Preconcentration and fluorimetric determination of polycyclic aromatic hydrocarbons based on the acid-induced cloud-point extraction with sodium dodecylsulfate

Abstract

The acid-induced cloud-point extraction (CPE) technique based on sodium dodecylsulfate (SDS) micelles has been used for preconcentration of ten representatives of polycyclic aromatic hydrocarbons (PAHs) for the following fluorescence determination. The effect of the acidity of solution, SDS and electrolyte concentrations, centrifugation time and rate on the two-phase separation process and extraction percentages of PAHs have systematically been examined. Extraction percentages have been obtained for all PAHs after CPE ranged from 67 to 93%. Pyrene was used as a fluorescent probe to monitor the micropolarity of the surfactant-rich phase compared with SDS micelles and this allows one to conclude that water content in micellar phase after CPE is reduced. The spectral, metrological and analytical characteristics of PAH fluorimetric determination after acid-based CPE with sodium dodecylsulfate are presented. Advantages provided by using CPE in combination with fluorimetric determination of PAHs are discussed. The determination of benz[a]pyrene in tap water is presented as an example.

Application of poly(butyl methacrylate-co-ethylene glycol dimethacrylate) monolith microextraction coupled with high performance liquid chromatography to the determination of polycyclic aromatic hydrocarbons in smoked meat products

“…The LOD values are comparable to the ones obtained with other methods, such as homogeneous LLE (0.02-0.18 g/L) [3], dispersive liquid-liquid microextraction and dispersive -solid-phase extraction (0.01-0.06 g/L) [4], SPE (0.001-0.15 g/L) [5], cloud-point extraction (0.0002-137 g/L) [11], and microwave-assisted extraction (0.09-1.5 g/L) [16].…”

“…Therefore, many other separation techniques have been developed. Accelerated or pressurized extraction [7][8][9], cloud-point extraction [10,11], membrane-assisted solvent extraction [12], ultrasonic-assisted extraction [13,14], Soxhlet extraction [8,15], microwave-assisted extraction [8,14,16], supercritical fluid extraction [17], and liquid-liquid microextraction [4] have found their applications in the preconcentration of PAHs.…”

Cloud-point extraction of selected polycyclic aromatic hydrocarbons by nonionic surfactants

“…Surfactant-based extraction methods to preconcentrate trace solutes of grave environmental concerns from aqueous solutions have become more and more attractive [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], as water is often utilized as the main solvent in such methods, in contrast to the massive use of volatile organics in the conventional liquid-liquid extraction techniques [18][19][20]. Among these surfactant-based extraction techniques, the one based on the clouding phenomenon of surfactants, called the cloud-point extraction (CPE) method, is the most popular [4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Cationic Micellar Precipitation for Simultaneous Preconcentration of Benzimidazole Anthelmintics in Milk Samples by High-Performance Liquid Chromatography

“…in different sample matrices. [10][11][12][13][14] This method has some disadvantages such as time-consuming, and requires a temperature control and centrifugation for phase separation.…”