Determination of neptunium in environmental samples by extraction chromatography after valence adjustment

Plasma source mass spectrometry for radioactive waste characterisation in support of nuclear decommissioning: a review

“…82,[267][268][269][270][271][272][273][274][275][276][277] Neptunium occurs in both tetra-and pentavalent states, and the variation in oxidation state depending on the reagents and conditions used makes sample preparation challenging. 278 Bulk separation from the sample matrix has been achieved by techniques including iron hydroxide precipitation 272 and lanthanum hydroxide precipitation, 275 followed by ion exchange or extraction chromatography. 82,[268][269][270][271][272]275,278 Neptunium is oen measured along with Pu following chemical separation, given the similar chemical behavior of the two elements in HNO 3 and HCl on anion exchange and extraction chromatography resins.…”

“…278 Bulk separation from the sample matrix has been achieved by techniques including iron hydroxide precipitation 272 and lanthanum hydroxide precipitation, 275 followed by ion exchange or extraction chromatography. 82,[268][269][270][271][272]275,278 Neptunium is oen measured along with Pu following chemical separation, given the similar chemical behavior of the two elements in HNO 3 and HCl on anion exchange and extraction chromatography resins. 63,[268][269][270][271][274][275][276]279 A micro-ow injection sample introduction system combined with membrane desolvation improved the instrument sensitivity, and the detection limit by concentrating the analyte into a smaller volume.…”

Multi-dimensional extraction chromatography of actinides for alpha and mass spectrometry

“…The fusion protocol developed previously for the M4 Fluxer was used. 33 The fused samples were automatically poured in a TeflonÒ beaker containing 50 mL of 2 M HCl which effectively dissolve lithium metaborate in approximately 10 minutes of stirring. The solution was then allowed to cool down for 1 hour to room temperature.…”

Determination of distribution coefficients (Kd) of various radionuclides on UTEVA resin

“…The distribution coefficient (K d ) is a key parameter in making separations that show the retention property of an element on a resin within a specific media (HCl, H 2 SO 4 , HNO 3 , etc.). So far, distribution coefficients found in the literature has been mainly concerned with actinides and very few other elements [1,5,[7][8][9][10][11][12][13][14]. The retention factors of the actinides Th, U, Np in HNO 3 and HCl on UTEVA resin have been published ( Figure 2) [15,16].…”