Three centuries of heavy metal pollution in Paris (France) recorded by urban speleothems.
The first record of urban speleothems used to reconstruct the history of heavy metal pollution of shallow groundwaters is presented. Two speleothems grew during the last 300 years in an underground aqueduct in the north-eastern part of Paris. They display high Pb, Mn V, Cu, Cd and Al concentrations since 1900 due to the urbanization of the site which triggered anthropogenic contamination of the water feeding the speleothems. Surprisingly, these heavy metal concentrations are also high in the oldest part. This early pollution could come from the use of Parisian waste as fertilizers in the orchards and vineyards cultivated above the aqueduct before urbanization. Lead isotopes were measured in these carbonates as well as in lead artifacts from the 17th-18th centuries ((206)Pb/(207)Pb=1.180+/-0.003). The mean (206)Pb/(207)Pb ratio, for one of the speleothems is 1.181+/-0.003 unvarying with time. These lead signatures are close to those of coal and old lead from northern European mines, lower than the natural background signature. It confirms that the high metal concentrations found come from anthropogenic pollution. Conversely, the lead isotopic composition of the second speleothem presents two temporal trends: for the oldest levels, the mean value (1.183+/-0.003) is similar to the first speleothem. For the youngest part, a lower value (1.172+/-0.005) is recorded, evidencing the contribution of a new lead source at the beginning of the industrial revolution. Pb isotopes were also measured in recent samples from a nearby superficial site. The first sample is a recent (AD 1975+/-15 years) deposit ((206)Pb/(207)Pb=1.148+/-0.003), and the second, a thin subactual layer ((206)Pb/(207)Pb=1.181+/-0.002). These data are compatible with the adding of anthropogenic sources (leaded gasoline and industrial lead from Rio Tinto ore).
LSCE (UMR8212, CEA/CNRS/UVSQ), Bâtiment 12, avenue de la Terrasse, 91198 Gif-Sur-Yvette, France. Electronic address: epons@lsce.ipsl.fr.
Edwige
E
Pons-Branchu
LSCE (UMR8212, CEA/CNRS/UVSQ), Bâtiment 12, avenue de la Terrasse, 91198 Gif-Sur-Yvette, France.
Sophie
S
Ayrault
LSCE (UMR8212, CEA/CNRS/UVSQ), Bâtiment 12, avenue de la Terrasse, 91198 Gif-Sur-Yvette, France.
Matthieu
M
Roy-Barman
LSCE (UMR8212, CEA/CNRS/UVSQ), Bâtiment 12, avenue de la Terrasse, 91198 Gif-Sur-Yvette, France.
Louise
L
Bordier
CEREMA, 12 rue Teisserenc de Bort, 78190 Trappes, France.
Wolfgang
W
Borst
CEREMA, 12 rue Teisserenc de Bort, 78190 Trappes, France.
Philippe
P
Branchu
LSCE (UMR8212, CEA/CNRS/UVSQ), Bâtiment 12, avenue de la Terrasse, 91198 Gif-Sur-Yvette, France.
Eric
E
Douville
CEREMA, rue de l'égalité Prolongée, 93352, Le Bourget cedex 319, France.
Emmanuel
E
Dumont
D004784:Environmental Monitoring / Q000379:methods*; D004787:Environmental Pollution / Q000706:statistics & numerical data*; D019015:Geologic Sediments / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis*; D008906:Mining; D010297:Paris; D014507:Urbanization
D019216:Metals, Heavy
Aqueduct; Heavy metal pollution; Lead stable isotopes; Speleothems; Urban groundwater