Simultaneous preconcentration and determination of U(VI), Th(IV), Zr(IV) and Hf(IV) ions in aqueous samples using micelle-mediated extraction coupled to inductively coupled plasma-optical emission spectrometry

A New Thioamide Derivative for Separation and Preconcentration of Multi Elements in Aquatic Environment by Cloud Point Extraction

“…Due to the low concentration of these metals in the environmental and biological samples and interfering effects, a preconcentration/separation technique is generally necessary prior to the determination. For this purpose, various analytical procedures have been used, such as adsorption on activated carbon [3,4] co-precipitation [5,6] column extraction [7,8] ion-selective electrode [9,10] liquid-liquid extraction (LLE) [11] and cloud-point extraction (CPE) [12][13][14][15][16][17][18][19][20][21][22].…”

“…Moreover, It is simple, cheap, highly efficient, fast, and of lower toxicity than those extractions that use organic solvents. This method has been applied for extraction and preconcentration of some metal ions such as Cu, Ni, Co and Zn in water samples [12], Ag, Zn, and Pb in environmental samples [13], Mo in sea water [14], Cd, Pb, Pd and Ag in environmental samples [15], Cr, Pb, Cu, Ni, Bi, and Cd in environmental samples [16], Cd, Cu, Co and Ni in water [17], U, Th, Zr and Hf in aqueous samples [18], Be in water [19], La, Eu and Lu [20], Rh [21] and Yb, Gd, Eu, Sm, Sc, Ho in biological samples [22].…”

Ionic liquid dispersive microextraction and spectrophotometric determination of trace uranyl ion in water samples

“…This stringent level regulation made scientist develop new analytical techniques for accurate determination uranium in trace levels in water samples. A variety of analytical methods including inductively coupled plasma mass spectrometer (ICP-MS), inductively coupled plasma atomic emission spectrometry (ICP AES), neutron activation analysis (NAA), energy dispersive x-ray fluorescence has been used for accurate determination of uranium [4,5]. However, the mentioned techniques required high cost, sophisticated instruments.…”

Solvent Extraction, Preconcentration and Determination of Thorium with Monoaza 18-Crown-6 Derivative

“…5,6 The determination of thorium by instrumental techniques, such as ICP-AES, ICP-MS and NAA, is still difficult because of insufficient sensitivity, lack of selectivity, presence of complex matrix, poor precision and accuracy. [7][8][9][10] Preconcentration of trace elements holds an important place among the techniques used in modern analytical chemistry. Preconcentration has increased the possibilities of many analytical determinations by eliminating the matrix effect which often worsens significantly the detection limits and other metrological parameters of the procedure and which can sometimes prevent the determination of one more trace element.…”