A new method has been developed for the separation and determination of low-level activity of strontium-90 through its daughter product yttrium-90 from natural water. Yttrium was separated and isolated from 1001 water at pH 5.5–5.7 by 8-quinolinol substituted silica gel. The yttrium was eluted with hydrochloric acid and precipitated with ammonium oxalate. The precipitate of yttrium oxalate was counted with a low-background beta-counter. The recovery of yttrium-90 is (64±4)% (n=5).
Authors:L. Qiang-Guo, H. Yi, L. Xu, Y. Li-Juan, X. Sheng-Xiong, Y. De-Jun, and L. Yi
The complex from reaction of neodymium chloride six-hydrate with salicylic acid and 8-hydroxyquinoline, Nd(C7H5O3)2·(C9H6NO), was synthesized and characterized by IR, elemental analysis, molar conductance, and thermogravimatric analysis. The standard
molar enthalpies of solution of [NdCl3·6H2O(s)], [2C7H6O3(s)], [C9H7NO(s)] and [Nd(C7H5O3)2·(C9H6NO)(s)] in a mixed solvent of anhydrous ethanol, dimethyl formamide (DMF) and perchloric acid were determined by calorimetry at
298.15 K. Based on Hess’ law, a new chemical cycle was designed, and the enthalpy change of the reaction
was determined to be ΔrHmΘ=117.89±0.37 kJ mol−1. From data in the literature, through Hess’ law, the standard molar enthalpy of formation of Nd(C7H5O3)2·(C9H7NO)(s) was estimated to be ΔfHmΘ[Nd(C7H5O3)2·(C9H6NO)(s), 298.15 K]=−2031.80±8.6 kJ mol−1.
Authors:V. Tertykh, V. Yanishpolskii, and O. Panova
The reaction conditions and component ratios were established for the attachment of 4-(2-pyridylazo)resorcinol (PAR), 1-(2-pyridylazo)-2-naphthol
(PAN) and 8-hydroxyquinoline (8-HQ) to the silica surface by means of a single-stage Mannich reaction. The modified sorbents
that were synthesized were characterized by an adsorption method, and DRIFT and UV spectroscopies. The concentrations of PAR,
PAN and 8-HQ grafted to the silica surface that were attained were 2.810−5, 8.510−5 and 2.710−4 mol g−1, respectively.
Authors:Preeti Gupta, Tanvi Agrawal, S. S. Das, and N. B. Singh
eutectic melts in the absence of a solvent.
In this paper reactions of 4-nitrophenol (4-NP), 2,4-dinitrophenol (2,4-DNP) and 2,4,6-trinitrophenol (2,4,6-TNP) were carried out separately in 8-hydroxyquinoline (8-HQ)–benzoic acid (BA) eutectic melt
Authors:C. Ribeiro, M. Crespi, L. Guinesi, C. Guerreiro, and H. Zorel
Tin(II) complexes with 8-hydroxyquinolinate in solid state have been obtained by adding aqueous ammonium to a solution containing
stannous chloride and 8-hydroxiquinoline in medium of HCl and acetone up to pH 5 and 9, respectively. The products obtained
show the same composition, Sn(C9H6ON)2; however there are some differences regarding both the thermal behaviour in an oxidant atmosphere and morphology. These products
were characterised by elemental and complexometric analysis, TG and DTA curves, infrared and X-ray diffractometry. TG curves
show, above 448 K, the partial oxidation on air atmosphere of Sn(II) complexes to Sn(IV) complexes, SnO(C9H6ON)2. This behaviour does not depend only on pH in which the compounds were obtained but also on the heating rate in TG curves.
Sn(II) complexes volatilise almost completely on nitrogen atmosphere and partially on air atmosphere depending on the oxidation
degree of the compound.
Radionuclide X-ray fluorescence analysis was used for the determination of Cr, Fe, Cu, Zn and Pb in industrial wastewaters (from surface treatment of metals and glasses) after precipitation of determined elements by 8-hydroxyquinoline.
Authors:K. Shikano, K. Masumoto, T. Ohtsuki, and M. Katoh
We studied the production of nine typical organic analytical reagents labeled with11C,13N and18F by irradiation with charged particles and bremsstrahlung and the purification of labeled compounds with HPLC and sublimation.
As a result, we found that six reagents, α-naphthol, β-naphthol, quinoline, α-nitroso-β-naphthol, 8-hydroxyquinoline, and
1,10-phenanthroline H2O could be labeled with11C by bombarding a mixture of each reagent and boron with protons. More than 10% of the11C was successfully exchanged with carbon atoms in the original reagents. We also found that sublimation is useful for purifying
8-hydroxyquinoline labeled with11C. The extraction property of11C-labeled 8-hydroxyquinoline between water and chloroform could be easily monitored by radioactivity measurement.