科研之友
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摘要
Ultrasound-assisted emulsification-microextraction (USAEME) demonstrated its applicability for the analysis in waters of 2-phenylphenol (PP), 4-tert-butylphenol (TBP), benzothiazole (BTZ) and piperonyl butoxide (PBO), belonging to different chemical families, and all of them characterised by its high production volume. In the developed USAEME procedure, compounds were extracted in chloroform from 10mL of water sample during only 5min. The addition of derivatising reagents has been studied as part of the optimisation process. The optimised procedure provided an efficient and exhaustive extraction with the advantage that the extract was ready for GC analysis. The method was validated using real environmental water samples, obtaining recoveries between 68 and 111%, RSD values 10%, and limits of quantification at the sub-ng per millilitre level (0.004-0.072g L-1). The application of the method to the determination of the targets in different environmental waters showed their presence in most samples.In addition, the method allowed the study of the behaviour of the compounds in the presence of chlorine as disinfection agent, reporting for the first time that BTZ and PBO remained stable even at 4mgL(-1) of chlorine concentration, whereas the phenolic compounds (TBP and PP) required low chlorination levels to be transformed into mono- and di-chlorinated derivatives.
- 出版日期2014-1-2
