XANES Speciation of P in Environmental Samples: An Assessment of Filter Media for on-Site Wastewater Treatment
2009 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 43, no 17, 6515-6521 p.Article in journal (Refereed) Published
X-ray absorption near edge structure (XANES) spectroscopyis a useful technique for characterization of chemical speciesof phosphorus in complex environmental samples. To developand evaluate bed filters as sustainable on-site wastewater treatment solutions, our objective in this study was to determine the chemical forms of accumulated phosphorus in a selectionof promising filter materials: Filtralite P, Filtra P, Polonite, Absol, blast furnace slag, and wollastonite. Full-scale operational wastewater-treatment systems were sampled and in addition, filter samples collected from laboratory studies provided access to additional media and complementary samples.Phosphorus species were characterized using phosphorus K-edge XANES spectroscopy, complemented by X-ray powder diffraction (XRPD) and attenuated total reflectance Fouriertransform infrared spectroscopy (ATR-FTIR). No systematic differences could be seen in the results between laboratory and full-scale samples. All six filter media contained significant amounts of crystalline calcium phosphates. Some samples also contained amorphous calcium phosphate (>60 % of totalP in Absol). In Filtralite P and blast furnace slag, more than 35 % of the accumulated phosphorus was associated with Fe or Al. Both the power and shortcomings of XANES analysis for characterizing P species in these filter media are discussed.
Place, publisher, year, edition, pages
Washington, DC: American Chemical Society (ACS), 2009. Vol. 43, no 17, 6515-6521 p.
AMORPHOUS CALCIUM-PHOSPHATE, PHOSPHORUS SPECIATION, SPECTROSCOPY; REMOVAL, HYDROXYAPATITE, MECHANISMS, SOILS, SLAG, PRECIPITATION, FILTER MATERIAL
Soil Science Analytical Chemistry Water Engineering Other Environmental Engineering
IdentifiersURN: urn:nbn:se:kth:diva-12045DOI: 10.1021/es901084zISI: 000269258000017ScopusID: 2-s2.0-69549090592OAI: oai:DiVA.org:kth-12045DiVA: diva2:300242
QC 201010052010-02-252010-02-252015-03-24Bibliographically approved