Determination of uranium, iron, copper, and nickel in rock and water samples by MEKC

Abstract

A micellar electrokinetic capillary chromatographic (MEKC) procedure has been developed for the separation and determination of dioxouranium (VI), iron(III), copper(II), and nickel(II) using bis(salicylaldehyde)propylenediimine (H2SA2Pn) as chelating reagent with a total run time of <3 min. Sodium dodecyl sulphate (SDS) was used as micellar medium at pH 8.1 with sodium tetraborate buffer (0.1 M). Uncoated fused silica capillary with effective length 38.8 cmx75 microm id was used with an applied voltage of 30 kV and photo-diode array detection at 228 nm. Linear calibrations were established within 0.045-1000 microg/mL of each element with detection limit within 15-122 ng/mL. The method was applied to the analysis of spring water and rock samples. The presence of uranium in rock and spring water samples was established within 1.58-1739.3 microg/g and 0.047-0.712 microg/mL with relative standard deviation within 0.9-2.1% and 1.3-2.6% respectively. Uranium ore and water samples were also assayed by the standard addition technique. Recovery of uranium was >98% with RSD up to 2.7%. Copper, nickel, and iron in their combined matrix were concurrently determined within RSD 0.6-3.6% (n=5) and the results obtained were compared with those of flame AAS.

Micellar Electrokinetic Chromatographic Separation/Determination of Uranium, Iron, Copper and Nickel from Environmental Ore Samples Using Bis(salicylaldehyde)meso-stilbenediimine as Chelating Reagent

“…The electrophoretic mobility of dioxouranium(VI) complex in the presence of surfactant tetrabutyl ammonium bromide, Tween 40 and SDS at CMC was examined in sodium acetate, ammonium acetate, sodium tetraborate and sodium carbonate buffers within pH 3-9. A significant increase in electrophoretic mobility and an improvement in the peak shape were observed with a complete separation of uranyl complex from derivatizing reagent using SDS and sodium tetraborate buffer as has been observed for related derivatizing reagents 8,9,39 .…”

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Uranium is well known for its use as nuclear fuel and is increasingly being used for power generation. The sensitive methods for determination of uranium are based on inductively coupled plasma mass spectrometry (ICP-MS) 1,2 , inductively coupled plasma atomic emission spectrometry (ICP-AES) 3 , X-ray fluorescence spectrometry 4 , activation analysis 5 , high performance liquid chromatography (HPLC) 6 and capillary electrophoresis (CE) [7][8][9] . High sensitivity and selectivity for the determination of uranium is reported using HPLC with appropriate complexing reagents.

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“…Micelles are formed in solution, when a surfactant is added in concentration above its critical micelle concentration (CMC) 29 . Capillary electrophoresis has been reported for the determination of U(VI) in the presence of metal ions using 4-(2thiazolazo) resorcinol 30 , 2,6-diacetylpyridine bis(N-methylenepyridenohydrazone) 31 , 2-[(2-arsenophenyl)-azo]-1,8-dihydroxy-7-[(2,4,6-tribromophenyl)-azo]-naphthelene-3,6-disulfonic acid 32 , arsenazo III 33 , 2-(2-arseno-phenylazo)-1,8-dihydroxyl-7-(4-chloro-2,6-dibromophenyl azo)-naphthalene-3,6-disulfonic acid 7 , bis(salicylaldehyde) ethylenediimine (H2SA2en) 8 , bis(salicylaldehyde) propylenediimine (H2SA2Pn) 9 and bis(acetylacetone) ethylenediimine.…”

Simultaneous determination of rare earth elements in ore and anti-corrosion coating samples using a portable capillary electrophoresis instrument with contactless conductivity detection

“…Indeed, the simplest format of the technique, namely capillary zone electrophoresis (CZE) has been reported for the determination of REEs in different matrices, using UV-vis (UV-vis) detection [16][17][18][19][20][21][22][23], laser induced fluorescence (LIF) detection [24,25], mass-spectrometric detection [26] or detection by ICP-MS [27,28]. Other modes of CE have also been used for this purpose, notably micellar electrokinetic chromatography (MEKC) [29][30][31], electrokinetic supercharging (ESK) [32] and isotachophoresis (ITP) [33]. Complexation with suitable UV/Vis or fluorescence absorbing ligands was needed to enable optical detection of the REEs.…”

Synthesis, characterisation and application of mercapto- and polyaminophenol-bifunctionalised MCM-41 for dispersive micro solid phase extraction of Ni(II) prio to inductively coupled plasma-optical emission spectrometry (DMSPE-ICP-OES)

“…However, many environmental analytical chemists have been focused on the monitoring and measuring of this element polluting the ecosystems. Various techniques such as flame atomic absorption spectrometry [4], micellar electrokinetic capillary chromatography [5], inductively coupled plasma optical emission spectrometry (ICP-OES) [6], electrochemical analysis [7] and inductively coupled plasma mass spectrometry (ICP-MS) [8] are available for the determination of nickel for most applications. Nevertheless, it is clear that all of the mentioned methods (with the exception of ICP-MS) cannot *Corresponding author.…”