Comparison of Ion-Pair and Ion-Exchange Liquid Chromatography for Assay of Dalapon Products

Abstract

The accuracy of the AOAC official first action ion-pair liquid chromatographic assay for dalapon grasskiller products was studied by comparison with an independent ion-exchange liquid chromatographic method. No statistically significant difference in assay results was seen between the latter method and the AOAC official method for the assay of sodium salt, mixed sodium/magnesium salt, or the free acid forms of dalapon.