@conference{
author = "Grahovac, Nada and Suturović, Z. and Sekulić, Petar and Šunjka, Dragana and Jakšić, Snežana",
year = "2012",
abstract = "Sulfonylurea compounds are characterized by high herbicidal activity allowing
low-dose rates for the control of many grasses and broadleaf weeds in the
agriculture of crops. This feature means, however, that under persistent
conditions (e.g. high pH of soil, little rainfall and poor microbial activity)
remaining low concentrations of these analytes can still affect the growth of
susceptible plants. Hence, in order to control carry-over from one growing ~
season to the next, productive sensitive and selective methods are required for
the determination of residues of sulfonylurea herbicides In soil.
A screening method has been developed for the determination of sulfonylurea
in various types of soils. Methodology is based on the use of microwave
assisted solvent extraction (MASE) for fast and efficient extraction of the
analytes from the soils and reversed-phase liquid chromatography (LC) with
UV detection at 230 nm for the instrumental analysis of uncleaned extracts.
Four types of soils, including sand and clay with a range in organic matter
content of 1.45-4.39% and seven sulfonylurea herbicides (nicosulfuron,
tritosulfuron, tribenuron-methyl, prosulfuron, rimsulfuron, oxasulfuron,
triasulfuron) were selected as matrices and analytes, respectively. The method
developed included the selection of suitable MASE and LC—UV conditions.
MASE. conditions were established providing efficient extraction without
degradation of the analytes, furthermore selectivity can be enhanced by ~
limiting the coextraction of interferences. Selected MASE conditions, including
mixture dichloromethane-acetonitrile as the extraction solvent, provided a
complete extraction of the analytes from soil samples. Method validation was
performed by analysing freshly spiked soil samples with sulfonylurea and
samples with aged residues at levels between 20 and 50 mg/ kg. Depending
on the spiked level and the type of spiked sample recoveries were obtained
between 70—-100% with relative standard deviations between 5 and 10%.
Evaluation of the data set with principal component analysis revealed that the
parameters increase of organic matter content of the soil samples and aged
residues negatively effect the recovery of the analytes. The benefits of MASE,
shorter extraction times, reduction of solvent consumption, improved selectivity
and the possibility of processing 24 samples simultaneously, make this
technique a good alternative to conventional extraction procedures.",
publisher = "Beograd : Društvo za zaštitu bilja Srbije",
journal = "Book of Abstracts, Annual MGPR Meeting 2012 and International Conference on Food and Health Safety: Moving Towards a Sustainable Agriculture, 11-12 October 2012, Belgrade, Serbia",
title = "Microwave assisted solvent extraction and reversed phase liquid chromatography with diode array detection for screening sulfonylurea herbicides in soil samples",
pages = "76-76",
url = "https://hdl.handle.net/21.15107/rcub_fiver_3316"
}