Analysis of metsulfuron-methyl in soil by liquid chromatography/tandem mass spectrometry. Application to a field dissipation study.
An analytical method is described for the extraction of metsulfuron-methyl from soil at sub-parts per billion levels (LOQ = 0.2 microgram kg(-1)). The herbicide was quantitatively determined and identified by ESI LC/MS/MS. The method has been applied to a field dissipation study in which metsulfuron-methyl was applied to spring barley at three dosage rates: 4, 8, and 16 g of active ingredient ha(-)(1). The results of 2 years are presented. The dissipation rate of metsulfuron-methyl in topsoil was very rapid, with a calculated half-life of 6.5 days. Laboratory mineralization studies with native soils in contrast to autoclaved soils indicated that microbial degradation of (14)C-labeled metsulfuron-methyl and (14)C-labeled 2-amino-4-methoxy-6-methyl-1,3,5-triazine in soil microcosms is an important factor for the complete degradation of metsulfuron-methyl in the field. However, the mineralization rate of the sulfonamide was much higher.
Bossi
R
R
National Environmental Research Institute, Frederiksborgvej 399, DK-4000 Roskilde, Denmark. rbo@dmu.dk
Seiden
P
P
Andersen
S M
SM
Jacobsen
C S
CS
Streibig
J C
JC
D001190:Arylsulfonates / Q000032:analysis* / Q000302:isolation & purification; D002853:Chromatography, Liquid; D004785:Environmental Pollutants; D006540:Herbicides / Q000032:analysis* / Q000302:isolation & purification; D013058:Mass Spectrometry; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D013997:Time Factors
D001190:Arylsulfonates; D004785:Environmental Pollutants; D006540:Herbicides; D010573:Pesticide Residues; D012987:Soil; C050296:metsulfuron methyl