Microscopic analyses of complexes formed in adsorbent for Mo and Zr separation chromatography

高レベル放射性廃液(HALW)の処理に於いて、抽出クロマトグラフィーによる高効率なマイナーアクチノイド(MA)の回収にはモリブデン(Mo)及びジルコニウム(Zr)の事前除去が必要である。そこで、MoとZrの除去と回収を目的としてbis(2-ethylhexyl) hydrogen phosphate (HDEHP)を含浸させた吸着材を用いることを考案し、模擬HALWのカラム分離実験で、MoとZrを選択的に吸着させて除去することに成功した。次に、吸着材からそれらを回収するための溶離液として過酸化水素水を用いたところ、Moのみ溶離された。この吸着材のマイクロPIXE、EXAFS及びX線小角散乱法による分析結果は、結晶状のZr-HDEHP複合体が吸着材中に一様に形成されたことを示していたことから、Moは今回の方法で除去・回収できるが、Zrは結合が強く、過酸化水素水では回収できないことがわかった

Extraction Mechanism of Lanthanide Ions into Silica-based Microparticles Studied by Single Microparticle Manipulation and Microspectroscopy

Single porous silica microparticles coated with a styrene-divinylbenzene polymer (SDB) impregnated with octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) were injected into an aqueous 3 mol/L nitric acid solution containing trivalent lanthanide (Ln(III)), as a high-level liquid waste model. We used the microcapillary manipulation-injection technique; and the extraction rate of Ln(III), as an Ln(III)-CMPO complex, into the single microparticles was measured by luminescence microspectroscopy. The extraction rate significantly depended on the Ln(III), CMPO, or NO3− concentration, and was analyzed in terms of diffusion in the pores of the microparticles and the complex formation of Ln(III). The results indicated that the rate-determining step in Ln(III) extraction was diffusion in the pore solution of the microparticles

Data on two- and three-dimensional optical coherence tomography guidance for the treatment for the bifurcation lesion

This article comprised the data related to the research article entitled “Feasibility and usefulness of three-dimensional optical coherence tomography guidance for optimal side branch treatment in coronary bifurcation stenting” (Nagoshi et al., In press) [1].In this article we reports details about two patterns of guide wire (GW) recrossing position after crossover stenting in bifurcation lesion classified with three-dimensional optical coherence tomography (3D-OCT) (Okamura et al., 2014) [2] and follow-up data about the treatment with percutaneous coronary intervention(PCI) for bifurcation lesion in terms of the two- (2D) or 3D-OCT guidance. Subgroup analysis about differences in the parameters between the proximal and the distal GW recrossing patterns are analyzed here. Keywords: Optical coherence tomography, Bifurcation stenting, Kissing balloon inflation, Three-dimensiona