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Chemosphere

Title:		"Experimental device for dioxin vapour generation: a steady and adjustable source of gaseous 2,3-DCDD"
Author(s):		Bonvalot L; Mercury M; Zerega Y;
Address:		"LISA-EA 4672, Aix-Marseille Univ, Centre de Saint Jerome, 13397 Marseille Cedex 20, France. LISA-EA 4672, Aix-Marseille Univ, Centre de Saint Jerome, 13397 Marseille Cedex 20, France; ADEME, 20 avenue du Gresille, 49004 Angers, France. LISA-EA 4672, Aix-Marseille Univ, Centre de Saint Jerome, 13397 Marseille Cedex 20, France. Electronic address: yves.zerega@univ-amu.fr"
Journal Title:		Chemosphere
Year:		2014
Volume:		20140104
Issue:
Page Number:		48 - 54
DOI:		10.1016/j.chemosphere.2013.12.013
ISSN/ISBN:		1879-1298 (Electronic) 0045-6535 (Linking)
Abstract:		"PCDD/Fs are Persistent Organic Pollutants (POPs), generated by incomplete combustion of carbonaceous and chlorinated compounds. Because of their toxicity, they have to be monitored at emission, from stationary sources like waste incinerator. In the framework of the development of an on-line analyser, the laboratory prototype requires a gaseous dioxin source. We detail the principles of a dynamic generator based on the sublimation of solid sample and on the diffusion method. Such a device has to supply a polluted flow at steady and adjustable concentration of dioxin. The dioxin generation rate is determined by the weight loss of the solid sample. It is constant during time for temperatures ranging between 75 and 100 degrees C and for generation flow rates greater than or equal to 50 mL min(-1). Variation of generation rate with temperature is predictable. With the increasing of temperature, emitted concentration increases while the increase of the inlet pressure decreases the concentration. Helium carrier gas leads to a higher generation rate than with N2 in agreement with mass and molecular volume ratio. Thus, the outlet concentration and flow rate can be settled independently in the range of 3-100 ppm and 50-200 mL min(-1)"
Keywords:		Dioxins/analysis/*chemistry Environmental Monitoring/*instrumentation Hazardous Substances/analysis Volatilization Dioxins Gas diffusion Solid sample sublimation Standard vapour generation;
Notes:		"MedlineBonvalot, Lise Mercury, Maud Zerega, Yves eng Evaluation Study Research Support, Non-U.S. Gov't England 2014/01/09 Chemosphere. 2014 May; 102:48-54. doi: 10.1016/j.chemosphere.2013.12.013. Epub 2014 Jan 4"