{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T15:09:13Z","timestamp":1791126553197,"version":"4.1.0"},"reference-count":40,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2007,11,1]],"date-time":"2007-11-01T00:00:00Z","timestamp":1193875200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000199","name":"U.S. Department of Agriculture","doi-asserted-by":"publisher","award":["WIS04655"],"award-info":[{"award-number":["WIS04655"]}],"id":[{"id":"10.13039\/100000199","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["DMR\u20100537588"],"award-info":[{"award-number":["DMR\u20100537588"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["acsess.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J of Env Quality"],"published-print":{"date-parts":[[2007,11]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Intensive manure application is an important source of diffuse phosphorus (P) pollution. Phosphorus availability from animal manure is influenced by its chemical speciation. The major objective of this study was to investigate the P speciation in raw and anaerobically digested dairy manure with an emphasis on the calcium (Ca) and magnesium (Mg) phosphate phases. Influent and effluent from an on\u2010farm digester in Wisconsin were sampled and sieved, and the 25 to 53 \u03bcm size fraction was dried for X\u2010ray powder diffraction (XRD) and P K\u2010edge X\u2010ray absorption near edge structure (XANES) analyses. Struvite (MgNH\n                    <jats:sub>4<\/jats:sub>\n                    PO\n                    <jats:sub>4<\/jats:sub>\n                    \u00b76H\n                    <jats:sub>2<\/jats:sub>\n                    O) was identified in both the raw (influent) and anaerobically digested (effluent) manure using XRD. Qualitative analysis of P K\u2010edge XANES spectra indicated that the Ca orthophosphate phases, except dicalcium phosphate anhydrous (DCPA) or monetite (CaHPO\n                    <jats:sub>4<\/jats:sub>\n                    ), were not abundant in dairy manure. Linear combination fitting (LCF) of the P standard compounds showed that 57.0 and 43.0% of P was associated with DCPA and struvite, respectively, in the raw manure. In the anaerobically digested sample, 78.2% of P was present as struvite and 21.8% of P was associated with hydroxylapatite (HAp). The P speciation shifted toward Mg orthophosphates and least soluble Ca orthophosphates following anaerobic digestion. Similarity between the aqueous orthophosphate (aq\u2010PO\n                    <jats:sub>4<\/jats:sub>\n                    ), newberyite (MgHPO\n                    <jats:sub>4<\/jats:sub>\n                    \u00b73H\n                    <jats:sub>2<\/jats:sub>\n                    O), and struvite spectra can cause inaccurate P speciation determination when dairy manure is analyzed solely using P K\u2010edge XANES spectroscopy; however, XANES can be used in conjunction with XRD to quantify the distribution of inorganic P species in animal manure.\n                  <\/jats:p>","DOI":"10.2134\/jeq2006.0563","type":"journal-article","created":{"date-parts":[[2007,10,26]],"date-time":"2007-10-26T19:56:58Z","timestamp":1193428618000},"page":"1856-1863","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":91,"title":["Determination of Phosphorus Speciation in Dairy Manure using XRD and XANES Spectroscopy"],"prefix":"10.1002","volume":"36","author":[{"given":"Kerem","family":"G\u00fcng\u00f6r","sequence":"first","affiliation":[{"name":"Biological Systems Engineering Dep. Univ. of Wisconsin\u2010Madison 460 Henry Mall Madison WI 53706"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Astrid","family":"J\u00fcrgensen","sequence":"additional","affiliation":[{"name":"Canadian Synchrotron Radiation Facility Synchrotron Radiation Center 3731 Schneider Dr. Stoughton WI 53589\u20103097"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K. G.","family":"Karthikeyan","sequence":"additional","affiliation":[{"name":"Biological Systems Engineering Dep. Univ. of Wisconsin\u2010Madison 460 Henry Mall Madison WI 53706"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2007,11]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.2134\/jeq2004.1062"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.2134\/jeq2003.1809"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.2175\/106143004X141645"},{"key":"e_1_2_7_5_1","first-page":"333","article-title":"Chemical\u2010composition of animal manure\u2010A modeling approach","volume":"38","author":"Bril J.","year":"1990","journal-title":"Neth. J. Agric. 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