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  • 1
    Electronic Resource
    Electronic Resource
    210Pb and210Po analysis in sediments and soils by microwave acid digestion (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 227 (1998), S. 19-22 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A microwave acid digestion method prior to the determination of210Pb and210Po in sediments and soils is described. It involves an acid (HNO3, HCl, HF and H3BO3 mixture) digestion with microwave heating in closed vessels at high pressures. Analyses carried out for various reference materials showed that the results were statistically equal to certified values and reproducibility was also assured. The advantage of the microwave technique compared to the traditional leaching procedures is that the solid materials are completely dissolved and, therefore, ca. 100% efficiency is achieved in the extraction of210Po and210Pb, even though a fraction is associated to the silica net. Moreover, time of analysis is drastically reduced, as are the risks associated to vapour inhalation and material corrosion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386425
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Historical Variations in Lead Fluxes in the Pyrenees (Northeast Spain) from a Dated Lake Sediment Core (1998)
    Springer
    Water, air & soil pollution 105 (1998), S. 439-449 
    Details
    ISSN: 1573-2932
    Keywords: Lake Redó ; lake sediments ; lead ; metal pollution ; mining ; 210Pb-dating ; Pyrenees ; stable Pb isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Variations in Pb concentration in lake sediments reflect changes in the fluxes of this element in the past. A sediment core from a lake in the Pyrenees (Lake Redó at 2,240 m a.s.l., NE Spain) was studied, with the aim of reconstructing past environmental and climatic conditions in the lake and its catchment area. The core was dated using both 210Pb and 14C. A surface peak of Pb concentration, which was about 10 times higher than the background level, was found. This peak is attributed to mining activities since the beginning of this century. Although Pb pollution due to the combustion of gasoline is expected to be present, no evidence can be deduced from Pb isotope ratios of sediment due to the masking effect of Pb from mines. A second peak appeared in a deeper layer, with a maximum Pb concentration of about 17 times higher than the background level. The origin of this peak is unclear. All evidence suggests that the ancient peak is due to mining operations in the central Pyrenees area, which were not documented historically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005005625972
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Submarine Groundwater Discharge to the Coastal Environment of a Mediterranean Island (Majorca, Spain): Ecosystem and Biogeochemical Significance (2010)
    Springer
    In:  Ecosystems, 13 (5). pp. 629-643.
    Details
    Publication Date: 2018-03-08
    Description: This article reports the results of a study of submarine groundwater discharge (SGD) to coastal waters of Majorca (NW Mediterranean). The overall aim is to evaluate the relevance of SGD of the island and chemically characterize the components that are supplied to the coastal waters through this pathway. Although other discharge areas are identified, we particularly focus on SGD in bays and areas of increased sea water residence time where effects of the discharges are expected to be most notable. Analysis at four selected embayments with different land-use characteristics indicated a link between human activities (mainly agriculture and urban) and compounds arriving to the coast. A pathway for these elements is the diffuse discharge along the shoreline, as suggested by the inverse relationship between salinity and nutrients in nearshore porewaters. A general survey was conducted at 46 sites around the island, and used dissolved radium as a qualitative indicator of SGD. Measurements of nutrients (P and N), pCO2 and TOC were performed to characterize the elements delivered to the coastal environment. Most nearshore samples showed 224Ra enrichment (mean ± SE, 7.0 ± 0.6 dpm 100 l−1) with respect to offshore waters (1.1 ± 0.2 dpm 100 l−1); however, 224Ra measurements along the coast were highly variable (1.0–38.1 dpm 100 l−1). Coastal samples with enhanced radium levels showed elevated pCO2 with respect to atmospheric concentrations, which together with high pCO2 in groundwater (〉5,000 ppm) indicates that SGD is an important vector of CO2 to coastal waters. Moreover, a relationship between 224Ra and phytoplankton biomass was established, suggesting an important impact of SGD on coastal productivity. The results presented here provide a first approximation of the SGD effect in the coastal waters of Majorca, and indicate that SGD could be an important source of nutrients and CO2 to the coast, strongly influencing the productivity and biogeochemical cycling of the coastal waters of Majorca.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s10021-010-9334-5
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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