Trichloroacetic acid (TCA) is an atmospheric oxidation product substances, and has been identified in chlorinated Waste [ l o ] and of airborne C2-chlorocarbons and a widespread air pollutant. It drinking waters [ 11, 121. TCA was used as an agricultural was widelv used as a herbicide in the fifties and sixties, in some herbicide in the fifties and sixties 1131.countries, still today. It occurs in the foliage of conifers and deciduous trees of mountain forests in Germany, e.g. the Black Forest, the Northern Alps or the Erzgebirge. Quantitative determination in the ppb-range is achieved by gas chromatography using thick film capillary columns and electron-capture detection. The levels in spruce needles at two forest sites correlate with the extent of needle loss.The data are supportive of the hypothesis that TCA is causally involved in the induction of mountain forest decline.
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