Abstract
Zeolite NaY modified with cetyltrimethylammonium bromide (CTAB) was considered for extraction/preconcentration of carbamate pesticides using an on-line SPE-HPLC system. The simultaneous determination of carbamate pesticides, including aldicarb, carbofuran, carbaryl, isoprocarb, methiocarb and promecarb, was performed by HPLC–UV using a LichroCART RP-18 column with gradient elution of methanol and 0.1 % acetic acid. The sorbent presented admicelles of CTAB on its surfaces and exhibited a sorption capacity of 180–18,600 mg kg−1 sorbent, which could be re-modified for at least five extraction cycles. The quantitative retention of target pesticides on the admicellar sorbent involved hydrophobic and π-cation interaction, while pesticides were eluted from the admicellar SPE column using only 750 μL of methanol. LODs and LOQs of the proposed method were 0.005–140 and 0.02–600 μg L−1, respectively. The analytes were effectively concentrated with the enrichment factors between 5 and 551. The developed on-line admicellar SPE-HPLC system was successfully applied to the determination of carbamate pesticides in ten environmental water samples from different sources. Recoveries of spiked samples at a concentration of 0.1–5 mg L−1 ranged from 77 to 111 %.
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Acknowledgments
The authors gratefully acknowledge financial support from the Royal Golden Jubilee (RGJ) Ph.D. program (Grant no. PHD/0082/2554). R. Burakham thanks the Thailand Research Fund (TRF) and Khon Kaen University for supporting the TRF Research Scholar (Grant no. RSA5580004). Materials Chemistry Research Center and the Center for Innovation in Chemistry (PERCH-CIC) are also acknowledged.
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Arnnok, P., Patdhanagul, N. & Burakham, R. An On-line Admicellar SPE-HPLC System Using CTAB-Modified Zeolite NaY as Sorbent for Determination of Carbamate Pesticides in Water. Chromatographia 78, 1327–1337 (2015). https://doi.org/10.1007/s10337-015-2965-0
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DOI: https://doi.org/10.1007/s10337-015-2965-0