Pollutant concentrations in a sediment core dated by Th-isotopic ratios and the 210Pb dating method

In this research we have dated a sediment core in an estuarine system (southwest of Spain) strongly contaminated by anthropogenic activities, making use of the enhanced levels of some natural radionuclides from uranium series found in the upper layers of the core due to these activities and applying the

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Accumulation Rates Using the 210Pb Dating Method in a Sediment Core of the Cispatá Bay, a Marine Protected Area in the Southwestern Colombian Caribbean

10.31038/gems.2021322 ◽

2021 ◽

Vol 3 (2) ◽

Keyword(s):

Sediment Core ◽

Protected Area ◽

Marine Protected Area ◽

210Pb Dating ◽

Accumulation Rates ◽

Dating Method ◽

210Pb Dating Method

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The determination of sedimentation rates in Lake Ontario using the 210Pb dating method

Canadian Journal of Earth Sciences ◽

10.1139/e78-047 ◽

1978 ◽

Vol 15 (3) ◽

pp. 431-437 ◽

Cited By ~ 33

Author(s):

John G. Farmer

Keyword(s):

Sedimentation Rate ◽

Lake Ontario ◽

Sedimentary Basins ◽

210Pb Dating ◽

Sedimentation Rates ◽

Surface Mixing ◽

Dating Method ◽

210Pb Dating Method

The 210Pb dating method has been applied successfully to the determination of recent sedimentation rates at four sites distributed among the three major sedimentary basins (Niagara, Mississauga and Rochester) of Lake Ontario. Following correction for effects due to compaction of the sediments, mean sedimentation rates ranging from 0.02 cm/year at the periphery of the Mississauga basin to 0.11 cm/year in the Niagara and Rochester basins were determined. Allowance for compaction reduced the non-compaction-corrected sedimentation rates by 20–35%. Neither 210Pb nor fallout 137Cs profiles indicated surface mixing of sediment sufficient to noticeably affect the calculated sedimentation rates. At all four sites, the sedimentation rate seems to have remained constant during the last 100–150 years.

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Lead Isotopes Combined with Geochemical Baseline in Sediments: A Novel Tool to Trace Anthropogenic Pb Sources

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17031112 ◽

2020 ◽

Vol 17 (3) ◽

pp. 1112

Author(s):

Xu ◽

Gao

Keyword(s):

Sediment Core ◽

Source Identification ◽

Anthropogenic Activities ◽

Lead Isotopes ◽

Isotopic Ratios ◽

Coal Consumption ◽

Sediment Samples ◽

Geochemical Baseline ◽

Novel Approach ◽

Pb Concentration

Traditional Pb isotopic identification only based on total Pb concentration and Pb isotopic ratios, resulted in difficulty for tracing Pb sources in the complex environmental medium, especially for sediment. Herein, a novel approach combining with regional geochemical baseline (RGB) and Pb isotopic ratios are used to directly trace anthropogenic Pb sources and calculate Pb source appointments in sediment. In this study, total Pb concentrations and isotopic ratios were analyzed for a 7-m long sediment core (92 sediment samples) collected from a reservoir. RGB of Pb was used to calculate anthropogenic Pb concentrations (Rd), their contributions (CRd) and screen the sediments influenced by anthropogenic activities. Among those sediments influenced by anthropogenic activities, a positive correlation was found between 206Pb/207Pb ratios and Rd, indicating there were two anthropogenic Pb sources in sediment. Further source identification using 206Pb/207Pb and 208Pb/207Pb indicated that these two anthropogenic Pb sources originated from coal consumption and aerosol input. Finally, CRd and Pb isotopic ratios were used to calculate these two Pb source appointments (1.13% for coal consumption and 7.53% for aerosol input). This study demonstrated that source identification using RGB and Pb isotopes could be a novel attempt for identifying anthropogenic Pb sources in sediment.

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