Journal
JOURNAL OF SEPARATION SCIENCE
Volume 39, Issue 2, Pages 412-418Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201500970
Keywords
Attapulgite; Benzoylurea insecticides; Cyclodextrins; Dispersive micro-solid-phase extraction; Sorbents
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Funding
- National Natural Science Foundation of China [21277172, 21377163]
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A beta-cyclodextrin-modified attapulgite composite was prepared and used as a dispersive micro-solid-phase extraction sorbent for the determination of benzoylurea insecticides in honey samples. Parameters thatmay influence the extraction efficiency, such as the type and volume of the eluent, the amount of the sorbent, the extraction time and the ionic strength were investigated and optimized using batch and column procedures. Under optimized conditions, good linearity was obtained for all of the tested compounds, with R-2 values of at least 0.9834. The limits of detection were determined in the range of 0.2-1.0 mu g/L. The recoveries of the four benzoylurea insecticides in vitex honey and acacia honey increased from 15.2 to 81.4% and from 14.2 to 82.0%, respectively. Although the beta-cyclodextrin-modified attapulgite composite did not show a brilliant adsorption capacity for the selected benzoylurea insecticides, it exhibited a higher adsorption capacity toward relatively hydrophobic compounds, such as chlorfluazuron and hexaflumuron ( recoveries in vitex honey samples ranged from 70.0 to 81.4% with a precision of 1.0 3.7%). It seemed that the logP(ow) of the benzoylurea insecticides is related to their recoveries. The results confirmed the possibility of using cyclodextrin-modified palygorskite in the determination of relatively hydrophobic trace pharmaceutical residues.
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