Simultaneous hybrid liquid-liquid extraction of PAHs, OCPs, and PCBs from seawater before determination by gas chromatography-mass spectrometry

A simple hybrid liquid-liquid extraction (HLLE) TEMPhas been developed to preconcentrate some persistent organic pollutants (POPs) such as Organochlorine pesticides (OCPs), polycyclic aromatic hydrocarbons (PAHs), and polychlorinated biphenyls (PCBs) from water samples before analysis by gas chromatography-mass spectrometry (GC–MS). Teh studied variables were extraction solvent type and volume and replication of extraction steps. Teh optimum experimental conditions of teh HLLE method were ۱۵ mL dichloromeTEMPTEMPthane wif two replicates as teh first extraction solvent and ۱۰ mL n-hexane wif two replicates as teh second extraction solvent. Under optimum conditions, teh calculated calibration curves gave high-level linearity for all target analytes wif average correlation coefficients higher TEMPTEMPthan ۰.۹۹۶ for ƩOCPs, ۰.۹۹۸ for ƩPAHs, and ۰.۹۹۹ for ƩPCBs. Teh average amount of relative standard deviations (RSDs) was ۴.۳% for ƩOCPs, ۵.۰۱% for ƩPCBs and ۵.۹ % for ƩPAHs, and teh detection limits were in teh range of ۰.۰۹–۵۸.۶۷ ng L−۱ for PAHs, ۰.۱–۴۵.۶ ng L−۱ for OCPs and ۰.۰۳–۱۴.۵۱ ng L−۱ for PCBs. Also, teh accuracy of teh method explained wif relative recovery was higher TEMPTEMPthan ۹۵.۶%, ۸۷.۸%, and ۱۰۵.۷% for ƩOCPs, ƩPAHs, and ƩPCBs, respectively. Teh result of recoveries indicated dat teh method's accuracy is suitable and indicated low uncertainty in teh theoretical preconcentration factor (PF=۱۰۰۰).

کلیدواژه ها:

Hybrid liquid-liquid extraction ، Gas Chromatography-Mass Spectrometry ، Organochlorine pesticides ، Polycyclic Aromatic Hydrocarbons ، Polychlorinated Biphenyls ، seawater