Chromatographic Investigations of the Behaviour of Dichlobenil and 2,4,5-T in Water During Slow Sand Filtration

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Abstract
The behavior of the herbicides dichlobenil and 2,4,5-T during slow sand filtration of surface water was investigated. Slow sand filtration was applied to artificial groundwater recharging of Ruhr [West Germany] water. The herbicides were added into the Ruhr water supply of a pilot plant. The quantitative determination of dichlobenil, 2,4,5-T and their metabolites was performed by high-pressure liquid chromatography. Sample preparation an analysis were simplified by direct injection of the filtered water sample into a liquid chromatograph or by using a column switching system consisting of a short precolumn as enrichment column and an analytical column; this was used when working in the ppb range. With dichlobenil a partial elimination by adsorption and degradation was observed. The elimination rate of 2,4,5-T was very low, only .apprx. 10% of the added amount; no degradation product was observed.