NDLI: Sedimentary geochemical record of historical anthropogenic activities affecting Guanabara Bay (Brazil) environmental quality

Content Provider	Springer Nature Link
Author	Monteiro, Fábio F. Cordeiro, Renato C. Santelli, Ricardo E. Machado, Wilson Evangelista, Heitor Villar, Leonardo S. Viana, Luis C. A. Bidone, Edison D.
Copyright Year	2011
Abstract	A sediment core from Guanabara Bay (Brazil) was analyzed for $^{210}$Pb dating, grain size, total organic carbon (TOC) and total nitrogen, carbon stable isotope ratio (δ$^{13}$C), nitrogen stable isotope ratio (δ$^{15}$N) and the metals Fe, Mn, Ni, Co, Cu, Pb, V and Zn, to assess the influence of land use changes on the aquatic system in a region for which large industrial and urban development is expected in the next few decades. To obtain baseline data for improving the monitoring of the expected increase in anthropogenic impacts from surrounding drainage basins, a multivariate analysis of data from different sediment layers was carried out to evaluate the dated sediment record. The geochemical data suggested three different sedimentary phases along the last 200 years. Before the 1880s, the highest clay and TOC contents were observed, where the C/N ratios and the δ$^{13}$C values suggested a mixture of algal and terrestrial organic matter and the lowest concentrations of Co, Cu, Pb, V and Zn, for which background levels were estimated (4.6, 2.7, 14.9, 24.3 and 70.2 mg kg$^{−1}$, respectively). From the 1880s to the 1950s, the metal concentrations and sand particles increased, but no change in organic matter quality was observed, reflecting a period of land use change, still without significant sewage input. After the 1950s, the sedimentation rate increased from 0.42 to 0.77 cm year$^{−1}$ and increasing urban sewage input was evidenced by lower C/N ratios, higher δ$^{15}$N, decrease of Fe and Mn concentrations and increased fluxes of metals and TOC, which showed a good relationship with population growth data.
Starting Page	1661
Ending Page	1669
Page Count	9
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	65
Issue Number	6
e-ISSN	18666299
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-06-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Trace metal 210-Pb dating Contamination Land use changes Guanabara Bay Geology
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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