Premium
Reverse micelle‐mediated dispersive liquid–liquid microextraction of 2,4‐dichlorophenoxyacetic acid and 4‐chloro‐2‐methylphenoxyacetic acid
Author(s) -
Tayyebi Moslem,
Yamini Yadollah,
Moradi Morteza
Publication year - 2012
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.201200150
Subject(s) - chromatography , tetrahydrofuran , decanoic acid , chemistry , solvent , disperser , extraction (chemistry) , micelle , repeatability , detection limit , high performance liquid chromatography , gas chromatography , sample preparation , analytical chemistry (journal) , materials science , organic chemistry , aqueous solution , composite material
A supramolecular solvent consisting of reverse micelles of decanoic acid, dispersed in a continuous phase of tetrahydrofuran:water, was proposed as an efficient microextraction technique for extraction of selected chlorophenoxy acid herbicides from water samples prior to high‐performance liquid chromatography UV determination. The disperser solvent (1.0 mL tetrahydrofuran) containing 20 mg decanoic acid was rapidly injected into 10.0 mL of water sample. After centrifugation, the reverse micelle‐rich phase (25 ± 0.5 μL) was floated at top of the home‐designed centrifuge tube. The solvent was collected and 20 μL of it was injected into high‐performance liquid chromatography for analysis. The results showed that the in situ solvent formation and extraction process can be completed in a few seconds. Under the optimal conditions, limits of detection of the method for 4‐chloro‐2‐methylphenoxyacetic acid and 2,4‐dichlorophenoxyacetic acid were in the range of 0.5–0.8 μg L −1 and the repeatability of the proposed method, expressed as relative standard deviation, varied in the range of 2.5–3.2%. Linearity was found to be in the range of 1–200 μg L −1 and the preconcentration factors were between 148 and 157. The mean percentage recoveries exceeded 92.0% for all the spiking levels in real water samples.