Inactivated phosphorus by added aluminum in Baltic Sea sediment
2014 (English)In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 151, 181-185 p.Article in journal (Refereed) Published
Decreased phosphorus (P) retention in aquatic sediments during hypoxic periods results in increased P recycling to the water column. To revert to less productive conditions in the enclosed bays of the Baltic Sea archipelago, increased sediment P burial capacity is needed. Aluminum (Al) addition is considered to be a cost-effective lake restoration method, as it improves sediment P burial capacity. However, little is known about its ability to permanently bind P in brackish systems. In summer 2000, Al sulfate granules were added to a hypoxic bottom area in the Osthammar bay, Sweden. Sediment core samples from the area were collected 10 years later. A peak in Al and P was detected at 20 cm sediment depth, reflecting the added Al and P trapped to it. Only part of the added Al was recovered, but the recovered Al (8 g Al/m(2)) trapped P at a ratio of 5:1 (molar). Chemical fractionation showed that P extracted as "Al-P" constituted 55% of the trapped P, indicating that Al added also trapped P extracted as other P forms.
Place, publisher, year, edition, pages
2014. Vol. 151, 181-185 p.
Baltic Sea, eutrophication, sediment, phosphorus, aluminum
Oceanography, Hydrology, Water Resources
IdentifiersURN: urn:nbn:se:uu:diva-245540DOI: 10.1016/j.ecss.2014.10.008ISI: 000347768800019OAI: oai:DiVA.org:uu-245540DiVA: diva2:793896