naa a22 4500 510752136 CHVBK 20180411083108.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11270-013-1564-7 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1564-7 Speciation of Phosphorus and Cadmium in a Contaminated Soil Amended with Bone Char: Sequential Fractionations and XANES Spectroscopy [Elektronische Daten] [Nina Siebers, Jens Kruse, Peter Leinweber] The phosphorus (P) and cadmium (Cd) speciation was analyzed in a contaminated soil having a Cd concentration of 1,028mgkg−1 in order to assess the value of bone char (BC) as a Cd immobilizing agent. The soil was incubated with BC and triple superphosphate (TSP, as control) in the dark at 60 to 70% water holding capacity for time periods between 1 and 145days. Samples from the various incubation periods were sequentially extracted and investigated by X-ray absorption near edge structure (XANES) spectroscopy. The sequential P extraction revealed that BC increased the H2SO4 extractable P fraction, mainly consisting of Ca- and Mg-phosphates, by 14%, whereas TSP increased the water extractable P fraction by 7% of total P at day 1. Subsequently, the proportions of these two P fractions decreased during incubation. The increase in these two P fractions is explained by the solubility of the main components of BC (hydroxylapatite (HAP)) and TSP (Ca(H2PO4)2). Furthermore, this finding was confirmed for BC by the P K-edge XANES spectra using partial least square regression that provided independent evidence for increased proportion of HAP after BC application. As a result of BC dissolution, the soil pH increased resulting in Cd immobilization as indicated by significantly reduced concentrations of mobile Cd in the sequential extraction up to 23mg Cd kg−1. This observed immobilization was explained by the Cd L 3 -edge XANES spectra revealing an immediate increase in the proportion of insoluble Cd3(PO4)2. By contrast, none of the speciation methods indicated a Cd immobilizing capability of TSP. Thus, by using this multi-methodological approach, we could show that besides its potential as renewable and clean P fertilizer, BC is a superior immobilization agent for Cd compared to TSP. Springer Science+Business Media Dordrecht, 2013 P-fertilizer nationallicence Cd immobilization nationallicence X-ray near edge structure spectroscopy nationallicence PLS regression nationallicence Incubation nationallicence Siebers Nina Soil Science, University of Rostock, Justus-von-Liebig Weg 6, 18051, Rostock, Germany aut Kruse Jens Soil Science, University of Rostock, Justus-von-Liebig Weg 6, 18051, Rostock, Germany aut Leinweber Peter Soil Science, University of Rostock, Justus-von-Liebig Weg 6, 18051, Rostock, Germany aut Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-13 0049-6979 224:5<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1564-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1564-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Siebers Nina Soil Science, University of Rostock, Justus-von-Liebig Weg 6, 18051, Rostock, Germany aut NATIONALLICENCE 700 1- Kruse Jens Soil Science, University of Rostock, Justus-von-Liebig Weg 6, 18051, Rostock, Germany aut NATIONALLICENCE 700 1- Leinweber Peter Soil Science, University of Rostock, Justus-von-Liebig Weg 6, 18051, Rostock, Germany aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-13 0049-6979 224:5<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer