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A laboratory scale experiment was set up to test the effect of dissolved organic carbon (DOC) as well as ageing of the La-P complex formed during phosphorus (P) sequestration by a La modified clay (Phoslock (R)). Short term (7 days) P adsorption studies revealed a significant negative effect of added DOC on the P sequestration of Phoslock (R), whereas a long-term P adsorption experiment revealed that the negative effect of added DOC was reduced with time. The reduced P binding efficiency is kinetic, as evident from solid-state P-31 magic-angle spinning (MAS) NMR spectroscopy, who showed that the P binding did not change in the presence of DOC. 31P MAS NMR also reveals that up to 26% of the sequestered phosphate is as loosely bound redox-sensitive P species on the surface of rhabdophane (LaPO4 center dot nH(2)O, n <= 3). The ratio between the loosely bound P and lanthanum phosphate did not change with time, however both NMR and L-III-extended x-ray absorption fine structure (EXAFS) spectroscopy shows a transformation of lanthanum phosphate from the initially formed rhabdophane towards the more stable monazite (LaPO4). Furthermore, the effect of natural DOC on the P binding capacity was tested using water and pore water from 16 Danish lakes. Whilst DOC has an immediate negative impact on P binding in the lake water, with time this effect is reduced. (C) 2015 Elsevier Ltd. All rights reserved.

Nyckelord

Lake restoration; Dissolved organic carbon (DOC); P-31 NMR; Lanthanum; P sequestration; EXAFS

Publicerad i

Water Research
2016, volym: 97, sidor: 39-46
Utgivare: PERGAMON-ELSEVIER SCIENCE LTD

SLU författare

  • Lundberg, Daniel

    • Institutionen för kemi och bioteknologi, Sveriges lantbruksuniversitet

Globala målen (SDG)

SDG6 Rent vatten och sanitet för alla

UKÄ forskningsämne

Annan geovetenskap
Oceanografi, hydrologi, vattenresurser
Miljövetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.watres.2015.07.003

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/80719