Objective
Chlorobiphenyls (CB) are a class of 209 discrete chemical compounds in which between 1 and 10 chlorine atoms are attached to the biphenyl nucleus. Routine determination of every CB in each sample to be analysed would be prohibitive on a cost of time basis, thus a selection of congeners to be determined was made on the basis of their presence in industrial mixtures, occurrence in a vast number of environmental samples and toxicity. The following CBs were thus chosen: 28, 52, 101, 118, 153 and 180 for certification in a sewage sludge reference material (CRM). Accurate determinations are required for: checking of maximum allowable concentration (MAC values) in raw products and food; identification of pollution sources and for the detection of time trends in environmental pollution.
Because of the difficulty of determining CB congeners, the project started by a study of the various individual steps of the procedure of determination (eg quantification, identification, gas chromatography (GC) separation and GC injection, clean up, concentration and extraction) used by each of the participants. In consecutive collaborative tests these procedures were studied and the sources of error were detected and consequently eliminated. Analytical feasibility studies were conducted with a variety of materials before the contents of sewage sludge was certified.
Chlorobiphenyls (cb's) are a class of 209 discrete chemical compounds in which between one to ten chlorine atoms are attached to the biphenyl nucleus.
The risk to the environment and man of the use of polychlorinated biphenyls (transformer fluids and fluids for hydraulic systems, paper and ink industry, etc.) has for long been underestimated. Large quantities of pcb-mixtures have been produced and are still in use. However, toxicological studies on individual chlorinated biphenyls (cb's) indicate that these compounds are toxic and have both carcinogenic and teratogenic properties in animals.
Since a routine determination of approaching this number of components in each sample to be analysed would be prohibitive on a cost of time basis, a selection of congeners to be determined was made on the basis of their presence in industrial mixtures, occurrence in a vast number of environmental samples and toxicity of the particular congeners; these considerations have also led to legislation in some Member States.
The following cb's (IUPAC-numbers) were thus chosen: 28, 52, 101, 118, 153 and 180 for certification in a sewage sludge RM.
Accurate determinations are required for : checking of MAC-values (MAC = maximum allowable concentration) in raw products and food; identification of pollution sources and for the detection of time trends in environmental pollution.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences earth and related environmental sciences environmental sciences pollution
- natural sciences chemical sciences inorganic chemistry halogens
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
AB11 9DB Aberdeen
United Kingdom
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