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Gustafsson, Jon PetterORCID iD iconorcid.org/0000-0001-8771-7941
Alternative names
Publications (10 of 115) Show all publications
Braun, S., Warrinnier, R., Börjesson, G., Ulén, B., Smolders, E. & Gustafsson, J. P. (2019). Assessing the ability of soil tests to estimate labile phosphorus in agricultural soils: Evidence from isotopic exchange. Geoderma, 337, 350-358
Open this publication in new window or tab >>Assessing the ability of soil tests to estimate labile phosphorus in agricultural soils: Evidence from isotopic exchange
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2019 (English)In: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 337, p. 350-358Article in journal (Refereed) Published
Abstract [en]

Efficient phosphorus (P) fertilization strategies are essential for intensive crop production with minimal negative environmental impacts. A key factor in sustainable P use is assessment of the plant available soil P pool using soil P tests. This study determined isotopically exchangeable P after six days of reaction with 33PO4 (P-E (6 d)) to determine how accurately two commonly used P tests, Olsen and AL (acid ammonium acetate lactate) can quantify the amount of labile P. Soil samples were taken from both highly P-amended and unamended plots at six sites within the Swedish long-term soil fertility experiments. According to P K-edge XANES spectroscopy, the P speciation was dominated by Al-bound P and organic P, with additional contributions from Fe-bound P and Ca phosphates in most soils. The results showed that the AL test overestimated P-E (6 d) by a factor of 1.70 on average. In contrast, the Olsen test underestimated P-E (6 d), with the mean ratios of P-Olsen to P-E (6 d) being 0.52 for high-P and 0.19 for low-P soils. The 33P/31P ratio in the Olsen extract of a 33PO4 spiked soil was closer to that of a 0.005 mol L−1 CaCl2 soil extract than the corresponding ratio in the AL extract, suggesting that AL extraction solubilized more non-labile P. In conclusion, the AL and Olsen methods are not suitable for direct quantification of the isotopically exchangeable soil P pool after 6 days of equilibration. However, based on the results, Olsen may be superior to AL for classification of soil P status, due to its even performance for calcareous and non-calcareous soils and lower extraction of non-labile P.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Chemical analysis, Isotopes P-33, Isotopic exchange kinetic technique, Phosphorus, Soil P test, Soils, Chlorine compounds, Cultivation, Environmental impact, Extraction, Isotopes, Soil testing, X ray absorption near edge structure spectroscopy, Agricultural soils, Ammonium acetate, Crop production, IS assessment, Isotopic exchange, Isotopic exchange kinetics, Noncalcareous soils, Soil fertility
National Category
Other Agricultural Sciences
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-236319 (URN)10.1016/j.geoderma.2018.09.048 (DOI)000456761500036 ()2-s2.0-85054011888 (Scopus ID)
Note

QC 20181120

Available from: 2018-11-20 Created: 2018-11-20 Last updated: 2019-04-12Bibliographically approved
McGivney, E., Gustafsson, J. P., Belyazid, S., Zetterberg, T. & Lofgren, S. (2019). Assessing the impact of acid rain and forest harvest intensity with the HD-MINTEQ model - soil chemistry of three Swedish conifer sites from 1880 to 2080. SOIL, 5(1), 63-77
Open this publication in new window or tab >>Assessing the impact of acid rain and forest harvest intensity with the HD-MINTEQ model - soil chemistry of three Swedish conifer sites from 1880 to 2080
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2019 (English)In: SOIL, ISSN 2199-3971, Vol. 5, no 1, p. 63-77Article in journal (Refereed) Published
Abstract [en]

Forest soils are susceptible to anthropogenic acidification. In the past, acid rain was a major contributor to soil acidification, but, now that atmospheric levels of S have dramatically declined, concern has shifted towards biomass-induced acidification, i.e. decreasing soil solution pH due to tree growth and harvesting events that permanently remove base cations (BCs) from forest stands. We use a novel dynamic model, HD-MINTEQ (Husby Dynamic MINTEQ), to investigate possible long-term impacts of two theoretical future harvesting scenarios in the year 2020, a conventional harvest (CH, which removes stems only), and a whole-tree harvest (WTH, which removes 100 % of the above-ground biomass except for stumps) on soil chemistry and weathering rates at three different Swedish forest sites (Aneboda, Gardsjon, and Kindla). Furthermore, acidification following the harvesting events is compared to the historical acidification that took place during the 20th century due to acid rain. Our results show that historical acidification due to acid rain had a larger impact on pore water chemistry and mineral weathering than tree growth and harvesting, at least if nitrification remained at a low level. However, compared to a no-harvest baseline, WTH and CH significantly impacted soil chemistry. Directly after a harvesting event (CH or WTH), the soil solution pH sharply increased for 5 to 10 years before slowly declining over the remainder of the simulation (until year 2080). WTH acidified soils slightly more than CH, but in certain soil horizons there was practically no difference by the year 2080. Even though the pH in the WTH and CH scenario decreased with time as compared to the no-harvest scenario (NH), they did not drop to the levels observed around the peak of historic acidification (1980-1990), indicating that the pH decrease due to tree growth and harvesting would be less impactful than that of historic atmospheric acidification. Weathering rates differed across locations and horizons in response to historic acidification. In general, the predicted changes in weathering rates were very small, which can be explained by the net effect of decreased pH and increased Al3+, which affected the weathering rate in opposite ways Similarly, weathering rates after the harvesting scenarios in 2020 remained largely unchanged according to the model.

Place, publisher, year, edition, pages
COPERNICUS GESELLSCHAFT MBH, 2019
National Category
Soil Science
Identifiers
urn:nbn:se:kth:diva-244520 (URN)10.5194/soil-5-63-2019 (DOI)000457832800001 ()2-s2.0-85061203472 (Scopus ID)
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-04Bibliographically approved
Shaheen, S. M., Alessi, D. S., Tack, F. M., Ok, Y. S., Kim, K.-H. -., Gustafsson, J. P., . . . Rinklebe, J. (2019). Redox chemistry of vanadium in soils and sediments: Interactions with colloidal materials, mobilization, speciation, and relevant environmental implications - A review. Advances in Colloid and Interface Science, 265, 1-13
Open this publication in new window or tab >>Redox chemistry of vanadium in soils and sediments: Interactions with colloidal materials, mobilization, speciation, and relevant environmental implications - A review
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2019 (English)In: Advances in Colloid and Interface Science, ISSN 0001-8686, E-ISSN 1873-3727, Vol. 265, p. 1-13Article in journal (Refereed) Published
Abstract [en]

Vanadium (V), although serving as an important component of industrial activities, has bioinorganic implications to pose highly toxic hazards to humans and animals. Soils and sediments throughout the world exhibit wide ranges of vanadium concentrations. Although vanadium toxicity varies between different species, it is mainly controlled by soil redox potential (E H ). Nonetheless, knowledge of the redox geochemistry of vanadium lags in comparison to what is known about other potentially toxic elements (PTEs). In particular, the redox-induced speciation and mobilization of vanadium in soils and sediments and the associated risks to the environment have not been reviewed to date. Therefore, this review aims to address 1) the content and geochemical fate of vanadium in soils and sediments, 2) its redox-induced release dynamics, 3) redox-mediated chemical reactions between vanadium and soil organic and inorganic colloidal materials in soil solution, 4) its speciation in soil solution and soil-sediments, and 5) the use of advanced geochemical and spectroscopic techniques to investigate these complex systems. Vanadium (+5) is the most mobile and toxic form of its species while being the thermodynamically stable valence state in oxic environments, while vanadium (+3) might be expected to be predominant under euxinic (anoxic and sulfidic) conditions. Vanadium can react variably in response to changing soil E H : under anoxic conditions, the mobilization of vanadium can decrease because vanadium (+5) can be reduced to relatively less soluble vanadium (+4) via inorganic reactions such as with H 2 S and organic matter and by metal-reducing microorganisms. On the other hand, dissolved concentrations of vanadium can increase at low E H in many soils to reveal a similar pattern to that of Fe, which may be due to the reductive dissolution of Fe(hydr)oxides and the release of the associated vanadium. Those differences in vanadium release dynamics might occur as a result of the direct impact of E H on vanadium speciation in soil solution and soil sediments, and/or because of the E H -dependent changes in soil pH, chemistry of (Fe)(hydr)oxides, and complexation with soil organic carbon. Release dynamics of vanadium in soils may also be affected positively by soil pH and the release of aromatic organic compounds. X-ray absorption spectroscopy (XAS) is a powerful tool to investigate the speciation of vanadium present in soil. X-ray absorption near edge structure (XANES) is often used to constrain the average valence state of vanadium in soils and sediments, and in limited cases extended X-ray absorption fine structure (EXAFS) analysis has been used to determine the average molecular coordination environment of vanadium in soil components. In conclusion, this review presents the state of the art about the redox geochemistry of vanadium and thus contributes to a better understanding of the speciation, potential mobilization, and environmental hazards of vanadium in the near-surface environment of uplands, wetlands, and agricultural ecosystems as affected by various colloidal particles. Further research is needed to elucidate the geochemistry and speciation of vanadium in the dissolved, colloidal, and soil sediments phases, including the determination of factors that control the redox geochemistry of vanadium.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Colloidal materials, Redox potential, Sediments, Vanadium, Wetland soils
National Category
Soil Science
Identifiers
urn:nbn:se:kth:diva-244323 (URN)10.1016/j.cis.2019.01.002 (DOI)000461535800001 ()30685738 (PubMedID)2-s2.0-85060325973 (Scopus ID)
Note

QC 20190220

Available from: 2019-02-20 Created: 2019-02-20 Last updated: 2019-04-05Bibliographically approved
Gustafsson, J. P. (2019). Vanadium geochemistry in the biogeosphere -speciation, solid-solution interactions, and ecotoxicity. APPLIED GEOCHEMISTRY, 102, 1-25
Open this publication in new window or tab >>Vanadium geochemistry in the biogeosphere -speciation, solid-solution interactions, and ecotoxicity
2019 (English)In: APPLIED GEOCHEMISTRY, Vol. 102, p. 1-25Article, review/survey (Refereed) Published
Abstract [en]

Vanadium is a metal that receives increasing attention due to its possible toxicity and its increased use in society, i.e. in high-grade steel and in vanadium redox-flow batteries. Already today, the global biogeochemical cycle of vanadium is heavily impacted by human activities, and these impacts will probably increase. The total V concentration in the upper part of the Earth's crust, and in soils, is near 100 mg V kg(-1). Usually, the dissolved V concentration is low. In seawater the mean dissolved V concentration is 1.8 mu g L-1, and in freshwaters the concentration is commonly below 1 mu g L-1 although in areas with volcanic and sedimentary rocks it may be much higher, i.e. at the slopes of Mt. Etna, Italy, concentrations of up to 180 mu g V L-1 have been recorded. Vanadium is a redox-sensitive element, which occurs in three oxidation states (+III, +IV and +V) in the environment. Whereas vanadium(V) usually occurs as the oxyanion vanadate(V) under most environmental conditions, vanadyl(IV) is an oxocation that is stable at low pH and/or mildly reducing conditions, particularly when the organic matter concentration is high. Vanadium(III), which is the least studied form of vanadium, occurs under strongly reducing conditions. All vanadium forms are strongly bound to environmental sorbents: vanadate(V) is bound as a bidentate complex to iron, aluminium, and titanium (hydr)oxides, and with a stronger affinity than that of orthophosphate (o-phosphate). Vanadyl(IV) is strongly complexed to natural organic matter, while vanadium(III) may substitute for other trivalent ions in mineral structures. Despite this, vanadium may be mobilized to the aqueous phase, for example under high-pH conditions. Studies with V K-edge XANES spectroscopy have shown that most oxic soils usually contain a mixture of vanadium(IV) that is octahedrally coordinated in primary minerals, and surface-bound vanadate(V) on iron and aluminium (hydr) oxides, although acid organic soils are dominated by organically complexed vanadyl(IV). In reduced environments, such as in sediments and black shales, available evidence suggests that the V consists of a mixture of organically complexed vanadyl(IV) and unknown vanadium(III) species. However, considerable uncertainty exists on the V speciation under reducing conditions, and additional research is recommended. Vanadium is essential for some species of cyanolichens and algae due to its presence in vanadium nitrogenase, which can be important for N fixation in boreal ecosystems, and in vanadium haloperoxidases, which mediate the oxidation of halides, particularly iodine and bromine. In certain organisms vanadium is accumulated for unknown reasons, e.g. in ascidians, where V accumulates as a vanadium(III) complex with organic S, and in Amanita mushrooms, in which amavadin, a stable vanadium(IV)-organic complex, is accumulated. However, at high concentrations vanadium is toxic to many organisms. This is mostly due to its interference with o-phosphate in a number of biomolecules. Available evidence shows that toxic effects appear in the mg V L-1 range for most studied species. However, some organisms, i.e. algae and possibly some soil bacteria, are more sensitive. In soils, the toxic response is related to the soil solution V concentration, rather than to the solid-phase concentration. The o-phosphate concentration has been identified as a parameter that influences toxicity, but the relationship between the P status and the environmental risk of V toxicity is not yet well determined - as a result risk-based guidelines remain uncertain. There is urgent need for more research on this topic. Vanadium, being a redox-sensitive element, responds to sudden environmental change such as flooding that leads to decreased redox potential. In most, but not all, cases, an increased solubilisation of vanadium is observed after flooding, which can be attributed to reductive dissolution of vanadate(V)-sorbing iron (hydr)oxides and to vanadate(V) reduction to vanadyl(IV) that forms stable complexes with dissolved organic matter. The vanadium redox conversions are carried out by a large number of genera of bacteria. Bioremediation methods are being developed that may reduce vanadate(V) to vanadyl(IV), which may reduce the bioavailability of vanadium in many soils.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
Vanadate, Vanadyl, Water, Soil, Sediment, Bioavailability
National Category
Environmental Management
Identifiers
urn:nbn:se:kth:diva-246245 (URN)10.1016/j.apgeochem.2018.12.027 (DOI)000459789000001 ()2-s2.0-85060105150 (Scopus ID)
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-04Bibliographically approved
Gustafsson, J. P., Belyazid, S., McGivney, E. & Löfgren, S. (2018). Aluminium and base cation chemistry in dynamic acidification models - need for a reappraisal?. SOIL, 4(4), 237-250
Open this publication in new window or tab >>Aluminium and base cation chemistry in dynamic acidification models - need for a reappraisal?
2018 (English)In: SOIL, ISSN 2199-3971, Vol. 4, no 4, p. 237-250Article in journal (Refereed) Published
Abstract [en]

Long-term simulations of the water composition in acid forest soils require that accurate descriptions of aluminium and base cation chemistry are used. Both weathering rates and soil nutrient availability depend on the concentrations of Al3+, of H+, and of base cations (Ca2+, Mg2+, Na+, and K+). Assessments of the acidification status and base cation availability will depend on the model being used. Here we review in what ways different dynamic soil chemistry models describe the processes governing aluminium and base cation concentrations in the soil water. Furthermore, scenario simulations with the HD-MINTEQ model are used to illustrate the difference between model approaches. The results show that all investigated models provide the same type of response to changes in input water chemistry. Still, for base cations we show that the differences in the magnitude of the response may be considerable depending on whether a cation-exchange equation (Gaines-Thomas, Gapon) or an organic complexation model is used. The former approach, which is used in many currently used models (e.g. MAGIC, ForSAFE), causes stronger pH buffering over a relatively narrow pH range, as compared to state-of-the-art models relying on more advanced descriptions in which organic complexation is important (CHUM, HD-MIN PLQ). As for aluminium, a "fixed" gibbsite constant, as used in MAGIC, SMART/VSD, and ForSAFE, leads to slightly more pH buffering than in the more advanced models that consider both organic complexation and Al(OH)(3) (s) precipitation, but in this case the effect is small. We conclude that the descriptions of acid-base chemistry and base cation binding in models such as MAGIC, SMART/VSD, and ForSAFE are only likely to work satisfactorily in a narrow pH range. If the pH varies greatly over time, the use of modern organic complexation models is preferred over cation-exchange equations.

Place, publisher, year, edition, pages
COPERNICUS GESELLSCHAFT MBH, 2018
National Category
Earth and Related Environmental Sciences
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-244146 (URN)10.5194/soil-4-237-2018 (DOI)000457382400001 ()2-s2.0-85055829503 (Scopus ID)
Funder
Swedish Research Council Formas, 2011-1691
Note

QC 20190218

Available from: 2019-02-18 Created: 2019-02-18 Last updated: 2019-04-12Bibliographically approved
Zuo, M., Renman, G., Gustafsson, J. P. & Klysubun, W. (2018). Dual slag filters for enhanced phosphorus removal from domestic waste water: performance and mechanisms. Environmental science and pollution research international, 25(8), 7391-7400
Open this publication in new window or tab >>Dual slag filters for enhanced phosphorus removal from domestic waste water: performance and mechanisms
2018 (English)In: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 25, no 8, p. 7391-7400Article in journal (Refereed) Published
Abstract [en]

The phosphorus (P) removal of five combinations of dual filters consisting of blast furnace slag (BFS), argon oxygen decarburisation slag (AOD) and electric arc furnace slag (EAF) was evaluated in column experiments with domestic waste water. The columns were fed with waste water for 24 days. The column with only EAF had the best P removal performance (above 93% throughout the experiment). The speciation of the bound P was evaluated by P K-edge X-ray absorption near-edge structure (XANES) spectroscopy. In all five columns, the main P species of the slag packed in the outlet chamber was amorphous calcium phosphate (ACP). In samples from the inlet chambers, the contributions from crystalline Ca phosphates, P adsorbed on gibbsite and P adsorbed on ferrihydrite were usually much greater, suggesting a shift of P removal mechanism as the waste water travelled from the inlet to the outlet. The results provide strong evidence that P was predominantly removed by the slags through the formation of ACP. However, as the pH decreased with time due to the progressively lower dissolution of alkaline silicate minerals from the slag, the ACP was rendered unstable and hence redissolved, changing the P speciation. It is suggested that this process strongly affected the lifespan of the slag filters. Of the slags examined, EAF slag had the best P removal characteristics and BFS the worst, which probably reflected different dissolution rates of alkaline silicates in the slags.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2018
Keywords
Metallurgical slags, Calcium phosphate, Phosphate speciation, Precipitation, Adsorption, Metal release
National Category
Environmental Sciences
Identifiers
urn:nbn:se:kth:diva-225206 (URN)10.1007/s11356-017-0925-y (DOI)000427398200029 ()29280098 (PubMedID)2-s2.0-85039055686 (Scopus ID)
Note

QC 20180403

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2018-05-23Bibliographically approved
Kianmeher, P., Alazawi, S. & Gustafsson, J. P. (2018). Enhancement of Physicochemical Properties of Dubai's Sand to Conserve Irrigation Water. In: Firat, S Kinuthia, J AbuTair, A (Ed.), PROCEEDINGS OF 3RD INTERNATIONAL SUSTAINABLE BUILDINGS SYMPOSIUM (ISBS 2017), VOL 1: . Paper presented at 3rd International Sustainable Buildings Symposium (ISBS), MAR 15-17, 2017, U ARAB EMIRATES (pp. 644-654). SPRINGER INTERNATIONAL PUBLISHING AG
Open this publication in new window or tab >>Enhancement of Physicochemical Properties of Dubai's Sand to Conserve Irrigation Water
2018 (English)In: PROCEEDINGS OF 3RD INTERNATIONAL SUSTAINABLE BUILDINGS SYMPOSIUM (ISBS 2017), VOL 1 / [ed] Firat, S Kinuthia, J AbuTair, A, SPRINGER INTERNATIONAL PUBLISHING AG , 2018, p. 644-654Conference paper, Published paper (Refereed)
Abstract [en]

Freshwater scarcity has been a considerable issue in the Gulf Region. The cities in the region including in the UAE depend mainly on seawater desalination. Their demand escalated about 15% annually regardless of seawater desalination direct cost of 1 US$/M-3. Thus, calling all water conservation techniques to reducing indoor and outdoor water demands is inevitable. Using Hydrophobic Sand (HS) to reduce water seepage and increase the contact time between irrigation water and plants' roots was seen as potential conservation technique. The HS is Normal Sand (NS) coated by a thin layer of hydrophobic organic silica compound called trimethylsilanol. However, concerns were raised about the leaching of harmful organic coating chemicals into the soil and groundwater. Assessing the potential risks of leaching additives is one of the objectives of this research. For some plants, requiring a certain range of soil permeability suggests a mixture of NS and HS. The permeability of mixtures of HS with abundant NS was examined to assess its validity and cost effectiveness when a certain permeability is required. Several elements leaching tests were conducted. The soil was classified and constant head permeability test was conducted for different configurations and mixtures of NS and HS. The leached elements, nutrients and organic silica were within the allowable limits set by the typical standards. Further experiments indicates that HS does not constitute an environmental hazard. Mixing different portions of NS and HS revealed unforeseen increase in the permeability. Instead, some layer configurations could reduce soil permeability.

Place, publisher, year, edition, pages
SPRINGER INTERNATIONAL PUBLISHING AG, 2018
Series
Lecture Notes in Civil Engineering, ISSN 2366-2557 ; 6
Keywords
Hydrophobic, Sustainable, Leaching, Permeability, Irrigation
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-238935 (URN)10.1007/978-3-319-63709-9_50 (DOI)000449105000050 ()2-s2.0-85060251982 (Scopus ID)
Conference
3rd International Sustainable Buildings Symposium (ISBS), MAR 15-17, 2017, U ARAB EMIRATES
Note

QC 20181114

Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2019-03-22Bibliographically approved
Tiberg, C., Sjostedt, C. & Gustafsson, J. P. (2018). Metal sorption to Spodosol Bs horizons: Organic matter complexes predominate. Chemosphere, 196, 556-565
Open this publication in new window or tab >>Metal sorption to Spodosol Bs horizons: Organic matter complexes predominate
2018 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 196, p. 556-565Article in journal (Refereed) Published
Abstract [en]

While metal sorption mechanisms have been studied extensively for soil surface horizons, little information exists for subsoils, for example Spodosol Bs horizons. Here the sorption of cadmium(10, copper(II) and lead(II) to seven Bs horizons from five sites was studied. Extended X-ray absorption fine structure (EXAFS) spectroscopy showed that cadmium(II) and lead(II) were bound as inner-sphere complexes to organic matter. Addition of o-phosphate (to 1 mu mol l(-1)) did not result in any significant enhancement of metal sorption, nor did it influence EXAFS speciation. An assemblage model using the SHM and CD-MUSIC models overestimated metal sorption for six out of seven soil samples. To agree with experimental results, substantial decreases (up to 8-fold) had to be made for the fraction 'active organic matter', f(Hs), while the point-of-zero charge (PZC) of ferrihydrite had to be increased. The largest decreases of f(HS) were found for the soils with the lowest ratio of pyrophosphate-to oxalate-extractable Al (Al-pyp/Al-ox), suggesting that in these soils, humic and fulvic acids were to a large extent inaccessible for metal sorption. The low reactivity of ferrihydrite towards lead(II) can be explained by potential spillover effects from co-existing allophane, but other factors such as ferrihydrite crystallisation could not be ruled out. In conclusion, organic matter was the predominant sorbent for cadmium(II), copper(II) and lead(II). However, for lead(II) the optimised model suggests additional, but minor, contributions from Fe (hydr) oxide surface complexes. These results will be important to correctly model metal sorption in spodic materials. 

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2018
Keywords
Cadmium, Copper, Lead, Soil, EXAFS, Assemblage model
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-223773 (URN)10.1016/j.chemosphere.2018.01.004 (DOI)000425075500063 ()29329088 (PubMedID)2-s2.0-85043422259 (Scopus ID)
Note

QC 20180307

Available from: 2018-03-07 Created: 2018-03-07 Last updated: 2018-04-17Bibliographically approved
Renman, G., Zuo, M., Gustafsson, J. P. & Klysybun, W. (2018). Phosphorus removal by slag depends on its mineralogical composition: A comparative study of AOD and EAF slags. Journal of Water Process Engineering, 25, 105-112
Open this publication in new window or tab >>Phosphorus removal by slag depends on its mineralogical composition: A comparative study of AOD and EAF slags
2018 (English)In: Journal of Water Process Engineering, ISSN 2214-7144, Vol. 25, p. 105-112Article in journal (Refereed) Published
Abstract [en]

Electric arc furnace slag (EAF) and argon oxygen decarburization slag (AOD) were investigated in column experiments to determine the effect of mineralogical composition on their P removal performance and lifespan. Polyethylene glycol (PEG) and NaOH solutions were used for pretreatment of the slags to adjust their dissolution properties. The modified slags exhibited better P removal performance at the beginning of the experiment, but had shorter lifespan than the unmodified slags. AOD and EAF modified with PEG and NaOH achieved 100% P removal during the first 84 and 60 pore volumes, respectively, which were ≥20 pore volumes longer than virgin AOD and EAF. However, virgin EAF and AOD both had a P removal efficiency above 90% during the first 280 pore volumes. Possibly, soluble minerals such as free lime are lost during the modification step, causing a decreased long-term P removal capacity. The XRD results showed that the high P removal ability of AOD and EAF was attributed to the dissolution of beta dicalcium silicate (β-C2) and gamma dicalcium silicate (γ-C2S), which were dominant mineral phases in the slags. Results from SEM-EDS analysis revealed significant P accumulation on the slag surface. Cracks on the EAF slag surface contributed to its longer lifespan. Analysis with P K-edge XANES spectroscopy showed that the P retained on the slag surface was dominated by amorphous calcium phosphate, with a substantial amount of carbonate apatite (around 30%). Amorphous calcium phosphate was transformed to crystalline apatite as the slag aged with column operating time.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Engineering and Technology
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-233321 (URN)10.1016/j.jwpe.2018.07.003 (DOI)000444525600014 ()2-s2.0-85050236846 (Scopus ID)
Funder
VINNOVA
Note

QC 20180817

Available from: 2018-08-15 Created: 2018-08-15 Last updated: 2018-10-22Bibliographically approved
Campos Pereira, H., Ullberg, M., Kleja, D. B., Gustafsson, J. P. & Ahrens, L. (2018). Sorption of perfluoroalkyl substances (PFASs) to an organic soil horizon – Effect of cation composition and pH. Chemosphere, 207, 183-191
Open this publication in new window or tab >>Sorption of perfluoroalkyl substances (PFASs) to an organic soil horizon – Effect of cation composition and pH
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2018 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 207, p. 183-191Article in journal (Refereed) Published
Abstract [en]

Accurate prediction of the sorption of perfluoroalkyl substances (PFASs) in soils is essential for environmental risk assessment. We investigated the effect of solution pH and calculated soil organic matter (SOM) net charge on the sorption of 14 PFASs onto an organic soil as a function of pH and added concentrations of Al3+, Ca2+ and Na+. Often, the organic C-normalized partitioning coefficients (KOC) showed a negative relationship to both pH (Δlog KOC/ΔpH = −0.32 ± 0.11 log units) and the SOM bulk net negative charge (Δlog KOC = −1.41 ± 0.40 per log unit molc g−1). Moreover, perfluorosulfonic acids (PFSAs) sorbed more strongly than perfluorocarboxylic acids (PFCAs) and the PFAS sorption increased with increasing perfluorocarbon chain length with 0.60 and 0.83 log KOC units per CF2 moiety for C3–C10 PFCAs and C4, C6, and C8 PFSAs, respectively. The effects of cation treatment and SOM bulk net charge were evident for many PFASs with low to moderate sorption (C5–C8 PFCAs and C6 PFSA). However for the most strongly sorbing and most long-chained PFASs (C9–C11 and C13 PFCAs, C8 PFSA and perfluorooctane sulfonamide (FOSA)), smaller effects of cations were seen, and instead sorption was more strongly related to the pH value. This suggests that the most long-chained PFASs, similar to other hydrophobic organic compounds, are preferentially sorbed to the highly condensed domains of the humin fraction, while shorter-chained PFASs are bound to a larger extent to humic and fulvic acid, where cation effects are significant.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Geochemical modeling, PFOA, PFOS, Soil–water partitioning, Surface net charge, Visual MINTEQ
National Category
Soil Science
Identifiers
urn:nbn:se:kth:diva-228704 (URN)10.1016/j.chemosphere.2018.05.012 (DOI)000436916500022 ()2-s2.0-85047261550 (Scopus ID)
Funder
Swedish Research Council, 2015-03938
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-07-18Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-8771-7941

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