Abstract
A high-performance liquid chromatographic method for the characterization of the alkyl and ethylene oxide distribution of ethoxylated alkylamines in pesticide formulations has been developed. The method involves the separation of the samples on two different columns: a cyano-modified silica column to determine the alkyl distribution and an amino-modified silica column to determine the ethylene oxide distribution. The detection of the ethoxylated amines was performed with a post-column ion-pair extraction system, using 9,10-dimethoxyanthracene-2-sulphonate as pairing-ion and fluorimetric detection. The detection system behaves linearly over two decades. The detection limit for the ethoxylated alkylamines was determined to be 25 ng. The method is suitable for the determination of ethoxylated amines in the presence of ethoxylated alkylphenols, alcohols and esters, because these latter compounds do not respond to the applied ion-pair extraction detection system.
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