title: Carbon air pollution reflected in deposits on chosen building materials of Prague Castle.
abstract: Thin black surface layers or black coloured gypsum crusts can be observed on stones of many buildings and sculptures around the world. The black weathered stone and mortar surface from selected sections of the Prague Castle were studied by microscopic methods, GC/MS and pyrolysis-GC/MS analysis. Microscopically, we found an authigenic gypsum formation with an outer layer of an admixture of fine grains of quartz, clay minerals, thermally altered clay minerals, fly ash, and carbonaceous particles of natural and anthropogenic origin particularly chars, cokes, soots. Noncarbonate C content ranged between 0.8% and 4.3%. Phtalates dominated in extracts from the samples and benzonitrile had the greatest abundance in the pyrolysis products. The identified organic particles and compounds are known to result from human activities.
authors.affiliation: Institute of Rock Structure and Mechanics AS CR,v.v.i., VHolešovičkách 41182 09 Prague, Czech Republic. ykorova@irsm.cas.cz
authors.forename: Ivana
authors.initials: I
authors.lastname: Sýkorová
authors.forename: Martina
authors.initials: M
authors.lastname: Havelcová
authors.forename: Antonín
authors.initials: A
authors.lastname: Zeman
authors.forename: Hana
authors.initials: H
authors.lastname: Trejtnarová
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002133:Calcium Sulfate / Q000032:analysis; D002244:Carbon / Q000032:analysis*; D002947:Cities; D003252:Construction Materials; D018153:Czech Republic; D004784:Environmental Monitoring / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry; D008859:Microscopy, Polarization; D009570:Nitriles / Q000032:analysis; D010795:Phthalic Acids / Q000032:analysis; D053260:Soot / Q000032:analysis
chemical_list: D000393:Air Pollutants; D009570:Nitriles; D010795:Phthalic Acids; D053260:Soot; D002244:Carbon; C014356:benzonitrile; D002133:Calcium Sulfate