Abstract
The occurrence and properties of halogenated organic compounds determined as adsorbable organic halogens (AOX) in Danish groundwaters were investigated. Preceded by a thorough evaluation of analytical procedures, a nation-wide survey of 145 wells was conducted. AOX was found in all wells but one, at levels from 1 µg Cl/l to 80 µg Cl/l. The occurrence of AOX was strongly correlated to the amount of organic carbon in the samples. Resampling of 6 wells and further characterization of these samples revealed, that the AOX consisted of organically bound chlorine, bromine and iodine of molecular weight distribution and polarity/pKa properties resembling those of the bulk mass of dissolved organic carbon. Except for a few locations, where inorganic iodide may have biased the AOX determinations, there was no indication of analytical artefacts. The ubiquitous occurrence of AOX in Danish groundwaters is not likely to be caused by man-made pollutants, but is attributed to naturally occurring halogenated, humic compounds.
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Grøn, C. (1991). Organic halogens in Danish groundwaters. In: Allard, B., Borén, H., Grimvall, A. (eds) Humic Substances in the Aquatic and Terrestrial Environment. Lecture Notes in Earth Sciences, vol 33. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0010501
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DOI: https://doi.org/10.1007/BFb0010501
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