Sonja Lojen | Jožef Stefan Institute (original) (raw)

Papers by Sonja Lojen

Research paper thumbnail of Applications of stable oxygen and hydrogen isotopes in hydrological research: Slovenian experience

Research paper thumbnail of Benthic organisms as ecological indicators for the status assessment of coastal ecosystems

Journal of the Marine Biological Association of the United Kingdom, Aug 24, 2017

The presence of potentially toxic elements (PTE) was determined in different tissues of five sele... more The presence of potentially toxic elements (PTE) was determined in different tissues of five selected marine organisms. The As, Cd, Cu, Mn, Mo, Ni, Pb and Zn concentrations were measured in the seagrassCymodocea nodosa, the green algaCladophora echinus, the red algaGelidiella lubrica, the marine topshellPhorcus turbinatusand the littoral crabCarcinus aestuarii, as well as in seawater from Makirina Bay. The levels of As, Cd, Cu, Mn and Zn in the biota were found to exceed those in previously analysed sediments, indicating the bioaccumulation of these PTE. The biota-sediment accumulation factor (BSAF) and concentration factor (CF) varied among different organisms. As regards the five selected species,C. nodosa,C. echinusandG. lubricaproved to be the strongest accumulators of Mn, whileP. turbinatusandC. aestuariishowed a high capacity to accumulate As, Cd, Cu and Zn. These species can be considered as good ecological indicators in the assessment of PTE pollution in marine littoral environments.

Research paper thumbnail of Isotope composition of precipitation along the Adriatic Coasts of Croatia and Slovenia

Monitoring of isotope composition of precipitation includes measurements of radioactive isotope t... more Monitoring of isotope composition of precipitation includes measurements of radioactive isotope tritium (3H) and stable isotopes (2H, 18O) in monthly precipitation samples. Isotope composition of precipitation at Zagreb (Croatia) and Ljubljana (Slovenia) have been performed for more than 20 years within the Global Network for Isotopes in Precipitation (GNIP). Within the IAEA CRP "Isotopic composition of precipitation in the Mediterranean Basin in relation to air circulation patterns and climate" the network has been extended since September 2000 to several stations along the Adriatic coast. Here we present tritium activity and stable isotope content in monthly precipitation samples at the mentioned stations, together with the corresponding meteorological data: precipitation amount and mean monthly temperature.

Research paper thumbnail of Isotope composition of precipitation along the Adriatic Coasts of Croatia and Slovenia

Monitoring of isotope composition of precipitation includes measurements of radioactive isotope t... more Monitoring of isotope composition of precipitation includes measurements of radioactive isotope tritium (3H) and stable isotopes (2H, 18O) in monthly precipitation samples. Isotope composition of precipitation at Zagreb (Croatia) and Ljubljana (Slovenia) have been performed for more than 20 years within the Global Network for Isotopes in Precipitation (GNIP). Within the IAEA CRP "Isotopic composition of precipitation in the Mediterranean Basin in relation to air circulation patterns and climate" the network has been extended since September 2000 to several stations along the Adriatic coast. Here we present tritium activity and stable isotope content in monthly precipitation samples at the mentioned stations, together with the corresponding meteorological data: precipitation amount and mean monthly temperature.

Research paper thumbnail of Geochemical Characteristics and Distribution of Rare Earth Elements in Makirina Bay Sediments (N. Dalmatia, Republic of Croatia)

Geologica Macedonica, Dec 29, 2014

Research paper thumbnail of Origin and production method traceability of vegetables with stable isotopes - from science to practice

Research paper thumbnail of Stable isotope analysis of major bioelements, multi-element profiling, and discriminant analysis for geographical origins of organically grown potato

Journal of Food Composition and Analysis, Aug 1, 2018

Research paper thumbnail of Determination of geographical origin of commercial tomato through analysis of stable isotopes, elemental composition and chemical markers

Food Control, Jul 1, 2018

Research paper thumbnail of Application of stable isotope analyses as support for determination of hydrological response of nonhomogeneous catchment of the Ljubljanica River

Research paper thumbnail of IMTA VS. TRADITIONAL MUSSEL CULTURE IN THE MEDITERRANEAN (PRELIMINARY RESULTS OF THE PROJECT INOVaDA)

Research paper thumbnail of 15N and 13C Enrichment in Balanus perforatus: Tracers of Municipal Particulate Waste in the Murter Sea (Central Adriatic, Croatia)

Acta Chimica Slovenica, 2006

Research paper thumbnail of Impact of soil hydrology on the hydrological recharge of karst regions - A model approach

Research paper thumbnail of BIOFAQs Monthly Report

Research paper thumbnail of Seasonal variation in stable isotopic and hydrogeochemical composition of tufa-depositing water in river Krka, Slovenia

Research paper thumbnail of Carbon and Nitrogen Stable Isotope Fractionation in the Sediment of Lake Bled (Slovenia)

Research paper thumbnail of Ciclos de aridez durante los periodos de deglaciación e interglaciar en el tránsito Pleistoceno medio-superior. Tobas calcáreas del Cañón del Trabaque (Cuenca)

Geotemas ( Madrid ), 2012

Research paper thumbnail of Hydrological investigation of the nonhomogeneous karstic catchment using stable isotopes

EGU General Assembly Conference Abstracts, Apr 1, 2018

Research paper thumbnail of Geochemical and isotopic variations in recent freshwater carbonates in Krka river, Croatia : implication for climate reconstruction

Research paper thumbnail of Trace element records in high mountain lake sediments in NW Slovenia dated by 210 Pb

Research paper thumbnail of Origin of sedimentary organic matter in the surficial sediment of the Bay of Makirina (Croatia)

The stable isotopes of carbon were used to investigate the source of sedimentary organic matter i... more The stable isotopes of carbon were used to investigate the source of sedimentary organic matter in the sediment (peloid mud) from Makirina Bay in the central Adriatic (Croatia). The stable carbon isotope composition (a13C) of sedimentary organic matter in the surficial sediment, as well as of aquatic plants from the Bay of Makirina and of terrestrial plants from the coastal area was determined. Using the differences in a13C values between marine and terrestrial organic matter and considering that the phytoplankton is relatively unimportant, the origin of sedimentary organic matter in surficial sediment was estimated. For determination of marine and terrestrial contributions to sedimentary organic matter a simple mixing ranges from 4-69%. The terrigenous fraction is much higher (30-69%) in the southern and coastal part of Makirina Bay and indicates the prevailing influence of terrestrial organic matter. In the central part of the bay aquatic plants are probably of great importance and the percentage of terrigenous fraction is much lower (4-30%).

Research paper thumbnail of Applications of stable oxygen and hydrogen isotopes in hydrological research: Slovenian experience

Research paper thumbnail of Benthic organisms as ecological indicators for the status assessment of coastal ecosystems

Journal of the Marine Biological Association of the United Kingdom, Aug 24, 2017

The presence of potentially toxic elements (PTE) was determined in different tissues of five sele... more The presence of potentially toxic elements (PTE) was determined in different tissues of five selected marine organisms. The As, Cd, Cu, Mn, Mo, Ni, Pb and Zn concentrations were measured in the seagrassCymodocea nodosa, the green algaCladophora echinus, the red algaGelidiella lubrica, the marine topshellPhorcus turbinatusand the littoral crabCarcinus aestuarii, as well as in seawater from Makirina Bay. The levels of As, Cd, Cu, Mn and Zn in the biota were found to exceed those in previously analysed sediments, indicating the bioaccumulation of these PTE. The biota-sediment accumulation factor (BSAF) and concentration factor (CF) varied among different organisms. As regards the five selected species,C. nodosa,C. echinusandG. lubricaproved to be the strongest accumulators of Mn, whileP. turbinatusandC. aestuariishowed a high capacity to accumulate As, Cd, Cu and Zn. These species can be considered as good ecological indicators in the assessment of PTE pollution in marine littoral environments.

Research paper thumbnail of Isotope composition of precipitation along the Adriatic Coasts of Croatia and Slovenia

Monitoring of isotope composition of precipitation includes measurements of radioactive isotope t... more Monitoring of isotope composition of precipitation includes measurements of radioactive isotope tritium (3H) and stable isotopes (2H, 18O) in monthly precipitation samples. Isotope composition of precipitation at Zagreb (Croatia) and Ljubljana (Slovenia) have been performed for more than 20 years within the Global Network for Isotopes in Precipitation (GNIP). Within the IAEA CRP "Isotopic composition of precipitation in the Mediterranean Basin in relation to air circulation patterns and climate" the network has been extended since September 2000 to several stations along the Adriatic coast. Here we present tritium activity and stable isotope content in monthly precipitation samples at the mentioned stations, together with the corresponding meteorological data: precipitation amount and mean monthly temperature.

Research paper thumbnail of Isotope composition of precipitation along the Adriatic Coasts of Croatia and Slovenia

Monitoring of isotope composition of precipitation includes measurements of radioactive isotope t... more Monitoring of isotope composition of precipitation includes measurements of radioactive isotope tritium (3H) and stable isotopes (2H, 18O) in monthly precipitation samples. Isotope composition of precipitation at Zagreb (Croatia) and Ljubljana (Slovenia) have been performed for more than 20 years within the Global Network for Isotopes in Precipitation (GNIP). Within the IAEA CRP "Isotopic composition of precipitation in the Mediterranean Basin in relation to air circulation patterns and climate" the network has been extended since September 2000 to several stations along the Adriatic coast. Here we present tritium activity and stable isotope content in monthly precipitation samples at the mentioned stations, together with the corresponding meteorological data: precipitation amount and mean monthly temperature.

Research paper thumbnail of Geochemical Characteristics and Distribution of Rare Earth Elements in Makirina Bay Sediments (N. Dalmatia, Republic of Croatia)

Geologica Macedonica, Dec 29, 2014

Research paper thumbnail of Origin and production method traceability of vegetables with stable isotopes - from science to practice

Research paper thumbnail of Stable isotope analysis of major bioelements, multi-element profiling, and discriminant analysis for geographical origins of organically grown potato

Journal of Food Composition and Analysis, Aug 1, 2018

Research paper thumbnail of Determination of geographical origin of commercial tomato through analysis of stable isotopes, elemental composition and chemical markers

Food Control, Jul 1, 2018

Research paper thumbnail of Application of stable isotope analyses as support for determination of hydrological response of nonhomogeneous catchment of the Ljubljanica River

Research paper thumbnail of IMTA VS. TRADITIONAL MUSSEL CULTURE IN THE MEDITERRANEAN (PRELIMINARY RESULTS OF THE PROJECT INOVaDA)

Research paper thumbnail of 15N and 13C Enrichment in Balanus perforatus: Tracers of Municipal Particulate Waste in the Murter Sea (Central Adriatic, Croatia)

Acta Chimica Slovenica, 2006

Research paper thumbnail of Impact of soil hydrology on the hydrological recharge of karst regions - A model approach

Research paper thumbnail of BIOFAQs Monthly Report

Research paper thumbnail of Seasonal variation in stable isotopic and hydrogeochemical composition of tufa-depositing water in river Krka, Slovenia

Research paper thumbnail of Carbon and Nitrogen Stable Isotope Fractionation in the Sediment of Lake Bled (Slovenia)

Research paper thumbnail of Ciclos de aridez durante los periodos de deglaciación e interglaciar en el tránsito Pleistoceno medio-superior. Tobas calcáreas del Cañón del Trabaque (Cuenca)

Geotemas ( Madrid ), 2012

Research paper thumbnail of Hydrological investigation of the nonhomogeneous karstic catchment using stable isotopes

EGU General Assembly Conference Abstracts, Apr 1, 2018

Research paper thumbnail of Geochemical and isotopic variations in recent freshwater carbonates in Krka river, Croatia : implication for climate reconstruction

Research paper thumbnail of Trace element records in high mountain lake sediments in NW Slovenia dated by 210 Pb

Research paper thumbnail of Origin of sedimentary organic matter in the surficial sediment of the Bay of Makirina (Croatia)

The stable isotopes of carbon were used to investigate the source of sedimentary organic matter i... more The stable isotopes of carbon were used to investigate the source of sedimentary organic matter in the sediment (peloid mud) from Makirina Bay in the central Adriatic (Croatia). The stable carbon isotope composition (a13C) of sedimentary organic matter in the surficial sediment, as well as of aquatic plants from the Bay of Makirina and of terrestrial plants from the coastal area was determined. Using the differences in a13C values between marine and terrestrial organic matter and considering that the phytoplankton is relatively unimportant, the origin of sedimentary organic matter in surficial sediment was estimated. For determination of marine and terrestrial contributions to sedimentary organic matter a simple mixing ranges from 4-69%. The terrigenous fraction is much higher (30-69%) in the southern and coastal part of Makirina Bay and indicates the prevailing influence of terrestrial organic matter. In the central part of the bay aquatic plants are probably of great importance and the percentage of terrigenous fraction is much lower (4-30%).