Journal of Radioanalytical and Nuclear Chemistry

Hành vi hấp phụ của gel silica đối với zirconium, niobium, ruthenium và cerium trong axit hydrochloric đã được nghiên cứu bằng cả phương pháp batch và cột. Một phân tách đồng vị phóng xạ thỏa mãn giữa zirconium và niobium, cũng như giữa chúng với các sản phẩm phân rã khác đã được thực hiện bằng kỹ thuật hai cột. Quy trình được khuyến nghị bao gồm việc hấp phụ tất cả các nuclide trên một cột gel silica chính. Mười lăm phần trăm 95Nb, tất cả zirconium và tất cả các sản phẩm phân rã khác lần lượt được rửa trôi đầu tiên bằng 5,5 M HCl. Một lần elution thứ hai với axit hydrochloric đậm đặc sẽ thu hồi 95Nb (không có các sản phẩm khác). Dung dịch từ lần elution đầu tiên sau khi bay hơi còn 1 ml sẽ được chuyển qua một cột gel silica khác và được rửa liên tiếp với 0,5 M HCl, 5,5 M HCl và axit HCl đậm đặc để thu được ba phân đoạn—các sản phẩm phân rã khác—95Zr không có sản phẩm khác—95Nb không có sản phẩm khác, tương ứng.

Instrumental neutron activation analysis (INAA) was used to determine trace elemental contamination in bird feathers. Primary feathers from twelve mallard (Anas platyrhynchos) ducks, migrating through the Thousand Islands region of Ontario, Canada, were analyzed for selenium, mercury, chromium, arsenic and antimony. Certified reference materials were used to assess the quality of the analytical procedure. Quantification of chemical elements was performed using Ortec Gamma Vision software. Five chemical elements were quantified, with corresponding analytical uncertainties of less than 20%. Results indicated the presence of As (max = 0.13 mg kg−1), Cr (max = 2.6 mg kg−1), Hg (max = 7.7 mg kg−1), Sb (max = 0.31 mg kg−1) and Se (max = 1.31 mg kg−1). To assess the validity of using INAA as a quantitative analytical technique for feather samples, two standard reference materials were examined and mercury results were compared to those obtained from both direct mercury analysis (DMA) and cold vapour atomic absorption spectroscopy (CVAAS). Several CVAAS results differed significantly from the INAA results; in many instances CVAAS appeared to under-report when compared to INAA, with relative percent difference values as high as 126%. Conversely, results obtained using DMA compared favourably with INAA. For all samples, RPD values were within 30%. This is the first study to use INAA to examine feather contamination in Canadian migratory waterfowl and the first to corroborate INAA feather results by comparing them to those obtained using CVAAS and DMA.

The physical processes of ion implantation are discussed. The chemical bonds between implanted and host atoms depend on the location of the implanted atom in the lattice. The experimental methods used for the investigation of the bonding structure are shortly revlewed. The Mössbauer spectroscopy had proved a powerful method for determining the bonding structures of the implanted atoms. The discussion is limited to57Fe implanted atoms in various hosts and the systematics of the isomer shift is discussed. The analysis showed that the bonding between these atoms results in electron transfer of the bonding s and d electrons. The “anomalous” Mössbauer spectra measured in Bi and Pb lattices are discussed.

In this article we studied the dynamic dissociation constant (k d) of 99Mo complexed with insulin molecule at various pH. The k d values were determined by dialysis technique against deionised water. The T 1/2 of the molybdenum–insulin complexes were found to be 6.41, 5.25 and 3.5 h at pH 5, 6 and 7 respectively. The half-lives indicate that insulin may act as good carrier of 99Mo to the intestine and may be useful in the field of nuclear medicine.

The deposition of125I in three commercial preparations using polyacrylamide slab gel electrophoresis is studied.

To provide a convenient and facile method to evaluate the radiochemical purity (RCP) of 99mTc-TRODAT-1 in quality control of routine clinical application, a simplified method of single-strip thin layer chromatography (TLC) was developed and validated by high performance liquid chromatography (HPLC). The RCP data of TLC correlated well with HPLC.

The material of magnetic amorphous titanium phosphate (MATP-x-T, where x was the dosage of Fe3O4, T was synthesis temperature) was successfully synthesized and confirmed by various experimental characterization methods (FT-IR, XRD, SEM, and Zeta potential), and its adsorption property for U(VI) removal was evaluated. The adsorption of U(VI) on MATP-x-T were explored through batch experiments. The optimal value of x and T was 0.5 g and 70 °C, respectively. The saturated adsorption capacity of MATP-0.5-70 was 401.5 mg g−1 for U(VI) at 298.15 K. The U(VI) adsorption was well explained by the pseudo-second order kinetic model. The possible mechanism of the adsorption of U(VI) was explored based on XPS and FTIR analysis. MATP-0.5-70 could be employed as an auspicious candidate for U(VI) removal radioactive wastewater.

Iron carbide nanoparticles were produced by ultrasonication of ferrocene in diphenylmethane and their properties were investigated using Mössbauer spectroscopy, Transmission electron microscopy and X-ray diffraction. The as-prepared particles were amorphous paramagnetic iron carbides, and the particles obtained after annealing exhibited magnetic components. The particles obtained after annealing at 873 K under argon flow for 2 h consisted of Fe3C, α-Fe, and paramagnetic iron carbide, while Mössbauer spectra indicated that no iron oxides were present.