sampling of PCDD/F in high temperature flue-gas using cooled sampling probes
2012 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 88, no 7, 832-836 p.Article in journal (Refereed) Published
In a laboratory-scale combustion reactor, flue-gas samples were collected at two temperatures in the post-combustion zone, 700 °C and 400 °C, using two different water-cooled sampling probes. The probes were the cooled probe described in the European Standard method EN-1948:1, referred to as the original probe, and a modified probe that contained a salt/ice mixture to assist the cooling, referred to as the sub-zero probe. To determine the efficiency of the cooling probes, internal temperature measurements were recorded at 5 cm intervals inside the probes. Flue-gas samples were analyzed for polychlorinated dibenzo-p-dioxin and dibenzofurans (PCDD/Fs). Samples collected at 700 °C using the original cooling probe showed higher concentrations of PCDD/Fs compared to samples collected using the sub-zero probe. No significant differences were observed between samples collected at 400 °C. The results indicated that artifact formation of PCDD/Fs readily occurs during flue-gas sampling at high temperatures if the cooling within the probe is insufficient, as found for the original probe at 700 °C. It was also shown that this problem could be alleviated by using probes with an enhanced cooling capacity, such as the sub-zero probe.
Although this may not affect samples collected for regulatory purposes in exit gases, it is of great importance for research conducted in the high-temperature region of the post-combustion zone.
Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 88, no 7, 832-836 p.
Polychlorinated dibenzo-p-dioxins, Polychlorinated dibenzofurans, Quenching, Sub-zero cooling probe, Waste combustion
IdentifiersURN: urn:nbn:se:umu:diva-54601DOI: 10.1016/j.chemosphere.2012.03.090OAI: oai:DiVA.org:umu-54601DiVA: diva2:524350
Available online 28 April 20122012-05-022012-05-022014-09-03Bibliographically approved