Application of 234U/238U activity ratios to investigations of subterranean groundwater discharge in the Cádiz coastal area (SW Spain)

J. F. Rodrigo, M. Casas- Ruiz, J. Vidal, L. Barbero, M. Baskaran, Michael E Ketterer

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The activity ratios of 234U/238U were used to investigate processes of subterranean groundwater discharge into coastal marine waters in a study location at Bay of Cádiz (southwest Spain). Marine waters in the bay and surrounding open ocean exhibited U concentrations of 3.4±0.1μg/L and activity ratios of 1.15±0.01, in agreement with the expected composition of seawater (234U/238U activity ratio=1.148±0.002). Three water samples obtained from the discharge zone of the Guadalete River exhibited activity ratios of 1.17-1.22 along with slightly lower U concentrations compared to seawater, which is likely due to mixing between seawater and a groundwater end-member. One possible source of groundwater was characterized by sampling and analyzing a well water sample collected in the neighboring village of El Puerto de Santa María; this water sample exhibited an activity ratio of 1.34±0.03 and a U concentration of 1.22μg/L. Water from the Guadelete River estuarine zone can be explained to result from a two-component mixture of seawater and groundwater from the El Puerto de Santa María well; however, if there are several groundwater reservoirs with different U activity ratios that discharge to the coastal water, then, it may be difficult and more studies are being conducted to address this issue.

Original languageEnglish (US)
Pages (from-to)68-71
Number of pages4
JournalJournal of Environmental Radioactivity
Volume130
DOIs
StatePublished - Apr 2014

Fingerprint

Groundwater
Spain
Seawater
groundwater
Water
seawater
water
Rivers
well water
open ocean
river
coastal water
village
coastal area
Oceans and Seas
Discharge (fluid mechanics)
sampling
Sampling
Chemical analysis

Keywords

  • U/U activity ratios
  • Coastal aquifers
  • ICP-MS
  • Submarine groundwater discharge (SGD)

ASJC Scopus subject areas

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis
  • Waste Management and Disposal
  • Pollution

Cite this

Application of 234U/238U activity ratios to investigations of subterranean groundwater discharge in the Cádiz coastal area (SW Spain). / Rodrigo, J. F.; Casas- Ruiz, M.; Vidal, J.; Barbero, L.; Baskaran, M.; Ketterer, Michael E.

In: Journal of Environmental Radioactivity, Vol. 130, 04.2014, p. 68-71.

Research output: Contribution to journalArticle

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