期刊
ANALYTICA CHIMICA ACTA
卷 599, 期 1, 页码 92-97出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2007.07.065
关键词
sewage sludge; alkylbenzene sulfonates; microwave-assisted extraction; liquid chromatography
A new approach has been developed for the monitoring of linear alkylbenzene sulfonates (LAS) (C-10-C-13) in sewage sludge. It is based on microwave-assisted extraction (MAE) prior to high performance liquid chromatography coupled with diode array (HPLC-DAD) and fluorescence (HPLC-FL) detectors. Column Zorbax XDB-C8. 150 mm x 4.6 mm i.d., 5 mu m particle size was used as well as acetonitrile-water containing 0.1 M NaClO4 (65:35) and isocratic elution. Compounds were isocratically eluted over 6 min runtime at a flow rate of 1 mL min(-1). Since polar interferences are eluted between 0 and 2 min, they do not interfere in the analysis. The column was thermostated at a temperature of 25 degrees C. For the determination of LAS, DAD-UV (lambda(ex), = 225 nm) and fluorescence (lambda(ex) = 225 nm, lambda(em) = 295 nm) detectors were employed. The main factors affecting the extraction efficiency (extractant volume, microwave power and irradiation time) were optimized using a compost sludge. The detection limit for total LAS in the sludge was <5 mg kg(-1). The extraction of C-10-C-13 homologues is carried out by using an extraction time of 10 min and 5 mL of methanol; whereas Soxhlet needs a 12 h extraction. The method did not require clean-up or preconcentration steps. Concentration levels of LAS were between 13037 mg kg(-1) for digested sludge and 2492 mg kg-' for compost sludge. (c) 2007 Elsevier B.V. All riahts reserved.
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