In recent years considerable attention has been devoted to the
problem of ammonia emission in the indoor space of buildings and
lodgings [1]. The main sources of this emission are different concrete
additives containing urea , which are used to improve the technical
characteristics of concrete at low temperatures. But,as soon as the
temperature and humidity increase , urea in these additives starts to
decompose and this causes the release of ammonia into indoor
spaces [1]. The source of ammonia is provided by the decomposition
of urea in aqueous medium to ammonium cyanate (NH4CNO) where
the cyanate anion can further decompose to ammonium and car-
bonate [2]. The presence of ammonia at high concentrations in
residential and office spaces will make them unsuitable for habitation or work.Therefore,it is essential to develop methods for assessing the potential of concrete and other building materials to
emit ammonia.