Microwave-assisted cloud point extraction of Rh, Pd and Pt with 2-mercaptobenzothiazole as preconcentration procedure prior to ICP-MS analysis of pharmaceutical products

Separation, preconcentration and inductively coupled plasma-mass spectrometric (ICP-MS) determination of thorium(IV), titanium(IV), iron(III), lead(II) and chromium(III) on 2-nitroso-1-naphthol impregnated MCI GEL CHP20P resin

“…High level of alkali and earth alkali ions in the environmental samples is a main problem in the instrumental detection of heavy metal ions including inductively coupled plasma-mass spectrometry and atomic absorption spectrometry [6][7][8][9][10]. Separation-preconcentration systems including precipitation [11,12], liquid-liquid extraction [13][14][15], cloud point extraction [16,17], membrane filtration [18,19] and electroanalytical systems [20,21] are used to solve this problem. Separation and preconcentration of trace metal ions by solid phase extraction are also widely used for that purpose [22][23][24], due to its some important advantages like simplicity, fast analyzing time and simple adaptation to automation systems [25][26][27][28].…”

Liquid–liquid extraction and cloud point extraction for spectrophotometric determination of vanadium using 4-(2-pyridylazo)resorcinol

“…The solution volumes were made up to 40 cm 3 with distilled water. Next, the test tubes were heated to above the cloud point temperature (ca 65 • C) by two different modes: hot plate (85 • C; 15-150 min) or microwave irradiation (15-90 min) according to Simitchiev et al (2008). After heating, the samples were cooled in a freezer for 45 min and the upper aqueous layers were decanted by inverting the tubes.…”

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].…”