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Solid-phase extraction cationic surfactants

Silica is appropriate with the cationics used in fabric softeners because their highly nonpolar character makes them suitable for normal phase chromatography. Adsorption of cationics on silica is more favored at high pH, usually 9-10. Silica is rarely used in solid phase extraction of surfactants because of the difficulty in removing the surfactant for subsequent analysis. Ethoxylates are particularly tightly bound, but low yields are found also with other surfactants. PEG is most tightly bound of all, and is best separated using Cm media. [Pg.175]

Other less used cationic surfactants, such as benzalkonium chloride (BAC), have been determined by solid-phase extraction followed by HPLC with post-column ion-pairing and FD detection in effluents from several European hospitals [123], whereas dihexyldimethyl ammonium... [Pg.492]

Martynkovd, K. Komendova, R. Fisera, M. Sommer, L. Solid phase extraction of molybdenum on modified octadecyl silica sorbents in the presence of cationic surfactants and on silica-based anionic exchanger and its determination by... [Pg.1456]

Chen, Y.-C., Tsai, M.-F. (2000) Sensitivity Enhancement for Nitrophenols Using Cationic Surfactant-modified Activated Carbon for Solid Phase Extraction (SPE)/Surface-assisted Laser Desorption Ionization (SALDI) Mass Spectrometry. Rapid Commun. Mass Spectrom. 14 2300-2304. [Pg.47]

Extraction and concentration schemes based on analyte solnbilization in cationic surfactant micelles, such as miceUar-assisted extraction, coacervative extraction (CAE) [6], micellar-enhanced ultrafiltration (MEUF), smd actant-assisted transport of solutes across bquid membranes (LSM), smd actant-mediated solid-phase extractions (MSPEs), and micellar sobd-phase microextractions (MSPMEs), can be cited [3],... [Pg.476]

Collection of Fe(II) on a nitrocellulose membrane filter in the form of ion associate with ferrozine and a cation surfactant was applied to the determination of Fe(II) in river and sea water samples [14]. Solid-phase spectrophotometry using ascorbic acid and ferrozine was employed to determine Fe in water, waste water, wine, soil extract, digested vegetal tissues, drugs and human hair [15]. [Pg.497]


See other pages where Solid-phase extraction cationic surfactants is mentioned: [Pg.146]    [Pg.315]    [Pg.4718]    [Pg.115]    [Pg.27]    [Pg.562]    [Pg.108]   
See also in sourсe #XX -- [ Pg.379 , Pg.380 ]




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