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Abstract  

The influence of micelles, formed by the aggregation of nonionic surfactant molecules, on positronium formation (combination of e and e+) probability is discussed in the light of radiation chemical phenomenon at the end part of the radiation track. The contribution due to the parapositronium/narrow-component intensity in the presence of micellar aggregation and further structural reorganization constitutes important aspects of the ortho-para conversion process.

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Abstract  

A solvent extraction procedure for the separation of niobium and tantalum has been developed. The method consists of extracting tantalum from its aqueous mixture with niobium, with the help of di(2-ethylhexyl)phosphoric acid (HDEHP) in n-heptane. The aqueous feed consists of niobium and tantalum in an aqueous medium containing hydrochloric and oxalic acids. The concentrations of niobium and tantalum were raised to 1 mg/ml in the aqueous solution. The extraction efficiency of tantalum under these conditions was found to be 85%. Effects of chloride and oxalate ions as well as those of the concentration of HDEHP on the extraction efficiency were studied and discussed in detail.

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Acta Chromatographica
Authors:
M. Ganesh
,
B. Thangabalan
,
R. Patil
,
D. Thakur
,
A. Kumar Kumar
,
M. Vinoba
,
S. Ganguly
, and
T. Sivakumar

Summary

A rapid, simple and validated reversed-phase high-performance liquid chromatographic method has been developed for analysis of oxaprozin in pharmaceutical dosage forms. Oxaprozin was separated on an ODS analytical column with a 45:55 (v/v) mixture of acetonitrile and triethanolamine solution (5 mm, pH 3.5 ± 0.05, adjusted by addition of 85% phosphoric acid) as mobile phase at a flow rate of 2.0 mL min–1. The effluent was monitored by UV detection at 254 nm. Calibration plots were linear in the range 160 to 240 μg mL–1 and the LOD and LOQ were 14.26 and 41.21 μg mL–1, respectively. The high recovery and low relative standard deviation confirm the suitability of the method for routine QC determination of oxaprozin in tablets.

Open access