{"refrec":{"BRefID":100773,"RR":"Diaconu, C.; Brion, N.; Elskens, M.; Baeyens, W.F.J. (2005). Validation of a dynamic ammonium extraction technique for the determination of 15N at enriched abundances. Anal. Chim. Acta 554(1-2): 113-122","BEntID":95961,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". Anal. Chim. Acta 554(1-2): 113-122","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Diaconu, C.; Brion, N.; Elskens, M.; Baeyens, W.F.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Diaconu, C. et al.","Englishabstract":"A diffusion method for extracting ammonium from marine, estuarine and fresh waters for 15N/14N isotopic ratio determinations at enriched level was developed and validated. The method is based on the conversion of NH4+ to NH3 gas under alkaline conditions, diffusion of NH3 out of the solution to the headspace, NH3 trapping on an acidified GF/D glass fiber filter, and subsequent 15N/14N isotope ratio determination with mass spectrometry. The diffusion period necessary to extract sufficient N in order to accurately measure the atom% 15N was reduced to less than 15 h by bubbling the sample with a carrier gas (Air) at room temperature. The technique uses 250 mL sample volume and enables accurate atom% 15N measurements in NH4+ pools as small as 1.25 μM. A standard operating procedure for ammonium extraction is given involving method performance criteria, such as accuracy, precision, detection limit, quantification limit and robustness. The efficiency of the NH4+ extraction ranged from 40 to 100%. The quantification limit of the method was estimated at around 0.26 μmol% N, for an initial 15N abundance of \"not,1%. The within-laboratory reproducibility amounted to 0.03 atom% 15N. It was shown that the recovery rate obtained after extraction of the certified reference material (CRM: IAEA-311) solution falls within the 95% confidence interval of the certified values. By applying the developed method to fortified natural water samples of different conductivities, the atom% 15N determinations were precise and accurate for α = 1–5%.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Validation of a dynamic ammonium extraction technique for the determination of 15N at enriched abundances","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2005,"MonPub":null,"DateUpdate":"2006-07-14","DateCreate":"2006-07-14","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":100773,"PubliDate":2005,"Pagination":"113-122","XtraPublOfAnaID":null,"ISBN":null,"Volume":"554","Issue":"1-2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42099,"SerRR":"Analytica Chimica Acta. 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