Author(s)

KATERINA KREISLOVA, PAVLINA FIALOVA, TEREZA BOHACKOVA

Abstract

Air pollution in museums, libraries, churches, and other indoor environments of culture heritage objects was studied since 1980s. For classification of corrosivity of such type of indoor environments the ISO 11844 series was developed. The indoor corrosivity for basic metallic materials had been studied for Baroque library hall of Klementinum areal, Prague, using exposure of metallic coupons and measuring the climatic and pollution parameters. The Baroque library was first opened in 1722 year as a part of the Jesuit university based in Klementinum. It houses over 20,000 books, from the beginning of the 17th century until recent times. As the building is located in the centre of Prague, the outdoor environment is polluted mainly by nitrogen oxides from traffic source, but in 1990s of last century the sulphur dioxide pollution was also on high level. The Baroque hall is cladded by wooden panels which maybe a source of vapour organic acids corrosive for some metals and other materials as fresco paintings. The indoor gaseous air pollution was measured for 2 years with passive samplers – SO₂, NO_x, vapour acetic acid. The new method for acetic acid measurement was verified. Metallic coupons of zinc, coper, silver and lead were exposed in this hall for one year and their mass increases and corrosion mass losses were evaluated. For metallic coupons the colour change is one of measured parameters, too. Repeated one-year measurement data are presented and indoor corrosivity according to ISO 11844 was determined.

Keywords

indoor corrosivity, air pollution measurement, organic acid vapours, metallic coupons corrosion loss