Characterization of Particles Adsorbed on Plant Surfaces

Abstract Conifer needles act as filter for aerosol particles. A substantial part of the needle deposit is irreversibly adsorbed and hence superficial leaf contamination increases with age of the leaves. The permanently adsorbed particles are mainly due to combustion products, contain high concentrations of trace elements and, due to their small size, are able to enter the interior of spruce needles. For chemical analysis of leaf material, it is strongly recommended that the leaves should be washed for a short time in chloroform in order to distinguish between superficially adsorbed and biomass incorporated, i.e. physiologically active, compounds.

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