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Chemical Composition of Rainwater Near Two Historical Monuments The Thann Collegiate (Alsace,France) and the Tours Cathedral (Indre et Loire,France) |
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| Authors: | Millet Maurice Wortham Henri Mirabel Philippe Flori Jean-Paul Lakkis Dominique Leroy Maurice |
| Institution: | 1. Département de Chimie de l'Université Louis Pasteur, Equipe de Physico-chimie de l'Atmosphère du Centre de Géochimie de la Surface (UMR 7517) et, 1 rue Blessig, 67084, Strasbourg Cedex, France 2. Centre Scientifique et Technique du Batiment, Aérodynamique et Environnement Climatique –, 11, rue Henri Picherit, 44323, Nantes Cedex 03, France 3. Laboratoire de Chimie Minérale et Analytique de l'Ecole de Chimie, Polymères et Matériaux –, 1, rue Becquerel, 67000, Strasbourg-Cronenbourg, France |
| Abstract: | In the present study, included within the framework of a Franco-German Research Program for Conservation of HistoricalMonuments, the chemical composition of rainwater was investigated in Thann (Alsace, France) and in Tours (Indre etLoire, France) between 1992 and 1993. A total of 78 and 24samples, respectively, were collected, near the Thann collegiateand the Tours cathedral on a weekly basis and analysed for Cl-, NO3 -, SO4 2-, Na+, NH4 +, K+, Mg2+ and Ca2+. Results showpH ranged from 3.60 to 6.58 and from 5.49 to 7.01 for Thann andTours, respectively. In Thann, SO4 2- is the major anion and rainwater acidity is neutralised by compounds ofterrigenic origin which come from the soil of the upper Rhinevalley (Ca2+; ‘loess’) and the potash mines of Alsace. In Tours, SO4 2- is also the major anion and the acidity is neutralised partially by atmospheric ammonia and partially by compounds of terrigenic origin and by dust fromthe erosion of the cathedral and the works of restoration, in the form of CaCO3. |
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