Development and Application of an Off-Line SPE–LC–UV Methodology for the Determination of Penoxsulam in Aquatic Systems Adjacent to Rice Fields

摘要

An accurate, simple, reproducible and sensitive off-line SPE–LC–UV method was developed and validated for the determination of penoxsulam, a new triazolopyrimidine sulphonamide herbicide widely used in rice culture. The method was validated in terms of precision, linearity, detection limit, quantification limit and accuracy. The repeatability and intermediate precision of LC–UV conditions chosen were evaluated, with an RSD always bellow 10%. A limit of detection of 0.07 μg L−1 was achieved after SPE concentration. Recovery studies, performed in two different matrixes (run-off water from rice fields and brackish water), ranged from 93 to 105%. The methodology was successfully used to detect penoxsulam in aquatic systems, during an application period in rice fields.