Obiettivo
The group of polychlorinated dibenzo-p-dioxins (PCDD) and corresponding furanes, commonly called the dioxins contains some of the most toxic substances ever made by man. There has been little agreement in their analysis and so a collaborative project was set up to check the gas chromatography-mass spectrometry (GC-MS) procedures and as a result, various participants improved their methods consequently. The certification analyses of the dioxins in a fly ash extract have been performed. An intercomparison on extraction techniques for incinerator ash has been carried out, leading to the certification of the 12 most toxic 2,3,7,8-chlorinated dioxins in a representative fly ash.
The group of polychlorinated dibenzo-p-dioxins (PCDD) and corresponding furances, commonly called the "dioxins" contains some of the most toxic substances ever made by man. The group contains 210 substances of widely varying toxicity.
BCR-work is concentrated on the PCDD-species with chlorine atoms in the 2,3,7,8-configuration as these are most toxic (e.g. LD50 in guinea pigs of 2,3,7,8-TCDD is: 1 ug/g; this "dioxin" has been released mainly at the Seveso accident); 2,3,7,8-TCDD is of acute toxicity and mutagenic, teratogenic and cancerogenic effects have been described.
"Dioxins" come into the environment:
a) as by-products of industrial products such as, pentachlorophenol (wood preservative), herbicides, etc. and
b) through combustion processes e.g. pcb-containing, oils, waste incinerators.
As intercomparisons and disputes between industry and public authorities have shown that there is little agreement between analytical results the BCR has decided to start collaboration work, which, in view of the difficulties encountered in the analysis, is set up similarly to the work in the pcb-group (project 246) i.e. stepwise, verification of the individual steps of the anlaytical chain (quantification, identification, separation, injection, clean-up, extraction...)
Campo scientifico
Argomento(i)
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CSC - Cost-sharing contractsCoordinatore
2400 MOL
Belgio
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Partecipanti (18)
67056 Ludwigshafen
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51373 Leverkusen
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69390 Vernaison
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08034 BARCELONA
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56100 Pisa
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21020 Ispra
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2600 JA DELFT
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VERNEUIL EN HALATTE
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65232 Taunusstein
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NR4 7UQ Norwich
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87036 RENDE
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CB10 IXL Saffron Walden
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7400 AL DEVENTER
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02151 ESPOO OTANIENI
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1018 WV AMSTERDAM
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89081 ULM
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69390 Palaiseau
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