NDLI: Influence of the solvent on the gas chromatographic behaviour of urea herbicides

Content Provider	Springer Nature Link
Author	Berrada, H. Font, G. Moltó, J. C.
Copyright Year	2001
Abstract	Degradation products of chlorsulfuron, chlortoluron, diuron, fluometuron, isoproturon, linuron, metabenzthiazuron, metobromuron, and monuron formed in the gas chromatographic injector have been used for identification of the respective herbicides. Mass spectra of the derived compounds were obtained with a quadrupole mass spectrometric detector working in scan mode (20–450 amu). The compounds generated often depended on the solvent used for phenylurea herbicide injection (ethanol, methanol, dichloromethane, and acetonitrile). When methanol and ethanol were used as solvents the major products formed from phenylureas were carbamic acid esters. When acetonitrile or dichloromethane were used the main derivatives were phenylisocyanates. Chlorsulfuron and metabenzthiazuron, however, generated a triazine plus a phenylsulfonamide and a benzothiazolamine, respectively, irrespective of the solvent used. Linuron and diuron behaved similarly and gave degradation products with the same mass spectra. The thermal reactions occurred instantaneously in the injector block and were promoted by the high temperature selected (300°C).Detemination of the compounds derived from urea herbicides, by use of a 30 m BP10 column and a selected ion registering (SIR) program based on two or three ions, can be used for sensitive detection of the presence of urea herbicides in environmental extracts. With standards in methanol instrument detection limits ranged from 0.1 pg for chlorsulfuron (detected as 2-chlorobenzensulfonamide) to 1 pg for monuron and metobromuron (both detected as their carbamic acid methyl esters).RSD were below 9% at the 5 ng L−1 level. The response was linearly dependent on quantily (r>0.9986) in the 5 ng L−1 to 25 μg L−1 range. Unequivocal identification of some phenylurea herbicides was not always possible because some herbicides with similar structures, for example diuron and linuron, gave the same derivative.
Starting Page	253
Ending Page	262
Page Count	10
File Format	PDF
ISSN	00095893
Journal	Chromatographia
Volume Number	54
Issue Number	3-4
e-ISSN	16121112
Language	English
Publisher	Vieweg Verlag
Publisher Date	2001-01-01
Publisher Place	Wiesbaden
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gas chromatography-mass spectrometry Urea herbicides Thermal degradation Phenylisocyanates Analytical Chemistry Organic Chemistry Pharmacy Biochemistry Plant Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Analytical Chemistry Biochemistry Clinical Biochemistry

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