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Titolo:
Determination of Np-237 in marine sediment and seawater
Autore:
Chen, QJ; Dahlgaard, H; Nielsen, SP; Aarkrog, A; Christensen, I; Jensen, A;
Indirizzi:
Riso Natl Lab, Nucl Safety Res & Facil Dept, DK-4000 Roskilde, Denmark Riso Natl Lab Roskilde Denmark DK-4000 l Dept, DK-4000 Roskilde, Denmark
Titolo Testata:
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
fascicolo: 3, volume: 249, anno: 2001,
pagine: 527 - 533
SICI:
0236-5731(200109)249:3<527:DONIMS>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Chen, QJ Riso Natl Lab, Nucl Safety Res & Facil Dept, DK-4000 Roskilde, Denmark Riso Natl Lab Roskilde Denmark DK-4000 K-4000 Roskilde, Denmark
Citazione:
Q.J. Chen et al., "Determination of Np-237 in marine sediment and seawater", J RAD NUCL, 249(3), 2001, pp. 527-533

Abstract

Procedures for determination of neptunium in marine sediment and seawater samples are described. Iron hydroxide Fe(OH)(2)-Fe(OH)(3) is used for preliminary pre-concentration of neptunium. Secondly, neptunium Np4+ and Pu3+ are separated by tri-isooctylamine-(TIOA) extraction in 8-10M HCl by redox with SO32--Fe3+. Neptunium Np4+ and uranium U6+ are separated by back extraction the Np4+ with 2M HCl. Finally, the neptunium is purified from the uranium and thorium by anion exchange in 8M HNO3 and 12M HCl. The stripping of 6M HCl + NH2OH . HCl further separates the neptunium Np3+ and uranium. Reduction by SO32--Fe3+ appeared to be an efficient way to obtain Np4+. The decontamination factors of the procedure are 4.0 . 10(4) for Th-232. 5.6 . 10(4) for uranium and 1.6 . 10(4) for plutonium.

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Documento generato il 04/12/20 alle ore 18:55:20