Journal
ANALYTICA CHIMICA ACTA
Volume 559, Issue 2, Pages 200-206Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2005.11.079
Keywords
multiwalled carbon nanotubes; sulfonylurea herbicides; enrichment
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A new procedure was described with multiwalled carbon nanotubes as solid phase extraction packing material for the trace analysis of nicosulfuron, thifensulfuron and metsulfuron-methyl in water samples. The possible parameters influencing the enrichment were optimized and the optimal conditions were as followed: eluent, sample pH, flow rate and sample volume were acetonitrile containing 1% acetic acid, pH 3, 8 ML min(-1) and 500 mL, respectively. Under the optimal chromatographic separation and SPE conditions, the linear range, detection limit (S/N = 3) and precision (R.S.D., n = 6) were 0.04-10 ng mL(-1), 6.8 ng L-1 and 2.5% for nicosulfuron, 0.04-40 ng mL(-1), 11.2 ng L-1 and 5.4% for thifensulfuron, 0.02-20ng mL(-1), 5.9ng L-1, 2.1% for metsulfuron-methyl, respectively. The established method was well employed to determine nicosulfuron, thifensulfuron and metsulfuron-methyl in tap water, seawater, reservoir water and well water samples, and satisfactory results were obtained, the spiked recoveries in the range of 87.2-100.7%, 96.5-105.6% and 83.7-111.1% for them each, respectively. (c) 2005 Elsevier B.V. All rights reserved.
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