210Pb-derived chronology and the fluxes of 210Pb and 137Cs isotopes into continental shelf sediments, East Chukchi Sea, Alaskan Arctic

Baskaran, M.; Naidu, A. Sathy

doi:10.1016/0016-7037(95)00248-x

Cited by 180 publications

(81 citation statements)

References 44 publications

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“…None of the pro®les exhibited a typical exponential decay and, in most cases, subsur®cial 210 Pb levels were higher than those obtained in sur®cial layers. The levels of activities of 210 Pb found in the cores are comparable to those reported in other studies of coastal areas such as Long Island Sound (Benninger and others 1979); the western Mediterranean (Yokohama and others 1985); the tropical Amazon (Kuehl and others 1982;Dukat and Kuehl 1995); the eastern Chuckchi Sea (Baskaran and Naidu 1995); the Gulf of Thailand (Srisuksawad and others 1997) and San Francisco Bay estuary (Fuller and others 1999). These low activities have been explained as a result of different factors acting together, depending on each particular case, i.e., low atmospheric 210 Pb¯uxes, low production of 210 Pb from decay of parent 226 Ra dissolved in shallow waters, or the physical and biological features of the environment.…”

Section: Distribution Of Radionuclidessupporting

confidence: 81%

“…The samples for chemical analysis were freeze-dried to constant weight, ground to a powder with an agate mortar and stored in plastic bottles. Dry sediment density and water content data were used to calculate the in-situ bulk dry sediment densities and porosities to determine the uncompacted depth for each core section (Berner 1971;Baskaran and Naidu 1995).…”

Section: Methodsmentioning

confidence: 99%

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Isotopic constraints (210Pb, 228Th) on the sedimentary dynamics of contaminated sediments from a subtropical coastal lagoon (NW Mexico)

Ruíz-Fernández¹,

Hillaire‐Marcel²,

Ghaleb³

et al. 2001

Env Geol

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Six sediment push-cores were collected at a coastal lagoon system affected by urban and agriculture wastes. The sediments were analyzed for 228 Th, 230 Th, 232 Th, 210 Pb, 226 Ra, and 137 Cs. 137 Cs activities were at background level for all samples. The 210 Pb tot activities found in the area varied from 0.5 to 4.5 dpm g ±1 with 210 Pb sup levels ranging between 1.2±1.8 dpm g ±1 . Cores CHI and EPC showed¯at pro®les depleted of 210 Pb xs , indicating the absence of recent sedimentation. Core CAI shows a¯at 210 Pb xs pro®le that seems to be bioturbated. Cores ERC and BRI show chaotic pro®les with layers totally depleted in 210 Pb xs , likely caused by resuspension triggered by storm conditions. High 228 Th/ 232 Th values observed at core ERC suggest that the resuspension event occurred less than 10 years ago. The contaminated sediment of the lagoon are frequently resuspended, re-oxygenated, and therefore the contaminating trace metals will continue to be easily remobilized in the food chain.

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Section: Distribution Of Radionuclidessupporting

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Isotopic constraints (210Pb, 228Th) on the sedimentary dynamics of contaminated sediments from a subtropical coastal lagoon (NW Mexico)

Ruíz-Fernández¹,

Hillaire‐Marcel²,

Ghaleb³

et al. 2001

Env Geol

View full text Add to dashboard Cite

show abstract

“…2). This behaviour was alreao] reported in estuarine system [6]. Such correlations between silt fractions and radionuclide activities are be expected because these fine particles with their high surface area are the main carriers oi tn radionuclides.…”

Section: Resultssupporting

confidence: 77%

Radionuclide distribution in tidal flat sediments of the Westerschelde estuary

Schmidt¹,

Herman²,

Reyss³

2002

Radioprotection

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Abstract. Depth profiles of the particle-reactive radionuclides JI0 Pb, n7 Cs and 7 Be were established in sediments of a tidal flat in the Westerschelde. Cores were collected at different seasons at selected sites with contrasting characteristics. Accumulation rates estimated from 137 Cs profiles are consistent between the five sites with values comprised between 1.1 at the marginal sites and 2.5 cm y' 1 for the central part. Although the very low level of excess 210 Pb limits the precision of this method, profiles of 210 Pb" with depth allow calculating a range of sedimentation rates equivalent to those derived from 137 Cs data. At the muddy site, the vertical distribution of radionuclides revealed the existence of an important accumulation layer of fine particles at a depth of around 10 cm at the muddy site, may be in relation with biological and physical processes. The vertical distribution of 7 Be in the top 6 cm exhibits wide variability on seasonal scale, with the highest inventories and bioturbation rates observed in summer. This trend is clearly related to the seasonal variation of silt content of surface sediments.

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“…Porosity was calculated with the method outlined in Baskaran and Naidu. 22 To validate the 210 Pb sediment dating method, different analyses were performed according to specific anthropogenic occurrences in areas examined. Granulometric measurements (through wet sieving) and organic material (LOI), the difference between weight before combustion and after combustion at 450 o C for 24 h, were measured in all sediment cores.…”

Section: Methodsmentioning

confidence: 99%

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

Patchineelam¹,

Sanders²,

Smoak³

et al. 2011

J. Braz. Chem. Soc.

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210Pb-derived chronology and the fluxes of 210Pb and 137Cs isotopes into continental shelf sediments, East Chukchi Sea, Alaskan Arctic

Cited by 180 publications

References 44 publications

Isotopic constraints (210Pb, 228Th) on the sedimentary dynamics of contaminated sediments from a subtropical coastal lagoon (NW Mexico)

Isotopic constraints (210Pb, 228Th) on the sedimentary dynamics of contaminated sediments from a subtropical coastal lagoon (NW Mexico)

Radionuclide distribution in tidal flat sediments of the Westerschelde estuary

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

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