Tidal variations in dissolved and particulate phase radionuclide activities in the Esk estuary, England, and their distribution coefficients and particulate activity fractions

Assinder, David; Kelly, Mike; Aston, S.R.

doi:10.1016/0265-931x(85)90022-0

Cited by 32 publications

(15 citation statements)

References 12 publications

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“…Estuarine bathymetry and hinterland elevation (metres above Ordnance Datum) derived from Lidar Imagery. Stations in which salinity has previously been measured (Assinder et al ., ; Daneshvar, ) are labelled (A) to (F). Tidal limits are marked, after Kelly et al .…”

Section: Study Area: Ravenglass Estuarymentioning

confidence: 99%

Estuarine clay mineral distribution: Modern analogue for ancient sandstone reservoir quality prediction

et al. 2019

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The spatial distribution of clay minerals in sandstones, which may both enhance or degrade reservoir quality, is poorly understood. To address this, clay mineral distribution patterns and host‐sediment properties (grain size, sorting, clay fraction abundance and bioturbation intensity) have, for the first time, been determined and mapped at an unprecedentedly high‐resolution in a modern estuarine setting (Ravenglass Estuary, UK). Results show that the estuary sediment is dominated by illite with subordinate chlorite and kaolinite, although the rivers supply sediment with less illite and significantly more chlorite than found in the estuary. Fluvial‐supplied sediment has been locally diluted by sediment derived from glaciogenic drift deposits on the margins of the estuary. Detailed clay mineral maps and statistical analyses reveal that the estuary has a heterogeneous distribution of illite, chlorite and kaolinite. Chlorite is relatively most abundant on the northern foreshore and backshore and is concentrated in coarse‐grained inner estuary dunes and tidal bars. Illite is relatively most abundant (as well as being most crystalline and most Fe–Mg‐rich) in fine‐grained inner estuary and central basin mud and mixed flats. Kaolinite has the highest abundance in fluvial sediment and is relatively homogenous in tidally‐influenced environments. Clay mineral distribution patterns in the Ravenglass Estuary have been strongly influenced by sediment supply (residence time) and subsequently modified by hydrodynamic processes. There is no relationship between macro‐faunal bioturbation intensity and the abundance of chlorite, illite or kaolinite. Based on this modern‐analogue study, outer estuarine sediments are likely to be heavily quartz cemented in deeply‐buried (burial temperatures exceeding 80 to 100°C) sandstone reservoirs due to a paucity of clay grade material (<0·5%) to form complete grain coats. In contrast, chlorite‐enriched tidal bars and dunes in the inner estuary, with their well‐developed detrital clay coats, are likely to have quartz cement inhibiting authigenic clay coats in deeply‐buried sandstones.

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Section: Study Area: Ravenglass Estuarymentioning

confidence: 99%

Estuarine clay mineral distribution: Modern analogue for ancient sandstone reservoir quality prediction

et al. 2019

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“…1981 (or 1979), whilst in the particulate fraction it is 0.27, characteristic of 1978 or earlier discharges (15). The 'older' ratio in the particulate fraction is considered to be due to the admixture of reworked older estuarine sediment with the original particulate input (4). However at salinities <8%.…”

Section: Resultsmentioning

confidence: 99%

“…A detailed description of the sampling and analytical methods are given elsewhere (4). Briefly, samples were collected by boats at mid-channel positions on 4 surveys over a 10 day period.…”

Section: Methodsmentioning

confidence: 99%

“…Initial partition of the nuclides between "dissolved" and "particulate" phases is assumed to occur soon after discharge (2), with the individual radionuclides showing different affinities for the two phases, as described by their mass distribution coefficients, K¿(mass) (ratio of unit mass particulate activity to unit mass dissolved activity). Of the elements considered here, the order of decreasing particle reactivity, and of KJ, is Pu >Ru » Cs (3,4). The two phases are differentially transported with the Irish Sea and beyond.…”

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confidence: 99%

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Conservative and non‐conservative behaviour of radionuclides in an estuarine environment, with particular respect to the behaviour of plutonium isotopes.

Assinder

Kelly

Aston

1984

Environmental Technology Letters

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Of the radionuclides entering the Esk Estuary from the Sellafield effluent discharges into the Irish Sea, the behaviour in the dissolved phase of 106 Ru, 134 Cs and 137 Cs is conservative whilst that of 238 Pu and 239,240 Pu is non-conservative. The latter leads to the enrichment of Pu in low salinity waters, probably by transfer from the particulate phase. This has repercussions on the distribution of Pu activity in the estuary, and also on the long term fate of sediment stored Pu.

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“…There are many reports providing a range of K d s derived from field observations and laboratory experiments for each element. 11,[19][20][21][22][23][24][25] Assinder et al 26) reported a wide range of K d s based on in situ measurements at different tidal states in the Esk estuary. The variation of K d s for each element can occur as a result of a number of factors in estuarine water (e.g., riverine and benthic element input and complexation of an element with dissolved organic matter or resuspended particulate matter) 1,25) or sediments (e.g., interaction with organic matter and/or Fe hydroxides).…”

Section: K D S In the Estuarine Areas Of Japanmentioning

confidence: 99%

Sediment-Water Distribution Coefficients of Stable Elements in Four Estuarine Areas in Japan

Takata¹,

Aono²,

Tagami³

et al. 2010

Journal of Nuclear Science and Technology

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Sediment-water distribution coefficients (K d s) were obtained in estuarine areas of four A-class rivers in Japan. The total concentrations of stable elements and naturally occurring radionuclide (i.e., Na, Mg, K, Ca, V, Mn, Fe, Co, Ni, Cu, Rb, Sr, Y, Mo, Cd, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pb, and U) in the estuarine water at each sampling point and in the corresponding sediment sample were measured. K d s of most of the elements varied within one order of magnitude regarding their differences between minimum and maximum values of each element at all the stations. However, a wide variation of K d s of Mn, Fe, Co, Cu, Rb, and La was observed. In addition, geometric means (GMs) of observed K d s were compared with the recommended values in the IAEA Technical Report Series 422 (TRS-422). The results showed that GMs of K d s for most of the elements agreed well with the recommended values, but GMs of K d s for Mn, Fe, and Cd were more than 10 times lower than the recommended values. The obtained K d values could be important to investigate the behavior, transport, and fate of artificial radionuclide and to assess the radiological doses in estuarine areas.

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Tidal variations in dissolved and particulate phase radionuclide activities in the Esk estuary, England, and their distribution coefficients and particulate activity fractions

Cited by 32 publications

References 12 publications

Estuarine clay mineral distribution: Modern analogue for ancient sandstone reservoir quality prediction

Estuarine clay mineral distribution: Modern analogue for ancient sandstone reservoir quality prediction

Conservative and non‐conservative behaviour of radionuclides in an estuarine environment, with particular respect to the behaviour of plutonium isotopes.

Sediment-Water Distribution Coefficients of Stable Elements in Four Estuarine Areas in Japan

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