Wstępne wyniki badań nad pochodzeniem siarki z wykwitów gipsowych powstających w budowlach zabytkowych Warszawy

Sulphates belong to the most frequent compounds found in deteriorated stone monuments. The sources of sulphur within urban agglomeration area are diverse. Many of them are characterised by different sulphur speciation. The aim of this study was to determine the origin of the sulphur from sulphate minerals, formed due to deterioration of daubed resistive wall in the Wilanów Park, mainly gypsum. The mineral phase composition as well as their chemical composition has been determined. The chemical composition of the salts is highly correlated with that of rainfall, which in turn seemed to influence the sulphur isotopic fractionation. Rainfall seems also to be the main source of sulphur. 34S for nine samples has been estimated. The data obtained show narrow value range. The data alone do not allow precise identification of the main source of sulphur in the sulphate minerals.