Study on the effect of chain-length compatibility of mixed anionic–cationic surfactants on the cloud-point extraction of selected organophosphorus pesticides

Abstract A cloud-point extraction (CPE) method with Triton X-114 has been developed for analysis of six organophosphorus pesticides (OPPs) in apples and pears. In this CPE procedure, the effects of the surfactant volume, mass of sodium chloride, equilibrium temperature, equilibrium time, and pH on the extraction procedure were investigated. Under the optimal CPE conditions, the analytes were enriched 20-fold and the LODs dropped to 0.44–5.20 μg/kg. Furthermore, the proposed extraction method was validated by the correlation coefficient (R2) of the calibration curve, repeatability (RSD, n = 6), and fortified recoveries, which were 0.9967–0.9993, 2.7–6.5, and 74.7–104.5%, respectively. Based on these results, it could be concluded that the proposed CPE method with Triton X-114 was suitable for the effective extraction and enrichment of OPP residues in the apple and pear samples.

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Cloud point extraction coupled with ultrasonic-assisted back-extraction for the determination of organophosphorus pesticides in concentrated fruit juice by gas chromatography with flame photometric detection

Food Chemistry ◽

10.1016/j.foodchem.2010.12.122 ◽

2011 ◽

Vol 127 (2) ◽

pp. 683-688 ◽

Cited By ~ 47

Author(s):

Wei-jun Zhao ◽

Xiao-ke Sun ◽

Xiao-ni Deng ◽

Lin Huang ◽

Ming-min Yang ◽

...

Keyword(s):

Gas Chromatography ◽

Cloud Point ◽

Fruit Juice ◽

Cloud Point Extraction ◽

Organophosphorus Pesticides ◽

Back Extraction ◽

Photometric Detection ◽

Flame Photometric Detection ◽

Ultrasonic Assisted

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Mixed aggregate-based acid-induced cloud-point extraction and ion-trap liquid chromatography–mass spectrometry for the determination of cationic surfactants in sewage sludge

Journal of Chromatography A ◽

10.1016/s0021-9673(03)00565-x ◽

2003 ◽

Vol 998 (1-2) ◽

pp. 143-154 ◽

Cited By ~ 71

Author(s):

Francisco Merino ◽

Soledad Rubio ◽

Dolores Pérez-Bendito

Keyword(s):

Mass Spectrometry ◽

Liquid Chromatography ◽

Sewage Sludge ◽

Cloud Point ◽

Cationic Surfactants ◽

Cloud Point Extraction ◽

Ion Trap ◽

Liquid Chromatography Mass Spectrometry ◽

Trap Liquid

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Cloud Point Extraction Of Cationic Surfactants And Their Ionic Associates With Sodium Dodecyl Sulfate

METHODS AND OBJECTS OF CHEMICAL ANALYSIS ◽

10.17721/moca.2020.111-116 ◽

2020 ◽

Vol 15 (3) ◽

pp. 111-116

Author(s):

S.O. Lelyushok ◽

V.O. Doroschuk ◽

S. A. Kulichenko

Keyword(s):

Cloud Point ◽

Cationic Surfactant ◽

Anionic Surfactant ◽

Cationic Surfactants ◽

Cloud Point Extraction ◽

Sodium Dodecyl ◽

Ionic Surfactant ◽

Rich Phase ◽

Ionic Associates ◽

Extraction Degree

The distribution of individual cationic surfactants and their ionic associates with the anionic surfactant in the cloud point extraction systems, based on non-ionic surfactant OP-7 was investigated. Determined that the dependence of the extraction degree of halides alkylpyridiniums on carboxylic change length in optimal conditions for extraction is characterized by the existence of maximum for cationic surfactant where n = 12. Decrease as well as increase in carboxylic change length of cation of alkylpyridiniums diminishes the effectiveness of their extraction into the surfactant-rich phase. The peculiarities of inter phase distribution of ionic associates cationic surfactant – anionic surfactant in the micellar extraction systems are investigated. It was shown, that with the increase in carboxylic change length of cationic surfactant the dependence of extraction degree of associates with anionic surfactant is characterized by the existence of the maximum. Most effective into the surfactant-rich phase extracted of ionic associates of three- and tetradecylpyridinium. Decreasing and increasing of hydrophobicity of alkylpyridiniums diminishes the effectiveness of extraction of associates. The established effects are explained by the hydrophobic correspondence between the substrate and the surfactant-rich phase of non-ionic surfactant.

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