Journal
MARINE CHEMISTRY
Volume 168, Issue -, Pages 1-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.marchem.2014.10.009
Keywords
Phosphorus speciation; Marine sediments; Sequential extraction; SEDEX; X-ray absorption spectroscopy
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Funding
- Netherlands Organisation for Scientific Research [86405.004, 822.01013]
- European Research Council under the European Community's Seventh Framework Programme for ERC Starting Grant [278364]
- Earth and Life Sciences (ALW) division of the Netherlands Organisation for Scientific Research (NWO)NWO
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
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The bulk phosphorus (P) distribution in sediment samples from the oxygen minimum zone of the northern Arabian Sea was determined using two methods: sequential chemical extraction (the 'SEDEX' procedure) and X-ray absorption near-edge structure (XANES) spectroscopy of the phosphorus K-edge. Our results show good agreement between iron (Fe-)associated P and calcium phosphate minerals (Ca-P) determined by both methods. Furthermore, we find that SEDEX exchangeable P likely represents loosely Fe-bound P, and that the SEDEX detrital fraction may consist partly of polyphosphate, i.e. microbially synthesized intracellular phosphate. Below productive waters with relatively high sedimentary organic matter and P contents, polyphosphates may represent an important P sink that is not easily identified by chemical sequential extraction. This study highlights the value of SEDEX as a generally accurate and fast P speciation technique (especially for Fe- and Ca-P) and, for the first time, demonstrates the possibilities of P K-edge XANES as a bulk P speciation tool for marine sediments. (C) 2014 Elsevier B.V. All rights reserved.
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