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Effect of pH, temperature, and oxygenation on arsenic phytofiltration by aquatic moss (Warnstorfia fluitans)
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Mark- och vattenteknik. Department of Ecology, Environment and Plant Sciences, Stockholm University, SE 10691 Stockholm, Sweden.ORCID-id: 0000-0002-2715-2931
Department of Ecology, Environment & Plant Sciences, Stockholm University, SE-10691 Stockholm, Sweden. (Plant Metal Group)
Department of Ecology, Environment & Plant Sciences, Stockholm University, SE-10691 Stockholm, Sweden. (Plant Metal Group)
2018 (engelsk)Inngår i: Journal of Environmental Chemical Engineering, ISSN 2160-6544, E-ISSN 2213-3437, Vol. 6, nr 4, s. 3918-3925Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Phytofiltration of arsenic (As)-contaminated water could reduce As in irrigation and surface water. In a previous study, we found that the aquatic moss Warnstorfia fluitans efficiently removes arsenic from water contaminated with arsenate and arsenite. This work investigates how factors such as pH, temperature, and oxygenation influence As removal, since these factors vary in the environment. Plants were grown in a medium with 5 or 10 μM arsenite or arsenate and: 1) a pH of 2.5, 6.5, or 9.5; 2) a temperature of 12, 20, or 30 °C; and 3) oxygenation of <2 or 13 mg O2 L−1. Removal of As was monitored over 48–96 h, and the content and speciation of As were analysed in moss plants at the termination of the experiments. Results indicate that As removal was faster in arsenite than arsenate solutions. Arsenic removal from arsenite solution was the fastest, i.e., 80–90% within 2 h, at pH 6.5 and 9.5 and at 20 and 30 °C. At pH 2.5, plants were stressed and the net removal was low throughout the treatment period. Arsenic removal was more efficient at low than high oxygenation levels. Besides this, no As net efflux process was seen in the water system except after 48 h in arsenate-treated medium in high-temperature (30 °C) regimes. Regardless of As species added, usually only arsenite was found in the plants after treatment. Most internal As, i.e., 95% in the arsenate and 85% in the arsenite treatments, was firmly bound to the tissue. The study found that at 20 °C, neutral pH, and low oxygenation, this aquatic moss has great potential for As phytofiltration.

sted, utgiver, år, opplag, sider
2018. Vol. 6, nr 4, s. 3918-3925
Emneord [en]
Arsenic removal, Aquatic moss, pH, Phytofiltration, Oxygenation, Temperature, Phytoremediation
HSV kategori
Forskningsprogram
Mark- och vattenteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-204402DOI: 10.1016/j.jece.2018.05.044ISI: 000444046700014Scopus ID: 2-s2.0-85048213199OAI: oai:DiVA.org:kth-204402DiVA, id: diva2:1084247
Forskningsfinansiär
Knut and Alice Wallenberg Foundation
Merknad

QC 20170406

Tilgjengelig fra: 2017-03-24 Laget: 2017-03-24 Sist oppdatert: 2018-09-27bibliografisk kontrollert
Inngår i avhandling
1. ARSENIC REMOVAL BY PHYTOFILTRATION AND SILICON TREATMENT: A POTENTIAL SOLUTION FOR LOWERING ARSENIC CONCENTRATIONS IN FOOD CROPS
Åpne denne publikasjonen i ny fane eller vindu >>ARSENIC REMOVAL BY PHYTOFILTRATION AND SILICON TREATMENT: A POTENTIAL SOLUTION FOR LOWERING ARSENIC CONCENTRATIONS IN FOOD CROPS
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Use of arsenic-rich groundwater for crop irrigation can increase the arsenic (As) content in food crops and act as a carcinogen, compromising human health. Using aquatic plant based phytofiltration is a potential eco-technique for removing arsenic from water. The aquatic moss species Warnstorfia fluitans grows naturally in mining areas in northern Sweden, where high concentrations of arsenic occur in lakes and rivers. This species was selected as a model for field, climate chamber and greenhouse studies on factors governing arsenic removal and arsenic phytofiltration of irrigation water. The arsenic and silicon (Si) concentrations in soil, water and plant samples were measured by AAS (atomic absorption spectrophotometry), while arsenite and arsenate species were determined using AAS combined with high pressure liquid chromatography (HPLC) with an anion exchange column. The arsenic content in grains of hybrid and local aromatic rice (Oryza sativa) cultivars with differing arsenic accumulation factor (AF) values was investigated in an arsenic hotspot in Bangladesh. The results showed that arsenic AF was important in identifying arsenic-safer rice cultivars for growing in an arsenic hotspot. The study based on silicon effect on arsenic uptake in lettuce showed that arsenic accumulation in lettuce (Lactuca sativa) could be reduced by silicon addition. The aquatic moss had good phytofiltration capacity, with fast arsenic removal of up to 82% from a medium with low arsenic concentration (1 µM). Extraction analysis showed that inorganic arsenic species were firmly bound inside moss tissue. Absorption of arsenic was relatively higher than adsorption in the moss. Regarding effects of different abiotic factors, plants were stressed at low pH (pH 2.5) and arsenic removal rate was lower from the medium, while arsenic efflux occurred in arsenate-treated medium at low (12°C) and high (30°C) temperature regimes. Besides these factors, low oxygenation increased the efficiency of arsenic removal from the medium. Finally, combining W. fluitans as a phytofilter with a lettuce crop on a constructed wetland significantly reduced the arsenic content in edible parts (leaves) of lettuce. Thus W. fluitans has great potential for use as an arsenic phytofilter in temperate regions.

sted, utgiver, år, opplag, sider
KTH: KTH Royal Institute of Technology, 2017. s. 49
Serie
TRITA-LWR. PHD, ISSN 1650-8602 ; 2017:02
Emneord
aquatic moss, grain, rice, lettuce, macrophyte, phytoremediation, speciation, temperature, oxygenation, wetland.
HSV kategori
Forskningsprogram
Mark- och vattenteknik
Identifikatorer
urn:nbn:se:kth:diva-203995 (URN)978-91-7729-332-3 (ISBN)
Disputas
2017-04-20, F3, Lindstedtsvägen 26, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20170323

Tilgjengelig fra: 2017-03-23 Laget: 2017-03-22 Sist oppdatert: 2017-03-24bibliografisk kontrollert

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