Determination of geochemical background values on a tropical estuarine system in a densely urban area. Case study: Capibaribe estuary, Northeastern Brazil

This study aims to infer the background values of several metals in the Capibaribe estuary and to identify the likely impact of anthropic activities during 200-years of sedimentation. Two cores were sampled, with subsamples at intervals of 2cm. Sedimentation rates and metal concentrations were analy...

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Bibliographic Details
Published in:Marine pollution bulletin 2017-10, Vol.123 (1-2), p.381-386
Main Authors: Xavier, Diego de Arruda, Schettini, Carlos Augusto, França, Elvis Joacir, Figueira, Rubens César, Barcellos, Roberto Lima
Format: Article
Language:English
Subjects:
Aluminum
Anthropic activities
Arsenic - analysis
Brackishwater environment
Brazil
Capibaribe estuary
Case studies
Contamination
Copper
Cores
Environmental Monitoring - methods
Estuaries
Estuarine dynamics
Estuarine sedimentation
Geochemistry
Geologic Sediments - analysis
Geologic Sediments - chemistry
Heavy metals
Lead
Manganese
Masking
Metal concentrations
Metals
Metals, Heavy - analysis
Nickel
Sedimentation
Sedimentation & deposition
Sedimentation rates
Tropical Climate
Urban areas
Urban Renewal
Water Pollutants, Chemical - analysis
Zinc
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Summary:This study aims to infer the background values of several metals in the Capibaribe estuary and to identify the likely impact of anthropic activities during 200-years of sedimentation. Two cores were sampled, with subsamples at intervals of 2cm. Sedimentation rates and metal concentrations were analyzed. The Al-normalized method was used to infer the background values, and to identify anthropic influences, the enrichment factor, the contamination factor and the geoaccumulation index were employed. The background values showed concentrations for Mn of 292.2, for Co of 10.4, for Ni of 22.3, for Cu of 60.8, for Zn of 105.5, for As of 106.0, for Pb of 52.9 (all in mgkg−1) and for Fe of 2.7%, The higher values, mainly for As, Zn and Pb, are associated with the influence of the Barreiras Formation. The geogenic inputs are significantly greater than the anthropic activities, masking the contamination. •The background of heavy metals in Capibaribe Estuary sediments is determined.•The anthropic contamination is not a clear evidence in estuarine sediments.•Tertiary sedimentary formation may be masking the anthropic contamination in estuary.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2017.09.007