ABSTRACT
Petrovic and coworkers (2002) have described one such general analytical procedure based on SPE followed by LC/MS analysis. e solvent extracts in their method are analyzed by LC/MS under both atmospheric pressure chemical ionization and the EIS. Alkylphenols, alkylphenol ethoxylates, alcohol ethoxylates, and linear alkylbenzene sulfonates were measured in sediment and water samples by this procedure. Many halogenated derivatives of alkylphenol ethoxylates can also be measured by similar methods (Petrovic et al., 2001). e detection limits for these substances in water samples have been reported to range between 20 and 100 μg/L and that for sediment samples from 2 to 10 μg/kg. For sample extraction, C-18 SPE cartridges are most common for extracting aqueous samples. Other types of cartridges, such as Oasis HLB, EnviChrom P, and Isolute ENV+ are also suitable for use. e recoveries and extraction e - ciency of target compounds on these cartridges do not seem to vary with the sample pH range from 4 to 8. An LC/MS procedure using an electrospray interface reports lower detection limits in the range 0.06-17.5 μg/L for nonylphenol and its ethoxylates (Cespedes et al., 2006).
