Important role of colloids in the cycling of 210Po and 210Pb in the ocean: Results from the East/Japan Sea

Kim, Tae-Hoon; Kim, Guebuem

doi:10.1016/j.gca.2012.07.029

Cited by 23 publications

(12 citation statements)

References 52 publications

(64 reference statements)

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“…In order to examine the behaviors of 210 Pb and 210 Po in different oceanic settings, our results are compared with previously published data in the northwestern Pacific seas. The data are sorted into three regions: the NWPO (Tsunogai and Nozaki, 1971;Nozaki and Tsunogai, 1976;Nozaki et al, 1990a), the ECS shelf water (Lee et al, 1996;Hong et al, 1999;Su et al, 2017; this study), and the East Sea (Kim and Kim, 2012; this study; Figure 1). Data on the truly dissolved and colloidal phases of 210 Pb and 210 Po are only available in this study (ECS shelf water) and in Kim and Kim (2012;East Sea).…”

Section: Resultsmentioning

confidence: 99%

“…The data are sorted into three regions: the NWPO (Tsunogai and Nozaki, 1971;Nozaki and Tsunogai, 1976;Nozaki et al, 1990a), the ECS shelf water (Lee et al, 1996;Hong et al, 1999;Su et al, 2017; this study), and the East Sea (Kim and Kim, 2012; this study; Figure 1). Data on the truly dissolved and colloidal phases of 210 Pb and 210 Po are only available in this study (ECS shelf water) and in Kim and Kim (2012;East Sea). Although the stations of Lee et al (1996) and stations E1, S1, and S4 in this study are located in the southwestern part of the East Sea, they are included in the ECS shelf water data because they are located downstream of the ECS shelf water flows (Morimoto and Yanagi, 2001;Chang et al, 2004Chang et al, , 2016.…”

Section: Resultsmentioning

confidence: 99%

“…The analytical methods for 210 Pb and 210 Po were adapted from Kim and Kim (2012). Briefly, the 209 Po spike (1 dpm), Pb 2+ carrier (20 mg), and Fe 3+ carrier (50 mg) were added to the seawater samples.…”

Section: Po Analysismentioning

confidence: 99%

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Contrasting Behaviors of 210Pb and 210Po in the Productive Shelf Water Versus the Oligotrophic Water

2021

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We measured the total, truly dissolved (<10 kDa), colloidal (10 kDa–0.2 μm), and particulate phases (>0.2 μm) of 210Pb and 210Po in the East China Sea (ECS) shelf water and the East Sea (Japan Sea). In order to examine the behaviors of 210Pb and 210Po in different marine environments, we compiled our results with previously reported data in the same region and in the northwestern Pacific Ocean (NWPO). The proportions of the truly dissolved, colloidal, and particulate phases in the shelf water were 32, 27, and 41% for 210Pb and 49, 32, and 19% for 210Po, respectively. Based on a steady-state scavenging model, 210Pb and 210Po showed higher (3.0 ± 0.6 year–1) and lower (0.3 ± 0.2 year–1) scavenging rates, respectively, in the shelf water than those in the NWPO and the East Sea. A non-steady-state model, accounting for the residence time of the shelf water, also showed twice more efficient removal rate of 210Pb in the shelf water than that in the NWPO and the East Sea. In contrast, there was the net input of 210Po in the shelf water relative to the large removal in the NWPO and the East Sea. The large proportions of total dissolved (truly dissolved + colloidal) 210Po (>80%) in the shelf water indicate active regeneration of 210Po from the sinking particles and the surface sediments. Our results suggest that the ECS shelf is the source for Po in the northwestern Pacific marginal seas, a proxy for sulfur group elements (S, Se, and Te), whereas it is the efficient sink for Pb, together with other particle-reactive trace elements.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Contrasting Behaviors of 210Pb and 210Po in the Productive Shelf Water Versus the Oligotrophic Water

2021

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“…Small, but still significant fractions of the total 210 Pb (14.3%) and 210 Po (21.0%) were extracted with NH 2 OH·HCl in 25% v/v acetic acid, which may indicate partial association of the radionuclides with Fe-Mn-oxides [186]. The bio-reactivity of 210 Pb and 210 Po was demonstrated by Kim and Kim [187], who asserted that colloids play a major role in their cycling within oceans.…”

Section: Clay Minerals Iron-manganese-oxides and Organicsmentioning

confidence: 98%

210Pb and 210Po in Geological and Related Anthropogenic Materials: Implications for Their Mineralogical Distribution in Base Metal Ores

et al. 2018

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Abstract:The distributions of 210 Pb and 210 Po, short half-life products of 238 U decay, in geological and related anthropogenic materials are reviewed, with emphasis on their geochemical behaviours and likely mineral hosts. Concentrations of natural 210 Pb and 210 Po in igneous and related hydrothermal environments are governed by release from crustal reservoirs. 210 Po may undergo volatilisation, inducing disequilibrium in magmatic systems. In sedimentary environments (marine, lacustrine, deltaic and fluvial), as in soils, concentrations of 210 Pb and 210 Po are commonly derived from a combination of natural and anthropogenic sources. Enhanced concentrations of both radionuclides are reported in media from a variety of industrial operations, including uranium mill tailings, waste from phosphoric acid production, oil and gas exploitation and energy production from coals, as well as in residues from the mining and smelting of uranium-bearing copper ores. Although the mineral hosts of the two radionuclides in most solid media are readily defined as those containing parent 238 U and 226 Ra, their distributions in some hydrothermal U-bearing ores and the products of processing those ores are much less well constrained. Much of the present understanding of these radionuclides is based on indirect data rather than direct observation and potential hosts are likely to be diverse, with deportments depending on the local geochemical environment. Some predictions can nevertheless be made based on the geochemical properties of 210 Pb and 210 Po and those of the intermediate products of 238 U decay, including isotopes of Ra and Rn. Alongside all U-bearing minerals, the potential hosts of 210 Pb and 210 Po may include Pb-bearing chalcogenides such as galena, as well as a range of sulphates, carbonates, and Fe-oxides. 210 Pb and 210 Po are also likely to occur as nanoparticles adsorbed onto the surface of other minerals, such as clays, Fe-(hydr)oxides and possibly also carbonates. In rocks, unsupported 210 Pb-and/or 210 Po-bearing nanoparticles may also be present within micro-fractures in minerals and at the interfaces of mineral grains. Despite forming under very limited and special conditions, the local-scale isotopic disequilibrium they infer is highly relevant for understanding their distributions in mineralized rocks and processing products.

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“…Yang et al (2003) found that colloidal 210 Po ranged from 23% to 42% in estuarine waters. Kim and Kim (2012) determined the colloidal residence time using 210 Po- 210 Pb pair in the Japan Sea. Together, these studies seemed to support their colloidal associations.…”

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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Important role of colloids in the cycling of 210Po and 210Pb in the ocean: Results from the East/Japan Sea

Cited by 23 publications

References 52 publications

Contrasting Behaviors of 210Pb and 210Po in the Productive Shelf Water Versus the Oligotrophic Water

Contrasting Behaviors of 210Pb and 210Po in the Productive Shelf Water Versus the Oligotrophic Water

210Pb and 210Po in Geological and Related Anthropogenic Materials: Implications for Their Mineralogical Distribution in Base Metal Ores

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

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