B. D. Joshi
Bhabha Atomic Research Centre
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Featured researches published by B. D. Joshi.
Journal of Luminescence | 1973
B. D. Joshi; B.M. Patel; A.G. Page; T.R. Bangia; R.N. Saxena
Abstract The absorption and fluorescence spectra of 5 % Tb 3+ ions in lanthanum bromide anhydrous crystal have been studied at 77 °K. The fluorescence groups in the regions 3800–4820 A and 4880–6780 A have been interpreted as arising from transitions from 5 D 3 and 5 D 4 respectively to the Stark components of 7 F levels. Twenty-seven out of thirty-three components of 7 F levels, five out of six components of 5 D 3 have been obtained from the analysis.
Spectrochimica Acta Part B: Atomic Spectroscopy | 1984
A. G. Page; S. V. Godbole; K. H. Madraswala; Madhuri J. Kulkarni; Vanita S. Mallapurkar; B. D. Joshi
Abstract Feasibility studies have been carried out on the use of a graphite electrode assembly for the introduction of U3O8 solid samples into a continuously running low-powered argon inductively coupled plasma for the assay of trace metallic elements in uranium. The d.c. arc carrier distillation procedure has been adopted here for the selective volatilisation of analyte elements from the refractory matrix by injecting analyte vapours into the central zone of the plasma using Scribner-Mullin electrodes covered with a graphite lid having a central opening. The experimental parameters have been optimised for the direct determination of B, Be, Cd, Co, Cr, Cu, Fe, K, Li, Mn, Na, Ni and Pb in U3O8 powders. The analytical performance of the method has been checked by analysing spiked U3O8 samples and is seen to be comparable to or better than d.c. arc methods for these analytes. These results indicate that the carrier-distillation-ICP combination shows promise as a sensitive and precise method for analysis of trace metallic elements in a refractory matrix with a complex spectrum.
Analytica Chimica Acta | 1979
B.M. Patel; Paru M. Bhatt; Neelam Gupta; M.M. Pawar; B. D. Joshi
Abstract An atomic absorption spectrometric method with graphite tube atomization is described for the direct determination of cadmium (0.1–5 ppm), chromium (1–30 ppm) and cobalt (1–30 ppm) in uranium dissolved in nitric acid, with relative standard deviations of 5–10%. The presence of up to 7 mg of residual uranium in the carbon tube and 1000 ppm each of calcium, iron, silicon, tungsten and zinc in the sample did not cause any interference, but sample and standard solutions must contain the same concentrations of uranium.
Fresenius Journal of Analytical Chemistry | 1983
A. G. Page; K. H. Madraswala; S. V. Godbole; Madhuri J. Kulkarni; Vanita S. Mallapurkar; B. D. Joshi
ZusammenfassungDas Trägerdestillationsverfahren zur selektiven Verdampfung von Spurenmetallen in U3O8 im Gleichstrombogen wurde mit induktiver Probeerhitzung für ICAP angepaßt. Die experimentellen Parameter wurden für die direkte Bestimmung von Cd, Cu, K, Na, Ni und Pb optimiert. Die Leistungsfähigkeit des Verfahrens wurde mit Hilfe von Proben mit bestimmten Zusätzen sowie mit zertifiziertem Referenzmaterial überprüft (Standardabweichung 2–9%). Durch die Verbindung der Vorteile von Trägerdestillation und ICAP bietet sich eine Methode von hoher Präzision.SummaryA new approach for the trace metal assay of U3O8 powder has been described. The carrier distillation technique used for selective volatilization of trace metals in U3O8 with d.c. arc excitation is adapted for the release of analytes from the solid sample into the ICAP source by inductively heating the sample. The experimental parameters have been optimised for the direct determination of Cd, Cu, K, Na, Ni and Pb. The performance of the method developed here is tested for the precision and accuracy of determinations by analysing spiked U3O8 samples and NBL U3O8 reference standards (standard deviation 2–9%). The method appears promising to be developed as a highly precise analytical optical emission spectrometric method as it adds to the ingenuity of the carrier distillation method, the advantages of ICAP.
Analytica Chimica Acta | 1980
B.M. Patel; Neelam Gupta; Paru J. Purohit; B. D. Joshi
Abstract Graphite furnace atomization is used for the direct determination of Li (0.25–4 ppm), Na (8–70 ppm), K (20–300 ppm) and Cu (0.5–25 ppm) in uranium dissolved in nitric acid, with relative standard deviations of 4–9%. Only iron seriously depresses the signals from the alkali metals.
Journal of Luminescence | 1977
B. D. Joshi; A.G. Page
Abstract The data on the fluorescence and absorption spectra of the Tb 3+ ions in yttrium-gallium garnet in the region 3800–6800 A have been obtained at 4.2 K and 77 K. The groups of fluorescence lines in the regions 3800–4830 A and 4860–6800 A have been assigned to transitions from 5 D 3 and 5 D 4 , respectively, to the Stark components of 7 F states. The analysis of the spectra led to the identification of six Stark components each for the 5 D 3 and 5 D 4 states and thirty-six components of 7 F states. The local symmetry arround the Tb 3+ ions is found to be orthorhombic, in accordance with the complete removal of the degeneracy of the 7 F 5 and 7 F 1 electronic states.
Journal of Luminescence | 1975
B. D. Joshi; A. G. I. Dalvi; T. R. Bangia
Abstract The quenching constants for the UO 2+ 2 ion fluorescence by the Eu 3+ ion in H 2 O, D 2 O, potassium formate and acetic acid media were determined by measuring the decrease in intensity of the 5050 A fluorescence peak and the lifetime of the UO 2+ 2 ion fluorescence. The energy transferred to the Eu 3+ ion was found to be a small fraction of the energy lost by the UO 2+ 2 ion by the non-radiative processes. The variations of the quenching constants of the UO 2+ 2 ion and the fluorescence lifetimes were determined for different concentrations of potassium formate and acetic acid. These results indicate that the UO 2+ 2 ion forms inner sphere complexes with the two ligands mentioned.
Analytica Chimica Acta | 1971
B. D. Joshi; B.M. Patel; A.G. Page
Abstract An emission spectrographic method for the determination of traces of rare earths in plutonium with a LiF—AgCl carrier is described. The rare earths are separated from plutonium by anion exchange, concentrated and estimated. Thulium is used as an internal standard. The lowest detectable amounts areYb 0.001 μg; Eu, Gd 0.01 μg; Er, Lu 0.025 μg; Nd, Sm, Dy, Ho 0.05 μg; Ce, Pr, Tb 0.1 μg. The effect of microgram amounts of plutonium and thirteen common impurities on detection limits and determination is described. The coefficient of variation ranges from 6 to 12% for different elements.
Fresenius Journal of Analytical Chemistry | 1983
B.M. Patel; Neelam Goyal; Paru J. Purohit; A. R. Dhobale; B. D. Joshi
ZusammenfassungDas beschriebene AAS-Verfahren (mit Graphitofen-Atomisierung) wurde zur direkten Bestimmung von 1–20 ppm Mg, 1–30 ppm Mn, 1–50 ppm Ni sowie 10–400ppm Zn in Uranlösungen eingesetzt. Die Proben wurden in Salpetersäure aufgelöst (20 mg/ml U) und aliquote Anteile direkt der AAS-Messung zugeführt. Bruchteile von Nanogrammen können in 100μg U mit Standardabweichungen von besser als 9% bestimmt werden. Probe und Standard müssen jedoch dieselbe Konzentration an U aufweisen. Das Verfahren ist schnell und genau durchführbar und wurde mit Hilfe von zertifiziertem U3O8-Referenzmaterial überprüft. Die Gegenwart von 9 mg Resturan in der Graphitröhre oder ppm-Mengen von 22 Begleitelementen oder 1000 ppm Ca, Fe, Si und Zn in der Probe verursachen keine Störung. 1000 ppm Fe stören jedoch die Bestimmung von Mg und Mn.SummaryAn atomic absorption spectrometric method with the graphite furnace atomization is described for the direct determination of magnesium (1–20 ppm), manganese (1–30 ppm), nickel (1–50ppm) and zinc (10–400ppm) in uranium solutions. The uranium samples were dissolved in nitric acid, with uranium concentration being 20 mg ml−1. Five microlitre sample aliquots were atomized directly from the graphite furnace for each measurement. Determination of these analytes at fractional nanogram and nanogram levels is possible in the presence of 100μg uranium sample with relative standard deviations better than 9%. However, sample and standard solutions must contain the same concentration of uranium matrix. The method is rapid and accurate as checked by analysing the certified NBL U3O8 reference samples. Presence of upto 9 mg of residual uranium in the carbon tube or ppm concentrations of 22 concomitant metallic elements or even 1,000 ppm each of calcium, iron, silicon and zinc in the sample did not cause any significant interference. However, the interference due to 1,000 ppm of iron on magnesium and manganese was found to be significant.
Fresenius Journal of Analytical Chemistry | 1983
A. G. I. Dalvi; T. K. Sheshagiri; V. Natarajan; M. K. Bhide; Y. Babu; M. D. Sastry; B. D. Joshi