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Development of ultrasound‐assisted emulsification microextraction based on solidification of a floating organic droplet for determination of organochlorine pesticides in water samples
Author(s) -
Shu Bin,
Yang Zhaoguang,
Lee Hsiaowan,
Qiu Bo,
Li Haipu
Publication year - 2016
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.201501002
Subject(s) - chromatography , repeatability , extraction (chemistry) , chemistry , solid phase microextraction , acetone , dilution , detection limit , solvent , pesticide , gas chromatography , aqueous solution , electron capture detector , analytical chemistry (journal) , gas chromatography–mass spectrometry , mass spectrometry , physics , organic chemistry , biology , agronomy , thermodynamics
An ultrasound‐assisted emulsification microextraction based on the solidification of a floating organic droplet followed by gas chromatography with electron capture detection was developed for the simultaneous determination of 13 organochlorine pesticides in water samples. In the proposed method, ultrasound was applied to achieve the emulsification without addition of any dispersive solvent. In consequence, the volume of extraction phase remained unaffected by the ion strength of aqueous phase and high extraction recoveries were obtained. It was also found that dilution of the floating phase with acetone was necessary for preventing peak splitting in chromatogram. Under optimal conditions, the proposed method provided good sensitivity (the detection limits of organochlorine pesticides ranged from 1.3 to 3.9 ng/L) and good repeatability of extraction (below 6.5%, n = 5). The recoveries in reservoir and river water samples were between 75.8% and 96.9%.