Abstract
<p>The method of determination for uranium and thorium in the industrial phosphoric acid by wavelength-dispersive X-ray fluorescence spectrometry (WDXRF) responds positively to all the validation tests and can be adopted for the dosage for these elements. It is clear that the procedure of the proposed method is simple and requires less time to complete the analysis. The concentration for uranium and thorium in the Tunisian phosphoric acid is in the order of 22 ppm for uranium with a coefficient of variation of 0.77% and of about 4 ppm for thorium with a coefficient of variation of 1.37%.</p>
Highlights
Industrial Phosphoric acid is one of the most important products of the chemical industry, it is used in the manufacture of phosphate fertilizers; TSP: Ca(H2PO4)2 and DAP: (NH4)2HPO4, feed livestock (CaHPO4.2H2O) and sequestering phosphate
In this work we focus on uranium and thorium and to techniques for determining these elements
Another method to extract the uranium present in an aqueous phase; we have the extraction of the uranium using the D2EHPA and Synergistic D2EHPA-TOPO Mixture (Ali et al, 2012; Beltrami et al, 2013; Beltrami et al, 2014; Orabi et al, 2015), using a synergistic DOPPA–TOPO mixture (Krea and khalaf, 2013), using of DNPPA and bidentateoctyl(phenyl) CMPO (Mondal et al, 2014) and the adsorption method of the uranium ( Hussein and Morsy, 2011; Morsy and Hussein, 2012; Ahmed et al, 2016) - The spectrophotometric method; ion UO22+ make a chelate with meloxicam by the following reaction: 2 + UO22+ → UO2(meloxicam)2 + 2H+, the product is a yellow complex with an absorbance passes through a maximum at 398 nm (Lutfullah et al, 2008)
Summary
Industrial Phosphoric acid is one of the most important products of the chemical industry, it is used in the manufacture of phosphate fertilizers; TSP: Ca(H2PO4) and DAP: (NH4)2HPO4, feed livestock (CaHPO4.2H2O) and sequestering phosphate (sodium hexametaphosphate). Thorium (IV) and uranium (VI) are quantitatively eluted with HCl 2 mol L-1 and determined by inductively coupled plasma coupled to mass spectrometry (ICP-MS) Another method to extract the uranium present in an aqueous phase; we have the extraction of the uranium using the D2EHPA and Synergistic D2EHPA-TOPO Mixture (Ali et al, 2012; Beltrami et al, 2013; Beltrami et al, 2014; Orabi et al, 2015), using a synergistic DOPPA–TOPO mixture (Krea and khalaf, 2013), using of DNPPA and bidentateoctyl(phenyl) CMPO (Mondal et al, 2014) and the adsorption method of the uranium ( Hussein and Morsy, 2011; Morsy and Hussein, 2012; Ahmed et al, 2016) - The spectrophotometric method; ion UO22+ make a chelate with meloxicam by the following reaction: 2 (meloxicam H) + UO22+ → UO2(meloxicam)2 + 2H+ , the product is a yellow complex with an absorbance passes through a maximum at 398 nm (Lutfullah et al, 2008). XRF is used for the determination of thorium in the range of 0.1 to 1.2% of the plutonium in (Woltermanet al., 1974)
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