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Gunnarsson, Sara
Publications (6 of 6) Show all publications
Uddh Söderberg, T., Gunnarsson, S., Hogmalm, J., Lindegård, B. & Augustsson, A. (2016). Elevated arsenic exposure via consumption of homegrown vegetables for residents in glassworks villages.. In: : . Paper presented at AS2016: 6th International Congress on Arsenic in the Environment Arsenic Research and Global Sustainability. Stockholm, Sweden.
Open this publication in new window or tab >>Elevated arsenic exposure via consumption of homegrown vegetables for residents in glassworks villages.
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2016 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-60963 (URN)
Conference
AS2016: 6th International Congress on Arsenic in the Environment Arsenic Research and Global Sustainability. Stockholm, Sweden
Note

Ej belagd 20170323

Available from: 2017-02-27 Created: 2017-02-27 Last updated: 2017-03-23Bibliographically approved
Uddh Söderberg, T., Gunnarsson, S., Hogmalm, J., Lindegård, B. & Augustsson, A. (2015). An assessment of health risks associated with arsenic exposure via consumption of homegrown vegetables near contaminated glassworks sites. Science of the Total Environment, 536, 189-197
Open this publication in new window or tab >>An assessment of health risks associated with arsenic exposure via consumption of homegrown vegetables near contaminated glassworks sites
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2015 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 536, p. 189-197Article in journal (Refereed) Published
Abstract [en]

The health risk posed by arsenic in vegetables grown in private gardens near 22 contaminated glassworks sites was investigated in this study. Firstly, vegetable (lettuce and potato) and soil samples were collected and arsenic concentrations measured to characterize the arsenic uptake in the selected crops. Secondly, a probabilistic exposure assessment was conducted to estimate the average daily intake (ADI(veg)), which was then evaluated against toxicological reference values by the calculation of hazard quotients (HQs) and cancer risks (CRs). The results show that elevated arsenic concentrations in residential garden soils are mirrored by elevated concentrations in vegetables, and that consumption of these vegetables alone may result in an unacceptable cancer risk; the calculated reasonable maximum exposure, for example, corresponded to a cancer incidence 20 times higher than the stated tolerance limit. However, the characterization of risk depends to a great extent on which toxicological reference value is used for comparison, as well as how the exposure is determined. Based on the assumptions made in the present study, the threshold levels for chronic non-carcinogenic or acute effects were not exceeded, but the cancer risks indicated highlight the need for further exposure studies, as dietary intake involves more than just homegrown vegetables and total exposure is a function of more than just one exposure pathway. In addition, glassworks sites - and contaminated sites in general - contain multiple contaminants, affecting the final and total risk.

National Category
Environmental Sciences Occupational Health and Environmental Health
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-45580 (URN)10.1016/j.scitotenv.2015.07.018 (DOI)000361189800022 ()26204055 (PubMedID)2-s2.0-84937439603 (Scopus ID)
Available from: 2015-07-31 Created: 2015-07-31 Last updated: 2018-01-11Bibliographically approved
Reinap, A., Wiman, B. L. B., Svenningsson, B. & Gunnarsson, S. (2012). Forest-edge effects on sea-salt aerosol deposition: a wind-tunnel study using living oak leaves. Boreal environment research, 17(3-4), 193-209
Open this publication in new window or tab >>Forest-edge effects on sea-salt aerosol deposition: a wind-tunnel study using living oak leaves
2012 (English)In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 17, no 3-4, p. 193-209Article in journal (Refereed) Published
Abstract [en]

Landscape patchiness creates aerodynamic transitions zones that affect the exchange of nutrients and pollutants between the atmosphere and vegetation. Using an artificially generated NaCl aerosol, with its mass-versus-particle-size distribution characterised by an aerodynamic mean particle diameter of 1.6 µm and a geometrical standard deviation of 1.9, we investigate the forest-edge effect on aerosol deposition within a model oak (Quercus robur L.) canopy in a wind tunnel with a smooth up-wind surface, and provide quantitative estimates of deposition rates within the emulated beach-to-forest transition. The deposition rate is maximal around the forest edge with an enhancement factor in relation to the beach deposition of 2.4 for Cl- and 2.0 for Na+. Results are in reasonable agreement with those obtained from deposition models, field studies, and other wind-tunnel based investigations. We find a tendency towards an edge effect also at the downwind forest end, which is in support of model predictions. Estimates of deposition velocities at the edge are 0.06 cms-1 and 0.05 cms-1 for Cl- and Na+, respectively. Because of the edge effect the model forest’s deposition velocity is enhanced, being 1.4 times higher around the edge in comparison with the entire forest. This suggests that field measurements of deposition in the interior of a forest “island” in an otherwise open landscape would underestimate the deposition to the entire forest. Our results can help improve estimates of aerosol-borne inputs of nutrients or pollutants to forests that would experience shifts in meteorological regimes due to changes in climate and forestry practices, in particular with respect to deciduous species in coastal environments where forest-edge effects might be substantial.

 

Keywords
Quercus robur, deposition velocity, wind tunnel, sea/land transition, atmosphere/canopy exchange
National Category
Environmental Sciences
Research subject
Environmental Science, Natural Resources Management
Identifiers
urn:nbn:se:lnu:diva-11856 (URN)
Available from: 2011-05-23 Created: 2011-05-23 Last updated: 2017-12-11Bibliographically approved
Reinap, A., Wiman, B. L. B., Gunnarsson, S. & Svenningsson, B. (2010). Dry deposition of NaCl aerosols: theory and method for a modified leaf-washing technique. Atmospheric Measurement Techniques Discussions, 3(4), 3851-3876
Open this publication in new window or tab >>Dry deposition of NaCl aerosols: theory and method for a modified leaf-washing technique
2010 (English)In: Atmospheric Measurement Techniques Discussions, ISSN 1867-8610, E-ISSN 1867-8610, Vol. 3, no 4, p. 3851-3876Article in journal (Refereed) Published
Abstract [en]

Within the framework of aerosol deposition to vegetation we present a specially designed leaf wash-off method used in a wind-tunnel based study, where leaves of Quercus robur L. were exposed to NaCl aerosols. We summarise the principles and illustrate the method for two types of substances, the chloride ion and the sodium ion, and for two levels of aerosol exposure prior to leaf washing. On the average, in the low-exposure experiments (S1), the 1st (2nd) wash-off step provided 90% (96%) of the amount of Cl− on the leaves. In the high-exposure experiments (S2) the corresponding values were 96% and 99%. For sodium, the general dynamics resembles that of chloride, but the amounts washed off were, in both series, on the average below what would be expected if the equivalent ratio in the tunnel aerosol were to be preserved. Na+ showed adsorption and/or absorption at the leaf surfaces. The difference between the mean values of the amounts of chloride and of sodium washed off in S1 was not statistically significant, the mean Na+ to Cl− difference as a fraction of Cl− being minus 18%±27%; corresponding values for S2 were minus 16%±9%, however (p<0.05). In the latter case, 101±57 μequiv Na+ per m2 of leaf area were missing for the equivalent relationship 1:1 with Cl− to be met. Although uncertainties are thus large, this indicates the magnitude of the Na+-retention. The method is suitable not only for chloride, an inexpensive and easy-to-handle tracer, but also for sodium under exposure at high aerosol concentrations. Our findings will help design further studies of aerosol/forest interactions.

Place, publisher, year, edition, pages
Copernicus Publications on behalf of the European Geosciences Union, 2010
Keywords
aerosol deposition, sodium ion, chloride ion, Quercus robur leaves
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-11854 (URN)10.5194/amtd-3-3851-2010 (DOI)
Available from: 2011-05-23 Created: 2011-05-23 Last updated: 2017-12-11Bibliographically approved
Reinap, A., Wiman, B. L. B., Svenningsson, B. & Gunnarsson, S. (2009). Oak leaves as aerosol collectors. In: Proceedings of the Nordic Society for Aerosol Research (NOSA) Symposium, Lund, November 12-13, 2009: . Paper presented at Nordic Society for Aerosol Research (NOSA) Symposium. Lund
Open this publication in new window or tab >>Oak leaves as aerosol collectors
2009 (English)In: Proceedings of the Nordic Society for Aerosol Research (NOSA) Symposium, Lund, November 12-13, 2009, Lund, 2009Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Lund: , 2009
Research subject
Environmental Science, Natural Resources Management; Natural Science, Physics
Identifiers
urn:nbn:se:lnu:diva-4978 (URN)
Conference
Nordic Society for Aerosol Research (NOSA) Symposium
Note

Nummer:

Available from: 2010-04-28 Created: 2010-04-28 Last updated: 2014-05-15Bibliographically approved
Reinap, A., Wiman, B. L. B., Svenningsson, B. & Gunnarsson, S. (2009). Oak leaves as aerosol collectors: relationships with wind velocity and particle size distribution. Experimental results and their implications. Trees, 23(6), 1263-1274
Open this publication in new window or tab >>Oak leaves as aerosol collectors: relationships with wind velocity and particle size distribution. Experimental results and their implications
2009 (English)In: Trees, ISSN 0931-1890, E-ISSN 1432-2285, Vol. 23, no 6, p. 1263-1274Article in journal (Refereed) Published
Abstract [en]

Advancing the understanding of the aerosol-capture efficiencies of forest components such as leaves and needles, and of the mechanisms that underpin these efficiencies, is essential to the many related issues of forest turnover of nutrients and pollutants. For idealized collectors (such as artificial plates or cylinders) aerosol-mechanics offers a means for calculating capture efficiencies. For living collectors, in particular deciduous leaves, experimental investigations become necessary to assist in formulating the sub-models of capture efficiency that are fundamental to the modelling of fluxes of aerosol-borne substances to forests. We here present wind-tunnel based methods and results for leaves of Quercus robur L. exposed to an aerosol whose mass versus aerodynamic particle size distribution is characterised by a geometric mean aerodynamic particle diameter around 1.2 mu m and a geometric standard deviation around 1.8. With respect to that distribution, and founded on a specially designed leaf wash-off method, we obtained average oak-leaf capture efficiencies ranging from 0.006% of the approaching aerosol mass flux at wind-speed 2 ms(-1) to 0.012% of the flux at wind-speeds 10 ms(-1), respectively. These values can be translated into deposition velocities (V (d) ) for a leaf ensemble with a given leaf area index (LAI). With LAI in the range 2-5 (commonly found in the field) and for wind-speeds 2, 5 and 10 ms(-1), resulting V (d) -values would be 0.02-0.05, 0.05-0.13, and 0.2-0.6 cm/s, respectively. To the extent comparisons are possible, our capture efficiency values are at the low end of the range of values reported by other researchers. The strong wind-speed sensitivity of V (d) has implications for the deposition of aerosol-borne substances to forests for which wind regimes may shift as a result of climatic and land-use changes.

National Category
Environmental Sciences
Research subject
Environmental Science, Natural Resources Management; Natural Science, Physics; Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-2104 (URN)10.1007/s00468-009-0366-4 (DOI)000271504800013 ()
Available from: 2010-04-06 Created: 2010-04-06 Last updated: 2017-12-12Bibliographically approved
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