Occurrence of PCDD/F in dated lake sediments of the Black Forest, southwestern Germany

Article Abstract:

A replicated survey design of four remote but adjacent lakes in Black Forest, Germany, was used to trace historical trends in polychlorinated dibenzo-p-dioxins and dibenzofurans. PCDD/F were not recent contaminants, as evidenced by sizable amounts of the compounds in the sediments of one lake before the production of chlorophenols in the 1920s. Fossil fuels burned since industrialization are postulated to be a chief source of the contaminants. PCDD/F levels in sediments increased in the 1930s in one site and in the 1960s at three others. Waste incineration, combustion of fossil fuels and metal processing were identified as sources of the contaminants.

Pesticide and Other Agricultural Chemical Manufacturing, Agricultural chemicals, not elsewhere classified, Dioxin, Germany, History, Environmental aspects, Dioxins, Dibenzofurans, Black Forest

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Near-infrared reflectance spectroscopy of sediments: a potential method to infer the past acidity of lakes

Article Abstract:

The potential of near-infrared (near-IR) reflectance spectroscopy for recording an acidity-related fraction of lake sediments is investigated. Partial least squares regression is used to model the diatom analysis- inferred relationships between near-IR spectra of sediment cores and historical acidity values. The capacity of near-IR reflectance spectroscopy for the study of lake acidification history is demonstrated.

Usage, Evaluation, Near infrared spectroscopy, Acidity function

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