Ionen-chromatographische Bestimmung yon Chloracetat und Dichloracetat in Niederschlagswasserproben

Summary

Chlorinated hydrocarbons are released to the atmosphere by anthropogenic activities. To some extent they are decomposed in the troposphere by chemical reactions. Chlorinated acyl chlorides were found as degradation products in laboratory studies. Chloroacetate and dichloroacetate are supposed to be formed by hydrolysis of the intermediately produced chlorinated acyl chlorides. A multidimensional ion-chromatographic method was developed to separate traces of chloroacetate and dichloroacetate from the more than thousandfold excess of matrix ions. The limits of detection are 0.25 ng ml⁻¹ chloroacetate and 0.4 ng ml⁻¹ dichloroacetate. This technique is applied to the analysis of chloroacetate and dichloroacetate in precipitation samples. Mean concentrations of 1.5 ng ml⁻¹ chloroacetate and 1.6 ng ml⁻¹ dichloroacetate were found.