Y. N. Niu

Identification of 186mTa

186m Ta and 186 Ta have been produced by irradiation of nat W with 14 MeV neutrons. The unreported tantalum isomer 186m Ta has been identified by means of measuring known γ rays from 186 Ta β-decay...

Solvent Extraction Study of 233Pa(V) with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone

Various techniques have been developed for extraction and separation of protactinium (Pa), of which solvent extraction is considered to be the simplest method and also rapid, selective and efficient.(1,2)) The extraction pattern of Pa is relevant with respect to the chemistry of dubnium (Db), as Db resembles its pseudo homologue protactinium rather than its closest homologue tantalum (Ta). Kratz et al, (3)) Paulus et al.(4)) and Zimmermann et al.(5)) studied the extraction behavior of Pa-233 and its other homologues with triisooctyl amine (TIOA), tri-n-octyl amine (TOA) and aliquat 336, a quaternary ammonium salt. The TIOA-HCl-HF and Aliquat 336-HCl-HF systems were found to be suitable for extraction pattern studies of Db as well as its homologue and pseudo-homologue, Nb and Pa, respectively. Therefore, studying the extraction pattern of Pa with different types of extracting agents is important to identify similarities with the extraction pattern of Db and thereby unravel some of the chemistry of Db. Recently, 1-phenyl-3-methyl-4-benzoyl-5-pyrazoloiie (PMBP) has drawn attention from analytical chemists for its capability to extract heavy metals.(6,7)) The PMBP-mineral acid system does not form a third phase in contrast to high molecular weight-mineral acid systems(8,9)) and the separation time between organic and aqueous phases is almost instantaneous. Keeping in mind the above facts, we report the solvent extraction behavior of Pa with PMBP diluted in xylene or chloroform from HCl, HCl-HF, HNO3 and H2SO4 media.