The 7Be/210Pbxs ratio as an indicator of suspended sediment age or fraction new sediment in suspension

Matisoff, Gerald; Wilson, Christopher G.; Whiting, Peter J.

doi:10.1002/esp.1270

Cited by 100 publications

(135 citation statements)

References 44 publications

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“…The slope of the linear trend line, which was approximately 14.5, was similar to other studies (Baskaran et al 1993;Matisoff et al 2005) that observed values around 16.…”

Section: Resultssupporting

confidence: 90%

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Fine sediment sources in Conservation Effects Assessment Project watersheds

Wilson¹,

Kuhnle²,

Dabney³

et al. 2014

Journal of Soil and Water Conservation

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“…The slope of the linear trend line, which was approximately 14.5, was similar to other studies (Baskaran et al 1993;Matisoff et al 2005) that observed values around 16.…”

Section: Resultssupporting

confidence: 90%

“…The theory behind the method is detailed by Matisoff et al (2005), Whiting et al (2005), and Wilson et al (2008a). The method utilized the activities of two naturally occurring radioisotopes, Beryllium-7 ( 7 Be) and Pb xs ) , as tracers and a simple two end-member mixing model.…”

mentioning

confidence: 99%

Fine sediment sources in Conservation Effects Assessment Project watersheds

Wilson¹,

Kuhnle²,

Dabney³

et al. 2014

Journal of Soil and Water Conservation

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“…The strong correlation of 131 I and 7 Be in channel margin deposits along the entire length of Mink Brook suggests uniform inheritance and residence time of 131 I in this depositional environment. In this circumstance, the differential decay rates of 131 I and 7 Be can be exploited to constrain the age of the iodinebearing sediment (32). Here we assume an initial 131 I-7 Be composition equivalent to that of topsoil from our headwater floodplain site, where the soil was found to be saturated, overland flow appeared active, and lateral connectivity of the surrounding hill slope with the stream channel appeared in this manner to be qualitatively high.…”

Section: Resultsmentioning

confidence: 99%

Surficial redistribution of fallout¹³¹iodine in a small temperate catchment

Landis

Hamm²,

Renshaw³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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Isotopes of iodine play significant environmental roles, including a limiting micronutrient ( 127 I), an acute radiotoxin ( 131 I), and a geochemical tracer ( 129 I). But the cycling of iodine through terrestrial ecosystems is poorly understood, due to its complex environmental chemistry and low natural abundance. To better understand iodine transport and fate in a terrestrial ecosystem, we traced fallout 131 iodine throughout a small temperate catchment following contamination by the 11 March 2011 failure of the Fukushima Daiichi nuclear power facility. We find that radioiodine fallout is actively and efficiently scavenged by the soil system, where it is continuously focused to surface soils over a period of weeks following deposition. Mobilization of historic (pre-Fukushima) 137 cesium observed concurrently in these soils suggests that the focusing of iodine to surface soils may be biologically mediated. Atmospherically deposited iodine is subsequently redistributed from the soil system via fluvial processes in a manner analogous to that of the particle-reactive tracer 7 beryllium, a consequence of the radionuclides’ shared sorption affinity for fine, particulate organic matter. These processes of surficial redistribution create iodine hotspots in the terrestrial environment where fine, particulate organic matter accumulates, and in this manner regulate the delivery of iodine nutrients and toxins alike from small catchments to larger river systems, lakes and estuaries.

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“…Regardless of particle types, the role of organic matter and its interactions with particle surfaces cannot be ignored (Li, 2005;Lin et al, 2015). To eliminate the particle composition influence on Be scavenging, different tracer pairs such as 7 Be-210 Pb and 7 Be-234 Th instead of Be alone have been used in some studies (e.g., Baskaran et al, 1997;Feng et al, 1999b;Matisoff et al, 2005;Masqué et al, 2007). Nevertheless, particle composition could have a significant influence on the isotopic fractionation between 7 Be and 210 Pb (e.g., Yang et al, 2013), thus complicating the use of these tracer pairs.…”

Section: Introductionmentioning

confidence: 99%

Influence of organic matter on the adsorption of 210Pb, 210Po and 7Be and their fractionation on nanoparticles in seawater

Yang

Guo

Chuang

et al. 2015

Earth and Planetary Science Letters

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Editor: J. Lynch-StieglitzKeywords: radionuclide scavenging natural organic matter nanoparticles polonium lead beryllium Improved applications of 210 Po, 210 Pb and 7 Be as geochemical proxies require more detailed understanding of their interactions with particles. Here, laboratory sorption experiments were carried out to examine the adsorption of 210 Po, 210 Pb and 7 Be and their fractionation on inorganic nanoparticles, including SiO , in the presence or absence of macromolecular organic compounds (MOCs) that include humic acids (HA), acid polysaccharides (APS) and proteins (BSA), in natural seawater. Results showed that nanoparticle sorption was not greatly enhanced over that of microparticles as would be expected from their much higher specific surface areas, likely indicating their aggregation in seawater. It was found that synergistic interactions between inorganic nanoparticles, MOCs, and radionuclides determined the sorption, although their adsorption was particle composition-dependent. MOCs enhanced the sorption of selected nuclides on most nanoparticles. On average, in the presence of MOCs, partition coefficients (K c ) of 210 Po, 210 Pb, and 7 Be on nanoparticles increased 2.9-, 5.0-and 5.9-fold, respectively. The effect of MOCs could be explained for 210 Po and 210 Pb from their different log K c values on inorganic nanoparticles. In addition, fractionation effects between 210 Po and 210 Pb (or between 210 Pb and 7 Be) could be quantified from their relative log K c values on end-member sorbent components. Applications of both 210 Po-210 Pb and 7 Be-210 Pb pairs as particle dynamics tracers could be more quantitative when the nature of the organic coatings is taken into account.

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The ⁷Be/²¹⁰Pb_xs ratio as an indicator of suspended sediment age or fraction new sediment in suspension

Cited by 100 publications

References 44 publications

Fine sediment sources in Conservation Effects Assessment Project watersheds

Fine sediment sources in Conservation Effects Assessment Project watersheds

Surficial redistribution of fallout¹³¹iodine in a small temperate catchment

Influence of organic matter on the adsorption of 210Pb, 210Po and 7Be and their fractionation on nanoparticles in seawater

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The 7Be/210Pbxs ratio as an indicator of suspended sediment age or fraction new sediment in suspension

Cited by 100 publications

References 44 publications

Fine sediment sources in Conservation Effects Assessment Project watersheds

Fine sediment sources in Conservation Effects Assessment Project watersheds

Surficial redistribution of fallout131iodine in a small temperate catchment

Influence of organic matter on the adsorption of 210Pb, 210Po and 7Be and their fractionation on nanoparticles in seawater

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The ⁷Be/²¹⁰Pb_xs ratio as an indicator of suspended sediment age or fraction new sediment in suspension

Surficial redistribution of fallout¹³¹iodine in a small temperate catchment