Free Access
Volume 27, Number 9, November 1999
Page(s) 758 - 764
Section Original articles
Analusis 27, 758-764 (1999)
DOI: 10.1051/analusis:1999141

Development of an analytical procedure for the measurement of nonionic aliphatic polyethoxylated surfactants in raw wastewater

G. Crétier, C. Podevin and J.-L. Rocca

Laboratoire des Sciences Analytiques, Université Claude Bernard - Lyon I, 43, boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France

(Received July 20, 1999; revised October 10, 1999; accepted October 15, 1999.)

An analytical procedure has been developed for determining aliphatic alcohol ethoxylates (AAEs) in raw wastewater. AAEs were isolated by solid-phase extraction on a styrenedivinylbenzene disk. The maximum volume that was processed without plugging of the disk was 20 mL. Then AAEs were desorbed with methanol and, after evaporation to dryness, the residue was analyzed by reversed-phase liquid chromatography coupled to mass spectrometry via atmospheric pressure interface. Two desorption temperatures (ambient and 100 oC), two organic modifiers of the mobile phase (methanol and acetonitrile) and two atmospheric pressure interfaces (electrospray and atmospheric pressure chemical ionization) were tested. The lowest coefficients of variation for replicate measurements were obtained by desorbing AAEs from the extraction disk at 100 oC and by using methanol-based mobile phase with atmospheric pressure chemical ionization source for extract analysis. Under these conditions, all the analytes (ranging in size from 10 to 16 alkyl carbons and from 1 to 25 ethoxylate groups) were recovered at more than 70 % and the limit of quantification (signal-to-noise ratio = 10) ranged between 0.05 and 4 $\mu$g L-1.

Key words: Alkylethoxylated surfactants -- Solid-phase extraction -- Liquid chromatography -- Mass spectrometry.

© EDP Sciences, Wiley-VCH 1999