Cloud Point Extraction-Inductively Coupled Plasma Mass Spectrometry for Separation/Analysis of Aqueous-Exchangeable and Unaqueous-Exchangeable Selenium in Tea Samples

Separation/preconcentration of ultra-trace levels of inorganic Sb and Se from different sample matrices by charge transfer sensitized ion-pairing using ultrasonic-assisted cloud point extraction prior to their speciation and determination by hydride generation AAS

“…It was utilized 1.5 mL of the samples prepared as described in ''Section 2.4'' for analysis. The reliability was checked by recovery 21 rates from spiked samples. Their recoveries of Sb and Se were quantitatively in the acceptable range of 93-107 %, respectively.…”

“…The UA-CPE has efficiently been used in combination with various chromatographic and atomic techniques in order to determine simultaneously a number of analytes present in the samples using various detection techniques [10] whereas the CPE is used in separation and preconcentration of inorganic Sb and Se from different matrices using chelating agents pyronin B, azomethine-H, victoria pure blue BO and diethyldithiophosphate prior to speciation analysis by spectrophotometry, flame AAS and ICP-OES with hydride generation [11][12][13][14][15]. 4 After various preconcentration procedures such as coprecipitation [16], selective adsorption onto nanometer-sized TiO 2 [17], liquid-liquid microextraction (LLME) [2,18], headspace solid phase microextraction (HS-SPME) [10], ultrasound assisted-hollow fiber liquid-phase microextraction (UA-HF-LPME) [19], on-line ionic liquid dispersive microextraction (on line ILDME) [20], and cloud point extraction (CPE) [21,22], ultrasound-assisted emulsification microextraction (UA-EME) [23], on-line solid-phase extraction (SPE) using single-walled carbon nanotubes micro-column [24], several analytical techniques like graphite furnace atomic absorption spectrometry (GF-AAS) [2], inductively coupled plasma optical emission spectroscopy (ICP-OES) [10], gas chromatography-mass spectrometry (GC-MS) [18], electrothermal atomic absorption spectrometry (ETAAS) [22], hydride generation-double channel atomic fluorescence spectrometry (HG-DC-AFS) [24], hydride generation atomic fluorescence spectrometry (HG-AFS) [25][26][27], electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS) [28], gas chromatography-electroncapture detection (GC-ECD) [29], high performance liquid chromatography (HPLC/HG-AAS and HG-AFS) interfaced with atomic absorption and fluorescence spectrometry with hydride generation [30,31] includ...…”

Strategies to increase selectivity of analytical methods for As, Cr and Se speciation in biological samples: A review

“…After obtaining the surfactant-rich phase, various techniques can be used for quantification of the analyte, such as ICP-OES [21], ICP-MS [22], FAAS [23], (ETAAS) [24] and HGAAS [25].…”

Determination of trace amounts of Brown HT as a food dye by a CPE-scanometry method

“…Auxiliary methods, such as ultrasonic-assisted cloud point extraction (UA-CPE) [29], microwave-assisted cloud point extraction (MA-CPE) [30], CPE-SPE [31], CPE assisted by nanoparticles [32], and stirring-assisted cloud point extraction (SA-CPE) [33], are also applicable. CPE has been shown to be an effective procedure for analyte extraction, pre-concentration and purification that improves the sensitivity, selectivity, detection limit and other analytical characteristics prior to HPLC [34], GC [35], CE [36,37], spectroscopy [38,39], inductively coupled plasma (ICP) [40], atomic absorption spectrometry [41,42], spectrophotometry [43], HPLC-UV [13], paptode [25] and solution scanometry [44][45][46].…”