TY - JOUR A1 - Krüger, Oliver A1 - Adam, Christian T1 - Phosphorus in recycling fertilizers - analytical challenges T2 - Environmental Research N2 - The importance of secondary raw materials for phosphorus (P) fertilizer production is expected to increase in the future due to resource depletion, supply risks, and heavy metal contamination of fossil phosphate resources. Municipal wastewater is a promising source for P recovery. In Germany for instance, it contains almost 50% of the total amount of P that is currently applied as mineral fertilizer. Several procedures have been developed to recover and re-use P resulting in a growing number of recycling fertilizers that are currently not regulated in terms of fertilizer efficiency. We tested various materials and matrices for their total P content, solubility of P in neutral ammonium citrate (Pnac) and water, and performed robustness tests to check if existing analytical methods are suitable for those new materials. Digestion with inverse aqua regia was best suited to determine the total P content. Pnac sample preparation and analyses were feasible for all matrices. However, we found significant time and temperature dependencies, especially for materials containing organic matter. Furthermore, several materials didn’t reach equilibrium during the extractions. Thus, strict compliance of the test conditions is strongly recommended to achieve comparable results. PB - Elsevier CY - Rotterdam KW - Recycling fertilizer PY - 2017 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/39430 AN - OPUS4-39430 SN - 0013-9351 SN - 1096-0953 VL - 155 SP - 353 EP - 358 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany