Selective determination of total vanadium in water samples by cloud point extraction of its ternary complex

Cloud point extraction of vanadium in pharmaceutical formulations, dialysate and parenteral solutions using 8-hydroxyquinoline and nonionic surfactant

“…The CPE is an impressive alternative to conventional solvent extraction because it produces high extraction efficiencies and enrichment factors, where as for CPE inexpensive and non-toxic reagents are required. The use of CPE process for extraction of metal chelates, biological and clinical samples and environmental clean-up procedure have been reported [29][30][31].…”

Determination of subnanomolar concentrations of vanadium in environmental water samples using flow injection with luminol chemiluminescence detection

“…Various analytical methods have been reported for the speciation and quantification at trace levels of vanadium in diverse samples. These techniques include; spectrophotometry (10,11), flow injection spectrophotometry (12,13), and spectrofluorimetry (14), air‐segmented continuous flow analysis (15), potentiometry (16), cathodic stripping voltammetry (17), thermometry (18), flame and electrothermal atomic absorption spectrometry (19,20), X‐ray spectrofluorimetry (21), inductively coupled plasma‐atomic emission spectroscopy (ICP‐AES), (22), ICP‐mass spectrometry (23), capillary zone electrophoresis with UV detection (24), and liquid chromatography (25). Some of these methods are sensitive and accurate but are expensive and time‐consuming and require skillful operators.…”

Determination of cadmium in rice and water by tungsten coil electrothermal vaporization-atomic fluorescence spectrometry and tungsten coil electrothermal atomic absorption spectrometry after cloud point extraction

“…The small volume of the surfactant-rich phase obtained from CPE permits the design of extraction schemes of simplicity, high efficiency, rapidness and environmental friendliness, compared with conventional liquid-liquid extraction using organic solvents [2][3][4]. The application of CPE as sample preparation method has been well-documented in the literature for a variety of instrumental methods, such as flame atomic absorption spectrometry (FAAS) [5,6], inductively coupled plasma optical emission spectrometry (ICP-OES) [7,8], inductively coupled plasma mass spectrometry (ICP-MS) [9,10], gas chromatography (GC) [11], high-performance liquid chromatography (HPLC) [12,13], capillary electrophoresis (CE) [14][15][16], and chemiluminescence (CL) [17]. Apart from analyte preconcentration, CPE can also effectively eliminate the matrix effect encountered in ultrasensitive detection schemes, for example, ICP-MS [18] and graphite furnace atomic absorption spectrometry (GF-AAS) [19,20].…”