Determination of organophosphorous pesticides in wastewater samples using binary-solvent liquid-phase microextraction and solid-phase microextraction: A comparative study

作者：Basheer, Chanbasha; Alnedhary, Anass Ali; Rao, B. S. Madhava; Lee, Hian Kee^*

来源：Analytica Chimica Acta, 2007, 605(2): 147-152.

DOI：10.1016/j.aca.2007.10.006

• liquid-phase microextraction
• binary solvent
• solid-phase microextraction
• organophosphorous pesticides
• environmental analysis

A simple and efficient binary solvent-based two-phase hollow fiber membrane (HFM)protected liquid-phase microextraction (BN-LPME) technique for moderately polar compounds was developed. Six organophosphorous pesticides (OPPs) (triethylphosphorothioate, thionazin, sulfotep, phorate, disulfoton, methyl parathion and ethyl parathion) were used as model compounds and extracted from 10-mL wastewater with a binary-solvent (toluene: hexane, 1:1) mixture. Some important extraction parameters, such as extraction time, effect of salt, sample pH and solvent ratio composition were optimized. BN-LPME combined with gas chromatography/mass spectrometric (GC/MS) analysis provided repeatability (R.S.D.s <= 12%, n =4), and linearity (r <= 0.994) and solid-phase microextraction provides comparable of R.S.D.s <= 13%, n =4 and linearity (r= <= 0.966) for spiked water samples. The limits of detection (LODs) were in the range of 0.3-11.4ngL(-1) for BN-LPME and 3.1-120.5 ngL(-1) for SPME at (S/N = 3) under GC/MS selective ion monitoring mode. In addition to high enrichment, BN-LPME also served as a sample cleanup procedure, with the HFM act as a filtering medium to prevent large particles and extraneous materials from being extracted. To investigate and compare their applicability the BN-LPME and SPME procedures were applied to the detection of OPPs in domestic wastewater samples.

• 出版日期2007-12-19