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  • 1.
    Babakhani, Peyman
    et al.
    Islamic Azad University, Tehran Science and Research Branch, Department of Hydrology Engineering, Tehran, Iran.
    Fagerlund, Fritjof
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Luft-, vatten och landskapslära. Colorado School of Mines, Center for Experimental Study of Subsurface Environmental Processes, Golden, CO, USA.
    Shamsai, Abolfazl
    Islamic Azad University, Tehran Science and Research Branch, Department of Hydrology Engineering, Tehran, Iran; Sharif University of Technology, Department of Civil Engineering, Tehran, Iran.
    Lowry, Gregory Victor
    Carnegie Mellon University, Center for Environmental Implications of Nanotechnology (CEINT), Pittsburgh, PA, USA; Carnegie Mellon University, Department of Civil and Environmental Engineering, Pittsburgh, PA, USA.
    Phenrat, Tanapon
    Naresuan University, Faculty of Engineering, Department of Civil Engineering, Research Unit for Integrated Natural Resources Remediation and Reclamation (IN3R), Phitsanulok, Thailand; Naresuan University, Faculty of Engineering, Center of Excellence for Sustainability of Health, Environment and Industry (SHE&I), Phitsanulok, Thailand.
    Modified MODFLOW-based model for simulating the agglomeration and transport of polymer-modified Fe0 nanoparticles in saturated porous media2018Ingår i: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 25, nr 8, s. 7180-7199Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The solute transport model MODFLOW has become a standard tool in risk assessment and remediation design. However, particle transport models that take into account both particle agglomeration and deposition phenomena are far less developed. The main objective of the present study was to evaluate the feasibility of adapting the standard code MODFLOW/MT3D to simulate the agglomeration and transport of three different types of polymer-modified nanoscale zerovalent iron (NZVI) in one-dimensional (1-D) and two-dimensional (2-D) saturated porous media. A first-order decay of the particle population was used to account for the agglomeration of particles. An iterative technique was used to optimize the model parameters. The model provided good matches to 1-D NZVI-breakthrough data sets, with R 2 values ranging from 0.96 to 0.99, and mass recovery differences between the experimental results and simulations ranged from 0.1 to 1.8 %. Similarly, simulations of NZVI transport in the heterogeneous 2-D model demonstrated that the model can be applied to more complicated heterogeneous domains. However, the fits were less good, with the R 2 values in the 2-D modeling cases ranging from 0.75 to 0.95, while the mass recovery differences ranged from 0.7 to 6.5 %. Nevertheless, the predicted NZVI concentration contours during transport were in good agreement with the 2-D experimental observations. The model provides insights into NZVI transport in porous media by mathematically decoupling agglomeration, attachment, and detachment, and it illustrates the importance of each phenomenon in various situations.

  • 2.
    Bravo, Andrea G.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
    Loizeau, Jean-Luc
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Dranguet, Perrine
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Makri, Stamatina
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Bjorn, Erik
    Umea Univ, Dept Chem, SE-90187 Umea, Sweden..
    Ungureanu, Viorel Gh.
    Univ Bucharest, Fac Geol & Geophys, Bucharest, Romania.;GeoEcoMar, Natl Res & Dev Inst Marine Geol & Geoecol, Bucharest, Romania..
    Slaveykova, Vera I.
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Cosio, Claudia
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)2016Ingår i: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 23, nr 11, s. 10529-10541Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Chlor-alkali plants using mercury (Hg) cell technology are acute point sources of Hg pollution in the aquatic environment. While there have been recent efforts to reduce the use of Hg cells, some of the emitted Hg can be transformed to neurotoxic methylmercury (MeHg). Here, we aimed (i) to study the dispersion of Hg in four reservoirs located downstream of a chlor-alkali plant along the Olt River (Romania) and (ii) to track the activity of bacterial functional genes involved in Hg methylation. Total Hg (THg) concentrations in water and sediments decreased successively from the initial reservoir to downstream reservoirs. Suspended fine size particles and seston appeared to be responsible for the transport of THg into downstream reservoirs, while macrophytes reflected the local bioavailability of Hg. The concentration and proportion of MeHg were correlated with THg, but were not correlated with bacterial activity in sediments, while the abundance of hgcA transcript correlated with organic matter and Cl- concentration, indicating the importance of Hg bioavailability in sediments for Hg methylation. Our data clearly highlights the importance of considering Hg contamination as a legacy pollutant since there is a high risk of continued Hg accumulation in food webs long after Hg-cell phase out.

  • 3. Daneshvar, Atlasi
    et al.
    Svanfelt, Jesper
    Kronberg, Leif
    Weyhenmeyer, Gesa A.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
    Winter accumulation of acidic pharmaceuticals in a Swedish river2010Ingår i: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 17, nr 4, s. 908-916Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study, seasonal variations in the concentration profile of four analgesics and one lipid regulator were monitored on their way from a wastewater treatment plant (WWTP) effluent, along a river, and into a lake. From December 2007 to December 2008, water samples were collected monthly (n = 12) from an upstream point, the effluent, four downstream points of the WWTP, and at the point where the river merges with the lake, and the concentrations of ibuprofen, naproxen, bezafibrate, diclofenac, and ketoprofen were determined. The analytical methodology involved solid-phase extraction of the target compounds from water samples followed by liquid chromatography coupled with tandem mass spectrometry for compound separation and detection. The studied pharmaceuticals were found in the effluent at concentrations ranging from 31 to 1,852 ng l(-1) depending on the season. In the river and lake, the concentrations were much lower (6-400 ng l(-1)) mainly due to dilution but also to a season-dependent contribution from natural transformation processes. The mean mass flow of all analgesics was highest during winter while the highest mean mass flow of the lipid regulator bezafibrate was observed in spring. The WWTP is the main source of the target compounds in the aquatic environment. The observed winter accumulation signifies the importance of natural transformation processes, which can only be estimated based on mass flow data, on the fate of pharmaceuticals in the environment.

  • 4.
    Lampa, Erik
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm, Uppsala kliniska forskningscentrum (UCR).
    Eguchi, Akifumi
    Chiba Univ, Ctr Prevent Med Sci, Chiba, Japan.
    Todaka, Emiko
    Chiba Univ, Ctr Prevent Med Sci, Chiba, Japan.
    Mori, Chisato
    Chiba Univ, Ctr Prevent Med Sci, Chiba, Japan.
    Fetal exposure markers of dioxins and dioxin-like PCBs2018Ingår i: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 25, nr 12, s. 11940-11947Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fetal exposure to polychlorinated biphenyls (PCBs), polychlorinated-p-dibenzodioxins (PCDDs), and polychlorinated dibenzofurans (PCDFs) have been associated with a number of adverse health outcomes. Although the placenta acts as a barrier between the mother and the fetus, these contaminants transfer through the placenta exposing the fetus. Several studies have investigated placental transfer, but few have assessed the co-variation among these contaminants. Maternal blood, cord blood, and cord tissue were collected from 41 Japanese mother-infant pairs and analyzed for dioxin-like PCBs and PCDD/Fs. Hierarchical cluster analysis followed by principal component analysis were used to assess the co-variation. Two stable clusters of dioxin-like PCBs were found in maternal and cord blood. One cluster of low/medium chlorinated dioxin-like PCBs was present in all three matrices with 2,3',4,4',5-PeCB(#118) and 3,3',4,4',5-PeCB(#126) explaining the majority of the clusters' variances. Medium/high chlorinated dioxin-like PCBs clustered in maternal blood and cord blood but not in cord tissue. 2,3,4,4',5-PeCB(#114) and 2,3,3',4,4',5,5'-HpCB(#189) explained the majority of the clusters' variances. There was a substantial correlation between the sum of dioxin-like PCBs and total PCDD/F in all three matrices. The sum of the four suggested PCBs plus 3,3',4,4'-TeCB(#77) correlated well with total PCDD/F in all three matrices. Apart from the dioxin-like PCBs, little co-variation existed among the studied contaminants. The five PCBs can be used as fetal exposure markers for dioxin and dioxin-like PCBs in maternal and cord blood respectively. In cord tissue, more higher chlorinated dioxin-like PCBs need to be measured as well.

  • 5.
    Liu, Jiang
    et al.
    Southwest Univ, Coll Resources & Environm, Dept Environm Sci & Engn, Chongqing 400715, Peoples R China.
    Jiang, Tao
    Southwest Univ, Coll Resources & Environm, Dept Environm Sci & Engn, Chongqing 400715, Peoples R China;Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden.
    Kothawala, Dolly
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
    Wang, Qilei
    Southwest Univ, Coll Resources & Environm, Dept Environm Sci & Engn, Chongqing 400715, Peoples R China.
    Zhao, Zheng
    Southwest Univ, Coll Resources & Environm, Dept Environm Sci & Engn, Chongqing 400715, Peoples R China;Environm Monitoring Cent Stn Guizhou Prov, Guiyang 550081, Guizhou, Peoples R China.
    Wang, Dingyong
    Southwest Univ, Coll Resources & Environm, Dept Environm Sci & Engn, Chongqing 400715, Peoples R China.
    Mu, Zhijian
    Southwest Univ, Coll Resources & Environm, Dept Environm Sci & Engn, Chongqing 400715, Peoples R China.
    Zhang, Jinzhong
    Southwest Univ, Coll Resources & Environm, Dept Environm Sci & Engn, Chongqing 400715, Peoples R China.
    Rice-paddy field acts as a buffer system to decrease the terrestrial characteristics of dissolved organic matter exported from a typical small agricultural watershed in the Three Gorges Reservoir Area, China2019Ingår i: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 26, nr 23, s. 23873-23885Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Agricultural watersheds are a crucial contributor of terrestrial dissolved organic matter (DOM) for the adjacent aquatic environment. Recently, ecological engineering of the buffer zone such as a rice-paddy field was established to reduce the export of nutrients and contaminants from a small agricultural watershed. However, the potential of the rice-paddy field to reduce the terrestrial signature of DOM is unclear. Therefore, two small agricultural sub-catchments (i.e., sub-1 and sub-2) with different land uses and hill slope angles in the Three Gorges Reservoir (TGR) area of China were studied from 2014 to 2015. The results showed that the terrestrial DOM signals are indicated by optical indices (SUVA(254), S-R, fluorescence index) in the steeper and more forest covered, but rice-paddy field buffered sub-catchment (i.e., sub-2) decreased significantly, as compared to the reference sub-catchment (i.e., sub-1). Regardless of seasonal variations, the rice-paddy field retained a buffering role to reduce the terrestrial property of DOM and the highest capacity was observed during the rice-growth period. However, during storm events, the differences of DOM properties for two sub-catchments were not significant, because the buffer system was weakened. Finally, environmental implications of the role of such a buffer zone in the TGR areas are discussed. These results demonstrate that rice-paddy fields are successful in mitigating the terrestrial property of exported DOM, but the weaker performance during storm events still needs to be considered.

  • 6. Ruuskanen, Suvi
    et al.
    Laaksonen, Toni
    Morales, Judith
    Moreno, Juan
    Mateo, Rafael
    Belskii, Eugen
    Bushuev, Andrey
    Jarvinen, Antero
    Kerimov, Anvar
    Krams, Indrikis
    Morosinotto, Chiara
    Maend, Raivo
    Orell, Markku
    Qvarnström, Anna
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Zooekologi.
    Slater, Fred
    Tilgar, Vallo
    Visser, Marcel E.
    Winkel, Wolfgang
    Zang, Herwig
    Eeva, Tapio
    Large-scale geographical variation in eggshell metal and calcium content in a passerine bird (Ficedula hypoleuca)2014Ingår i: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 21, nr 5, s. 3304-3317Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Birds have been used as bioindicators of pollution, such as toxic metals. Levels of pollutants in eggs are especially interesting, as developing birds are more sensitive to detrimental effects of pollutants than adults. Only very few studies have monitored intraspecific, large-scale variation in metal pollution across a species' breeding range. We studied large-scale geographic variation in metal levels in the eggs of a small passerine, the pied flycatcher (Ficedula hypoleuca), sampled from 15 populations across Europe. We measured 10 eggshell elements (As, Cd, Cr, Cu, Ni, Pb, Zn, Se, Sr, and Ca) and several shell characteristics (mass, thickness, porosity, and color). We found significant variation among populations in eggshell metal levels for all metals except copper. Eggshell lead, zinc, and chromium levels decreased from central Europe to the north, in line with the gradient in pollution levels over Europe, thus suggesting that eggshell can be used as an indicator of pollution levels. Eggshell lead levels were also correlated with soil lead levels and pH. Most of the metals were not correlated with eggshell characteristics, with the exception of shell mass, or with breeding success, which may suggest that birds can cope well with the current background exposure levels across Europe.

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