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Improvement of the determination of fluoride and chloride in clay

Objective



The clay materials used in the brick industries are currently monitored to avoid air and ground water pollution. Some areas suffer from a severe pollution by emission of fluoride into the atmosphere and its subsequent transport into the ground water as clay may contain 200 to 1200 ug/g of F. As an example, the brick and ceramic industry is responsible for 50% of the total F emission in The Netherlands. The emissions are calculated from the difference in the F content of clay and the final product (brick). Chloride is responsible for corrosion and has to be determined to assess this risk. Problems have been observed during baking of clay. In some cases, raw materials are rejected if the Cl and F contents are too high which cause an economic concern. As a consequence, many European countries have implemented legislations for the maximum authorised values in gaseous emission of F and Cl from brick industries, which strongly stresses the need for the control of the quality of measurements and therefore for the production of reference materials.

Status:
Certification to be concluded by the end of 1992 (candidate CRM 461)

Coordinator

Netherlands Energy Foundation
Address
3,Westerduinweg
1755 ZG Petten
Netherlands

Participants (14)

Bundesanstalt für Materialforschung und Materialprüfung
Germany
Address
Unter Den Eichen 87
12205 Berlin
Centre National de la Recherche Scientifique (CNRS)
France
Address

69390 Vernaison
Faelleskemikerne/Elsam Soenderijyllands Hoejspaendingsvaerk
Denmark
Address
185,Flensborgvej
6200 Aabenraa
I.N.W. - Univeristeit Gent
Belgium
Address
86,Proeftuinstraat
9000 Gent
INSTITUT NATIONAL DE L'ENVIRONNEMENT INDUSTRIEL ET DES RISQUES
France
Address
Parc Technologique Alata
Verneuil En Halatte
Ministère des Affaires Economiques
Belgium
Address
17A,rue De La Senne
1000 Bruxelles
Ministère des Affaires Economiques
Belgium
Address
17A,rue De La Senne
1000 Bruxelles
RW-TÜV - Anlagentechnik GmbH
Germany
Address
Langemarckstraße 20
45141 Essen
Ruhrkohle AG
Germany
Address
Wilhelmstraße 98
44649 Herne
Stazione Sperimentale per i Combustibili SpA
Italy
Address
Viale A De Gasperi 3
20097 San Donato Milanese
Technisch Centrum voor de Keramische Industrie
Netherlands
Address
8,Hoofdstraat 8
6904 AE De Steeg
UNIVERSITY OF PLYMOUTH
United Kingdom
Address
Drake Circus
Plymouth
Universidad de Oviedo
Spain
Address
8,C/ Julían Clavería
33006 Oviedo
VTT Technical Research Centre of Finland
Finland
Address
7,Biologinkuja
02150 Espoo