Description General description Alachlor ESA sodium salt is a metabolite of the preemergence herbicide, alachlor used to control annual grasses and broad-leaved weeds in corn and other crops. Application Alachlor ESA may be used as analytical reference standard for the determination of the analyte in ground water samples using high-performance liquid chromatography technique (HPLC). Refer to the product′s Certificate of Analysis for more information on a suitable instrument technique. Contact Technical Service for further support. Legal Information PESTANAL is a registered trademark of Sigma-Aldrich International GmbH