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  • Solvent-based de-emulsification dispersive liquid-liquid microextraction combined with gas chromatography-mass spectrometry for determination of trace organochlorine pesticides in environmental water samples.

Solvent-based de-emulsification dispersive liquid-liquid microextraction combined with gas chromatography-mass spectrometry for determination of trace organochlorine pesticides in environmental water samples.

Journal of chromatography. A (2010-08-20)
Constantinos K Zacharis, Paraskevas D Tzanavaras, Konstantinos Roubos, Kico Dhima
ABSTRACT

In this work, we propose solvent-based de-emulsification dispersive liquid-liquid microextraction (SD-DLLME) as a simple, rapid and efficient sample pretreatment technique for the extraction and preconcentration of organochlorine pesticides (OCPs) from environmental water samples. Separation and analysis of fifteen OCPs was carried out by gas chromatography-mass spectrometry (GC/MS). Parameters affecting the extraction efficiency were systematically investigated. The detection limits were in the range of 2-50 ng L(-1) using selective ion monitoring (SIM). The precision of the proposed method, expressed as relative standard deviation, varied between 3.5 and 10.2% (n=5). Results from the analysis of spiked environmental water samples at the low-ppb level met the acceptance criteria set by the EPA.

MATERIALS
Product Number
Brand
Product Description

Supelco
m-Xylene, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
m-Xylene, ReagentPlus®, 99%
Supelco
m-Xylene, analytical standard
Sigma-Aldrich
m-Xylene, puriss. p.a., ≥99.0% (GC)