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The resolution for the three homologues of alpha-hydroxycarboxylic acids viz. lactic acid, alpha-hydroxyisobutyric acid (alpha-HIBA) and alpha-hydroxy-alpha-methylbutyric acid (alpha-H-alpha-MBA), was compared for the individual separation of 14 lanthanide elements under identical experimental conditions. Alpha-HIBA was found to be the best for separation of heavier lanthanides (Tb to Lu) while alpha-H-alpha-MBA led to a better separation for lighter lanthanides (La to Eu). All the 14 lanthanides were separated by gradient HPLC employing both alpha-HIBA and alpha-H-alpha-MBA so that there was reasonable resolution among all the peaks and the separation was completed in a short time. 相似文献
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P.G. Jaison Vijay M. Telmore Pranaw KumarSuresh K. Aggarwal 《Journal of chromatography. A》2009,1216(9):1383-1389
Studies were carried out for the separation of uranium (U) and thorium (Th) on reversed-phase (RP) C18 columns using mandelic acid as an eluent. Retention of thorium–mandelate on the unmodified stationary phase was found to be greater than that of uranyl–mandelate under the pH conditions employed. Th retention capacity of the stationary phase was determined as a function of pH and MeOH content of the mobile phase. The optimised parameters allowing U elution prior to Th were utilized for the determination of small amounts of U in the presence of large amounts of Th. The method has been used for the determination of U in synthetic samples with Th/U amount ratios up to 100,000 (10 μg/g of U) without any pre-separation, employing a particulate C18 column. Effect of concentration of ion interaction reagents (IIRs) on the retention was studied to understand the mechanism of adsorption of their mandelate complexes onto the stationary phase. The experiments conducted unequivocally prove that thorium–mandelate complex is neutral whereas uranyl–mandelate complex is anionic in nature. 相似文献
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Vijay M. Telmore Pranaw Kumar P. G. Jaison A. Mhatre H. Naik 《Journal of Radioanalytical and Nuclear Chemistry》2017,313(2):319-326
The activities of 228,229Th and 232,233U from an irradiated ThO2 sample were radiochemicaly separated by using high performance liquid chromatography. Plancheted sources of the separated samples were made and the amount of 232,233U and 228,229Th were estimated by using alpha and gamma-ray spectrometric techniques. These estimations are important for the Th–U fuel reprocessing cycle of advanced heavy water reactor and accelerator driven sub-critical system. 相似文献
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Wagh S. S. Patra A. K. Joshi C. P. John Jaison T. Jha M. K. Nankar D. P. Jain Abhishek Jain Shilpa Saradhi I. V. Kumar A. Vinod 《Journal of Radioanalytical and Nuclear Chemistry》2021,330(3):891-899
Journal of Radioanalytical and Nuclear Chemistry - The activity of 137Cs was measured in different terrestrial samples around Kakrapar Gujarat site. Transfer Factor and Ecological half-life of... 相似文献
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T. J. Jaison A. K. Patra M. K. Jha A. G. Hegde 《Journal of Radioanalytical and Nuclear Chemistry》2010,284(3):583-589
The naturally occurring radioisotopes such as 238U, 232Th and 40K in the silt samples collected from Moticher lake, Gujarat were evaluated. The activity of 238U, 232Th and 40K was found to be 4.4-9.7 Bq kg−1 with a mean 6.4 ± 1.3 Bq kg−1, 10.5–21.2 Bq kg−1 with a mean 15.6 ± 2.5 Bq kg−1 and 102–231 Bq kg−1 with a mean 160 ± 40 Bq kg−1, respectively. The depth profile study could not reveal any significant vertical correlation on radioactivity levels of 238U, 232Th and 40K. Radium equivalent activity (Raeq), external hazard index (H
ex) and internal hazard index (H
int) were calculated by using the activity of 238U or 226Ra, 232Th and 40K in silt samples. Annual Effective Dose Equivalent (AEDE) level in Moticher silt was found to be 24.8 ± 5.0 μSv year−1, which is much lower than the worldwide average value. The relative contribution to dose due to 238U and 232Th series were found to be 14% and 53%, followed by the contribution of 33% due to 40K. 相似文献