Abstract
In this paper an analytical method is described for the microcoulometric determination of extractable organic halogen, especially chlorine, in surface waters and sediments. The minimum detectable amounts of chlorine are respectivelly 1.0 μg/l (ppb) in water and 0.5 mg/kg (ppm) in sediments. The results of a monitoring program in the river Rhine and several Dutch surface waters with respect to this parameter are presented. The results cover the period January 1973 to December 1975. In 1973, 1974 and 1975 the average daily loads of organic halogen calculated as chlorine in the river Rhine at Lobith were 3300, 3410 and 2050 kg, respectively. The parameter “Extractable Organic Chlorine” (EOCl) is suggested as a useful general indicator for chemical pollution in surface waters and in effluents from industrial plants.
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