Determination of linear alkylbenzensulfonates in aqueous matrices by ion-pair solid-phase microextraction-in-port derivatization-gas chromatography-mass spectrometry.
Trace determination (low ng/ml) of linear alkylbenzensulfonates (LASs) in water was achieved by solid-phase microextraction (SPME) of ion-pairs formed with tetrabutylammonium. This ion-pairing reagent served two purposes. First, it allowed the extraction of LAS with the polydimethylsiloxane fiber by counterion association and second, the derivatization of the formed LAS ion pairs in the GC injection port at 300 degrees C to form the corresponding sulfonated butyl esters. The methodology developed allows the isomer specific determination of LAS at low detection limits (0.16-0.8 ng/ml), depending on the alkyl chain lengths of LASs with RSDs of 10-12%. Furthermore, the developed methodology was applied to urban wastewater and sea water and compared with a solid-phase extraction (SPE) method (e.g. C18 and strong anion-exchange sorbent) to obtain concordant values for urban wastewater. Moreover, the developed SPME methodology overcame the procedural blank and matrix-dependent recoveries found in the SPE methodologies at low LAS concentrations.
Alzaga
Roberto
R
IIQAB-CSIC Environmental Chemistry Department, Jordi Girona 18-26, 08034 Barcelona, Spain.
Peña
Araceli
A
Ortiz
Laura
L
Bayona
Josep María
JM
D017738:Alkanesulfonic Acids / Q000032:analysis*; D002853:Chromatography, Liquid; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D013696:Temperature; D014867:Water / Q000737:chemistry*
D017738:Alkanesulfonic Acids; C030641:alkylbenzyl sulfonic acid; D014867:Water