TY - JOUR A1 - Simon, Franz-Georg A1 - Biermann, Vera A1 - Peplinski, Burkhard T1 - Uranium removal from groundwater using hydroxyapatite T2 - Applied geochemistry N2 - The present work shows that U can be effectively removed from groundwater using permeable reactive barriers with hydroxyapatite (HAP) as reactive material. The main factor influencing the removal processes is the composition of the groundwater, namely the concentration of Ca and carbonate. Sorption of U onto the HAP surface seems to be the dominant removal process with the possibility of remobilisation. Newly formed U-phosphate minerals were detected by ESEM/EDX and XRD in samples with high U content indicating either a dissolution-precipitation mechanism or sorption onto the apatite surface followed by alteration of the structure. The formed U-phosphate minerals are stable under common groundwater conditions and can be remobilised only at high pH-values and high carbonate concentrations. PB - Elsevier Science CY - Amsterdam KW - Uranium KW - Hydroxyapatite KW - Groundwater remediation KW - XRD PY - 2008 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/17798 AN - OPUS4-17798 SN - 0883-2927 SN - 1872-9134 VL - 23 IS - 8 SP - 2137 EP - 2145 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany