Colorimetric Determination of Uranium with Thiocyanate

Spectrophotometric Determination of U(VI) with Rifampicin in Soil Samples

“…The amount of U(VI) was also estimated by the reference method. 12 Procedure for Reference Method 12 Aliquots (0.125-1.5 mL) of 1.992 × 10 -3 M uranyl nitrate were pipetted into a series of 25 mL standard volumetric flasks. To each flask, 10 mL of 0.2 M HCl, 2.0 mL of 10% SnCl 2 .2H 2 O in 1.16 M HCl and 7 mL of 6.57 M NH 4 SCN were added and diluted up to the mark with distilled water.…”

“…1,2 The literature citation revealed that there are various analytical techniques for the estimation of uranium which include thin layer chromatography, 3 gravimetry, 4 titrimetry, 5 fluorimetry, 6,7 potentiometry, 8 polarography, 9 X-ray fluorescence, 10 inductively coupled plasma mass spectrometry. 11 In addition, spectrophotometric methods have also been employed to determine U(VI) in presence of thorium(IV), 12 ore leachates, 13 natural waters, [14][15][16] process streams of a uranium extraction plant 17 and soil. 18 Moreover, the gravimetric method generally requires the prior separation of interfering elements whereas multiple steps are involved in the titrimetric method.…”

Optimized and validated spectrophotometric method for the determination of uranium(VI) via complexation with meloxicam

“…The pH of the solution was adjusted to 4 by the addition of ammonia and the final volume of the solution was maintained to 20 mL. The concentration of uranyl ion was determined by the proposed procedure and the reference method [19].…”

“…Procedure for reference method [19] Into a series of 25 mL standard volumetric flasks, different volumes (0.125-1.5 mL) of 0.1% uranyl nitrate hexahydrate were pipetted. To each flask, 10 mL of 0.2 N HCl, 2.0 mL of 10% SnCl 2 ·2H 2 O in 1.16 N HCl, 7 mL of 6.57 M NH 4 SCN and diluting to volume with distilled water.…”

“…Spectrophotometry is increasingly employed in process control owing to its simplicity and adaptability. Most of the reported spectrophotometric methods are tedious and time consuming because they involve prior separation of uranium from impurities by solvent extraction and reduction of Fe(III) to Fe(II) to avoid interference followed by the addition of chromophoric reagents such as thiocyanate [19], hydrogen peroxide [20], hexacyanoferrate(II) [21] and malachite green [22] to the organic phase. Therefore, there is need for a simple and selective spectrophotometric method for the determination of uranium in the presence of some other metal ions.…”