Materiales de Construcción, Vol 55, No 279 (2005)

Ferrous sulphate mono and heptahydrate reduction of hexavalent chromium in cement: effectiveness and storability


https://doi.org/10.3989/mc.2005.v55.i279.197

J. L. Valverde
Universidad de Castilla-La Mancha, Spain

J. Lobato
Universidad de Castilla-La Mancha, Spain

I. Fernández
Universidad de Castilla-La Mancha, Spain

L. Marijuán
Universidad de Castilla-La Mancha, Spain

S. Pérez-Mohedano
Fertiberia Biotech, S. L., Spain

R. Talero
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Spain

Abstract


In Community legislation, substances containing hexavalent chromium are classified as carcinogenic, mutagenic and sensitizing. In cement, hexavalent chromium intensifies sensitization and may set off severe allergic reactions in workers in routine contact with the product, whether in the factory or on construction sites. The allergic or contact dermatitis causes is a very painful disease that may lead to permanent worker disability. According to Directive 2003/53/EC of the European Parliament and the Council, Governments of all member countries will be required to prohibit the marketing and use, as of 17 January 2005, of any cement or cement preparation containing more than 2 ppm of chromium (VI). Hexavalent chromium can be reduced with ferrous sulphate to trivalent chromium, which is water-insoluble and therefore innocuous to the skin. The present paper reports the effects of adding ferrous sulphate mono- or heptahydrate to a commercial cement and the storage time of the mix on the concentration of hexavalent chromium. The salts studied were found to effectively reduce hexavalent chromium in cement for at least three months.

Keywords


cement; hexavalent chromium; contact dermatitis; ferrous sulphate; mono or heptahydrate

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