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Preconcentration of organochlorine pesticides in aqueous samples by dispersive liquid–liquid microextraction based on solidification of floating organic drop after SPE with multiwalled carbon nanotubes
Author(s) -
Mirzaei Mohammad,
Rakh Mojgan
Publication year - 2014
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201301058
Subject(s) - sorbent , chromatography , elution , detection limit , enrichment factor , aqueous solution , extraction (chemistry) , chemistry , acetone , calibration curve , tap water , solvent , sample preparation , analytical chemistry (journal) , adsorption , organic chemistry , environmental engineering , engineering
SPE joined with dispersive liquid–liquid microextraction based on solidification of floating organic drop ( DLLME ‐ SFO ) as a novel technique combined with GC with electron‐capture detection has been developed as a preconcentration technique for the determination of organochlorine pesticides ( OCP s) in water samples. Aqueous samples were loaded onto multiwalled carbon nanotubes as sorbent. After the elution of the desired compounds from the sorbent by using acetone, the DLLME ‐ SFO technique was performed on the obtained solution. Variables affecting the performance of both steps such as sample solution flow rate, breakthrough volume, type and volume of the elution, type and volume of extraction solvent and salt addition were studied and optimized. The new method provided an ultra enrichment factor (8280–28221) for nine OCP s. The calibration curves were linear in the range of 0.5–1000 ng/L, and the LOD s ranged from 0.1–0.39 ng/L. The RSD , for 0.01 μg/L of OCP s, was in the range of 1.39–13.50% ( n = 7). The recoveries of method in water samples were 70–113%.