Behaviour and mobility of U and Ra in sediments near an abandoned uranium mine, Cornwall, UK

Saifeldin M. Siddeeg; Nicholas D. Bryan; Francis R. Livens

doi:10.1039/c4em00230j

Behaviour and mobility of U and Ra in sediments near an abandoned uranium mine, Cornwall, UK

Environmental Science Processes & Impacts ◽

10.1039/c4em00230j ◽

2015 ◽

Vol 17 (1) ◽

pp. 235-245 ◽

Cited By ~ 6

Author(s):

Saifeldin M. Siddeeg ◽

Nicholas D. Bryan ◽

Francis R. Livens

Keyword(s):

Uranium Mine ◽

Sediment Samples ◽

South West ◽

Geochemical Dispersion

Sediment samples were collected from the vicinity of the abandoned South Terras uranium mine in south-west UK and analysed for uranium and 226Ra to explore their geochemical dispersion.

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Physical-chemical characterization of uranium containing sediments

Nova Biotechnologica et Chimica ◽

10.36547/nbc.1139 ◽

2021 ◽

Vol 9 (3) ◽

Author(s):

Lucia Závodská ◽

Eva Kosorínová ◽

Juraj Lesný ◽

Dušan Bodiš

Keyword(s):

Chemical Characterization ◽

Uranium Content ◽

Stream Sediments ◽

Uranium Mine ◽

Mountain Range ◽

Sequential Fractionation ◽

Sediment Samples ◽

Physical Chemical ◽

Groundwater Outflow

The presented paper is intended to study the chemical behaviour of combined geogenicanthropogenic uranium content in specific stream sediments. The sampling points have been chosen with respect to the natural conditions in the locality of groundwater outflow from a former uranium mine adit in Považský Inovec mountain range, near Kálnica village. Besides the total uranium determination and physical-chemical characterization of the relevant water- and sediment samples we carried out modified Tessier type sequential fractionation extractions of natural- and artificially contaminated sediment samples after time dependent agitation in air and in the atmosphere of argon. The obtained results have been compared with those fulfilled with montmorillonite K-10. The total uranium concentrations of the relevant groundwater samples as well as of stream sediments have been determined by ICP-MS using HP 4500. The determinations of uranium in extracts have been accomplished according STN757614, utilizing arsenazo III as a selective complex forming reagent for spectrophotometric determination of uranyl-ions at 650 nm. The total uranium concentration of the groundwater outflow and in the sediment taken in its immediate vicinity has been 31.75±0.35 μg dm-3 and 38.0±2.7 μg g-1 respectively. Unlike montmorillonit K-10, in which the carbonate-bound fraction of uranium after 1 week aeration and agitation in argon atmosphere represents 22.8% and 18.6% respectively, uranium in investigated sediments has been present predominantly in carbonate-bound fraction-reaching under similar conditions 38.6% and 26.6%, respectively.

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Acid extraction treatment of sediment samples for organotin speciation; occurrence of butyltin and phenyltin compounds on the cadiz coast, south-west spain

Applied Organometallic Chemistry ◽

10.1002/aoc.590090109 ◽

1995 ◽

Vol 9 (1) ◽

pp. 51-64 ◽

Cited By ~ 31

Author(s):

J. L. Gomez-ariza ◽

R. Beltrán ◽

E. Morales ◽

I. Giraldez ◽

M. Ruiz-benitez

Keyword(s):

Acid Extraction ◽

Sediment Samples ◽

South West ◽

Extraction Treatment

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Livestock and Small-Scale Irrigation Scheme Interactions as a Key Source for Sedimentation during the Irrigation Season: Four Case Studies from South-West Shoa, Ethiopia

Sustainability ◽

10.3390/su13105745 ◽

2021 ◽

Vol 13 (10) ◽

pp. 5745

Author(s):

Hanan Tadele Dessalegn ◽

Alex Bolding ◽

Charlotte de Fraiture ◽

Mekonen Ayana

Keyword(s):

Suspended Sediment ◽

Overland Flow ◽

Small Scale ◽

Irrigation Season ◽

Irrigation Scheme ◽

Sediment Samples ◽

South West ◽

Canal Network ◽

Small Scale Irrigation ◽

Upstream Catchment

Small-scale irrigation (SSI) development can play a major role in Ethiopia’s economic development, but sedimentation is a major threat to its sustainability. The focus of the dominant discourse around the sedimentation of SSI schemes lies in upstream catchment protection during the rainy season, neglecting both protection against erosion through overland flow along the margins of the canal network and sedimentation caused by livestock disturbances. Remedies against the latter causes of sedimentation during the irrigation season have been ineffective due to erroneous assumptions regarding its cause. This study aimed to identify the sources and extent of sedimentation in SSI schemes. The accumulated sediment in the canal pre-irrigation season was measured from four SSI schemes and suspended sediment samples during irrigation season were collected from one SSI scheme. The accumulated sediment in the canal pre-irrigation season was measured from four SSI and suspended sediment samples during irrigation season were collected from one SSI scheme. The extent of sedimentation in the canals during the pre-irrigation season in relation to canal capacity was 100% of lined and unlined canals in abandoned, 68% in a lined, and 84% unlined canals in heavily sedimented and 38% in a lined and 46% of unlined canals lightly sedimented schemes. Livestock interactions with the SSI schemes were found to be the major sediment source before and during the irrigation, hence, attention should be given to integrating livestock as a part of the system.

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