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Maria SchückDoktorand

Om mig

Jag doktorerar inom fytoremediering, vilket är metoder för att använda växter för att rena eller stabilisera förorenad luft, mark eller vatten. Inom mitt projekt arbetar jag med växter som kan användas för att rena dagvatten från tungmetaller och klorid från vägsalt. Dessa växter ska sedan placeras på flottar i dagvattendammar för att förbättra deras reningsförmåga, och därmed minska belastningen av dessa föroreningar på våra sjöar och hav.

De tungmetaller som jag främst fokuserar på är zink, koppar, bly och kadmium. Genom att identifiera de effektivaste växtarterna, deras upptagsmekanismer och hur de påverkas av yttre omständigheter som temperatur och salthalt, skapas förståelse för hur växterna kan användas i praktiska tillämpningar.

Jag har för närvarande fyra pågående delprojekt: 

- Kartläggning av kloridupptag och salttolerans hos våtmarksväxter

- Påverkan av salt och kyla på våtmarksväxters tungmetallsrening

- Påverkan av tidigare exponering på våtmarksväxters tungmetallsrening

- Fältförsök: Metallupptag och tillväxt hos våtmarksväxter i dagvattendammar

 

Forskningen finansieras av Svenska Byggbranschens utvecklingsfond och Svenskt Vatten Utveckling. Jag tillhör Maria Gregers forskningsgrupp Plant Metal tillsammans med Tommy Landberg och Sylvia Lindberg

Undervisning

Jag undervisar i kurserna Växtfysiologi, Växter i miljöns tjänst samt Floristik. 

Publikationer

I urval från Stockholms universitets publikationsdatabas

  • Plant traits related to the heavy metal removal capacities of wetland plants

    2019. Maria Schück, Maria Greger. International journal of phytoremediation 22 (4), 427-435

    Artikel

    Plants are the crucial component of floating treatment wetlands (FTWs). However, heavy metal removal capacity varies between plant species, and the relationships between plant traits and differences in removal capacity remain unclear. This study sought to determine: (1) the relationships between plant traits and removal of Cd, Cu, Pb, and Zn from water, and (2) the relationships between the removal patterns of these metals. Plants of 34 wetland plant species were exposed to heavy metal concentrations common in stormwater for five days, and 20 traits were measured on each plant. Results indicate that the most important plant traits for heavy metal removal from water are transpiration and high total biomass, especially large amounts of fine roots and leaves. The same traits were generally related to removal both initially and after longer exposure, with stronger correlations found after longer exposure. Plant removal of one metal was likely correlated with removal of the other metals, and the plant removal capacity after 30 min of exposure was correlated with the removal capacity five days later. The present results can be used in selecting plants for enhanced heavy metal removal by FTWs and in identifying additional useful plant species, allowing adaptation to local conditions.

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  • Screening the Capacity of 34 Wetland Plant Species to Remove Heavy Metals from Water

    2020. Maria Schück, Maria Greger. International Journal of Environmental Research and Public Health 17 (13)

    Artikel

    Floating treatment wetlands (FTWs), consisting of vegetated rafts, may reduce heavy metal levels in polluted water, but the choice of plant species for efficient metal removal needs to be further investigated. We screened the capacity of 34 wetland plant species to remove metals dissolved in water to identify suitable species for FTWs. The plants were grown hydroponically for 5 days in a solution containing 1.2 µg Cd L−1, 68.5 µg Cu L−1, 78.4 µg Pb L−1, and 559 µg Zn L−1. Results show large variation in metal removal rate and capacity between the investigated species. The species with highest removal capacity could remove up to 52–94% of the metals already after 0.5 h of exposure and up to 98–100% of the metals after 5 days of exposure. Plant size contributed more to high removal capacity than did removal per unit of fine roots. Carex pseudocyperus and C. riparia were the most efficient and versatile species. The findings of this study should be considered as a starting point for further investigation of plant selection for improved water purification by FTWs.

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  • Chloride removal capacity and salinity tolerance in wetland plants

    2022. Maria Schück, Maria Greger. Journal of Environmental Management 308

    Artikel

    Deicing with sodium chloride maintains safe roads in the winter, but results in stormwater runoff with high chloride (Cl) content that causes various downstream problems. Chloride-rich water risks contaminating groundwater, shortening the lifespan of concrete and metal constructions, and being toxic to aquatic organisms. Current stormwater treatment methods are unable to remove Cl, but wetland plants with high chloride uptake capacity have potential to decrease Cl concentrations in water. The aim was to identify suitable plant species for removing Cl from water for future studies on phytodesalination of water, by comparing 34 wetland plant species native to Sweden in a short-term screening. Additionally, Carex pseudocyperus, C. riparia, and Phalaris arundinacea was further compared as to their salinity tolerance and tissue Cl concentration properties. Results show that Cl removal capacity, tissue accumulation, and tolerance varied between the investigated species. Removal capacity correlated with biomass, dry:fresh biomass ratio, water uptake, and transpiration. The three tested species tolerated Cl levels of up to 50–350 mg Cl L−1 and accumulated up to 10 mg Cl g−1 biomass. Carex riparia was the most Cl-tolerant species, able to maintain growth and transpiration at 500 mg Cl L−1 during 4 weeks of exposure and with a medium removal capacity. Due to a large shoot:plant biomass ratio and high transpiration, C. riparia also had high shoot accumulation of Cl, which may facilitate harvesting. Phalaris arundinacea had the highest removal capacity of the investigated species, but displayed decreased growth above 50 mg Cl L−1. From this study we estimate that wetland plants can remove up to 7 kg Cl m−2 from water if grown hydroponically, and conclude that C. riparia and P. arundinacea, which have high tolerance, large biomass, and high accumulation, are suitable candidates for further phytodesalination studies.

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