Determination of Mecoprop and Dichlorprop in Aqueous Soil Solutions by HPLC with DAD

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Abstract
A reverse phase high performance liquid chromatographic method was developed for the direct determination of mecoprop (MCPP) and dichlorprop (DCPP) in the presence of soil and peat constituents. Spiked aqueous soil or soil/peat samples were directly injected after centrifugation and filtration. The analytical sensitivity, 0.35 and 0.24 ng L-1, detection limit, 1.02 and 0.70 ng L-1, and precision, 1.28 and 0.80%, for MCPP and DCPP respectively, are very appropriate. The concentration ranges studied 0.0–94.2 ng L-1 for MCPP and 0.0–103.1 ng L-1 for DCPP are suitable for adsorption/desorption and mobility studies of these herbicides in soil. The two tests used to demonstrate the purity or otherwise of every chromatographic peak give valuable information.