{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T22:28:21Z","timestamp":1790980101887,"version":"4.1.0"},"reference-count":38,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2005,3,1]],"date-time":"2005-03-01T00:00:00Z","timestamp":1109635200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"NASA's Graduate Student Researchers Program","award":["NGT 51229"],"award-info":[{"award-number":["NGT 51229"]}]},{"name":"NASA Advanced Life Support Program"}],"content-domain":{"domain":["acsess.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Soil Science Soc of Amer J"],"published-print":{"date-parts":[[2005,3]]},"abstract":"<jats:p>\n                    Micronutrient\u2010substituted synthetic hydroxyapatite (SHA) is being evaluated by the National Aeronautics and Space Administration's (NASA) Advanced Life Support (ALS) Program for crop production on long\u2010duration human missions to the International Space Station or for future Lunar or Martian outposts. The stirred\u2010flow technique was utilized to characterize Ca, P, Fe, Mn, and Cu release characteristics from Fe\u2010, Mn\u2010, and Cu\u2010containing SHA in deionized (DI) water, citric acid, and diethylene\u2010triamine\u2010pentaacetic acid (DTPA). Initially, Ca and P release rates decreased rapidly with time and were controlled by a non\u2010SHA calcium phosphate phase(s) with low Ca\/P solution molar ratios (0.91\u20131.51) relative to solid SHA ratios (1.56\u20131.64). At later times, Ca\/P solution molar ratios (1.47\u20131.79) were near solid SHA ratios and release rates decreased slowly indicating that SHA controlled Ca and P release. Substituted SHA materials had faster dissolution rates relative to unsubstituted SHA. The initial metal release rate order was Mn \u226b Cu &gt; Fe which followed metal\u2010oxide\/phosphate solubility suggesting that poorly crystalline metal\u2010oxides\/phosphates were dominating metal release. Similar metal release rates for all substituted SHA (approximately 0.01 cmol kg\n                    <jats:sup>\u22121<\/jats:sup>\n                    min\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) at the end of the DTPA experiment indicated that SHA dissolution was supplying the metals into solution and that poorly crystalline metal\u2010oxide\/phosphates were not controlling metal release. Results indicate that non\u2010SHA Ca\u2010phosphate phases and poorly crystalline metal\u2010oxide\/phosphates will contribute Ca, P, and metals. After these phases have dissolved, substituted SHA will be the source of Ca, P, and metals for plants.\n                  <\/jats:p>","DOI":"10.2136\/sssaj2005.0362","type":"journal-article","created":{"date-parts":[[2010,7,27]],"date-time":"2010-07-27T19:42:26Z","timestamp":1280259746000},"page":"362-370","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Dissolution Kinetics of Iron\u2010, Manganese\u2010, and Copper\u2010Containing Synthetic Hydroxyapatites"],"prefix":"10.1002","volume":"69","author":[{"given":"B.","family":"Sutter","sequence":"first","affiliation":[{"name":"Dep. of Soil and Crop Sciences Texas A&amp;M Univ. College Station TX 77843"},{"name":"SETI Institute NASA Ames Research Center Moffett Field CA 94035"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L. R.","family":"Hossner","sequence":"additional","affiliation":[{"name":"Dep. of Soil and Crop Sciences Texas A&amp;M Univ. 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