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  • Author or Editor: S. Mahajan x
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Abstract  

Ancient iron objects excavated from five different sites around Nagpur city in Maharashtra State /India/ were cut into small pieces and samples were prepared. Each sample was irradiated with 14 MeV neutrons for 8 min. From the recorded gamma ray spectrum for each sample, the presence of trace elements Cu, Si, Al, Mg and Mn were detected and their mutual ratios of activities were determined. The results show that all the iron objects obtained from five different sites are of the same origin.

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Abstract  

Determination of fluoride at trace level is important for the specification analysis of nuclear fuel samples. This is generally accomplished by pyrohydrolytic separation followed by ion selective electrode potentiometry. In the present work, a method has been developed for the determination of fluoride by radiometric assay of181Hf back-extracted from thenoyltrifluoracetone (HTTA) in benzene.181Hf back-extracted is proportional to the concentration of fluoride.

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Abstract  

Stability constants of the fluoride complexes of Pu(III), Sm(III) and Bi(III) in 1.0M NaClO4/HClO4 medium at 23±1°C have been determined by potentiometry using a fluoride ion-selective electrode. Plutonium was reduced to the trivalent state using quinhydrone with an excess to serve as holding reductant. The log values of concentration stability constants log 1, log 2, and log 3 are 3.58, 6.40 and 12.61 for Pu(III), 3.23, 5.81 and 10.54 for Sm(III) and 3.69, 6.13 and 11.04 for Bi(III), respectively. The log 2 values in all these cases have very large deviation and may be taken only as rough estimates.

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Summary

A new simple, accurate, precise, rapid, and selective densitometric TLC method has been established for simultaneous analysis of aceclofenac, paracetamol, and chlorzoxazone in tablets. Identification and quantification were performed on 10 cm × 10 cm aluminium-backed TLC plates coated with 0.2 mm layers of silica gel 60 F254, previously washed with methanol, and using toluene-2-propanol-ammonia 4:4:0.4 (υ/υ) as mobile phase. Detection was performed at 274 nm. The R F values of aceclofenac, paracetamol, and chlorzoxazone were 0.28 ± 0.01, 0.72 ± 0.02, and 0.51 ± 0.02, respectively. Calibration plots were linear in the range 400–1400 ng per band for aceclofenac, 2000–7000 ng per band for paracetamol, and 1000–3500 ng per band for chlorzoxazone, with correlation coefficients, r, 0.9995, 0.9993, and 0.9996, respectively. Recovery of aceclofenac, paracetamol, and chlorzoxazone were 99.54–100.44, 100.02–100.47, and 99.39–99.84%, respectively. The suitability of densitometric TLC for quantitative analysis of these compounds was proved by validation in accordance with the requirements of ICH Guidelines.

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