{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,11]],"date-time":"2026-11-11T15:09:37Z","timestamp":1794409777021,"version":"4.9.0"},"reference-count":0,"publisher":"Oxford University Press (OUP)","issue":"3","license":[{"start":{"date-parts":[[2014,5,1]],"date-time":"2014-05-01T00:00:00Z","timestamp":1398902400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2014,5,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>A two-part single-laboratory validation study was conducted for determination of the P and K content in commercial fertilizer materials by inductively coupled plasma-optical emission spectrometry (ICP- OES). While several methods exist for determination of P and K in fertilizer products, the main focus of this study was on ICP-OES determination, which offers several unique advantages. Fertilizer samples with consensus P and K values from the Magruder and Association of Fertilizer and Phosphate Chemists (AFPC) check sample programs were selected for this study. Validation materials ranging from 4.4 to 52.4% P2O5 (1.7 to 22.7% P) and 3 to 62% K2O (2.5 to 51.5% K) were utilized. Because all P and K compounds contained in fertilizer materials are not \"available\" for plants to use, this study was conducted in two parts. Part A focused on ammonium citrate\u2013disodium EDTA as the extraction solvent, as it estimates the pool of fertilizer P and K that is considered available to plants. Part B focused on hydrochloric acid as the digestion solvent, as it estimates the total P and K content of the fertilizer product. Selectivity studies indicated that this method can have a high bias for fertilizer products containing sources of phosphite or organic P compared to gravimetric or colorimetric methods that measure just orthophosphate. Provided the analytical challenges outlined in this study are addressed, this method offers the potential for a quick, accurate, and safe alternative for determining the P and K content of commercial inorganic fertilizer materials.<\/jats:p>","DOI":"10.5740\/jaoacint.12-399","type":"journal-article","created":{"date-parts":[[2014,6,12]],"date-time":"2014-06-12T18:55:59Z","timestamp":1402599359000},"page":"687-699","source":"Crossref","is-referenced-by-count":21,"title":["Determination of Phosphorus and Potassium in Commercial Inorganic Fertilizers by Inductively Coupled Plasma-Optical Emission Spectrometry: Single-Laboratory Validation"],"prefix":"10.1093","volume":"97","author":[{"given":"James M","family":"Bartos","sequence":"first","affiliation":[{"name":"Office of Indiana State Chemist, 175 South University St, West Lafayette, IN 47907, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barton L","family":"Boggs","sequence":"additional","affiliation":[{"name":"CF Industries, 10608 Paul Buchman Hwy, Plant City, FL 33565"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J Harold","family":"Falls","sequence":"additional","affiliation":[{"name":"CF Industries, 10608 Paul Buchman Hwy, Plant City, FL 33565"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sanford A","family":"Siegel","sequence":"additional","affiliation":[{"name":"CF Industries, 10608 Paul Buchman Hwy, Plant City, FL 33565"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2019,11,27]]},"container-title":["Journal of AOAC INTERNATIONAL"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/academic.oup.com\/jaoac\/article-pdf\/97\/3\/687\/32425386\/jaoac0687.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"http:\/\/academic.oup.com\/jaoac\/article-pdf\/97\/3\/687\/32425386\/jaoac0687.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2020,3,19]],"date-time":"2020-03-19T14:12:19Z","timestamp":1584627139000},"score":1,"resource":{"primary":{"URL":"https:\/\/academic.oup.com\/jaoac\/article\/97\/3\/687-699\/5654747"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2014,5,1]]},"references-count":0,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2019,11,27]]},"published-print":{"date-parts":[[2014,5,1]]}},"URL":"https:\/\/doi.org\/10.5740\/jaoacint.12-399","relation":{},"ISSN":["1060-3271","1944-7922"],"issn-type":[{"value":"1060-3271","type":"print"},{"value":"1944-7922","type":"electronic"}],"subject":[],"published-other":{"date-parts":[[2014,5,1]]},"published":{"date-parts":[[2014,5,1]]}}}