Journal
CHROMATOGRAPHIA
Volume 78, Issue 21-22, Pages 1327-1337Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10337-015-2965-0
Keywords
On-line SPE; Zeolite NaY; Admicellar sorbent; Surfactant; Carbamate
Funding
- Royal Golden Jubilee (RGJ) Ph.D. program [PHD/0082/2554]
- Thailand Research Fund (TRF) for TRF Research Scholar [RSA5580004]
- Khon Kaen University for TRF Research Scholar [RSA5580004]
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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 pi-cation interaction, while pesticides were eluted from the admicellar SPE column using only 750 mu L of methanol. LODs and LOQs of the proposed method were 0.005-140 and 0.02-600 mu g 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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