[pp.31-36]

Does Uptake of Polycyclic Aromatic Hydrocarbons (PAHs) Differ between Pine Needles and Mosses?

Yoshitaka OISHI （Shinshu University）

Abstract:
Vegetation is known to be useful for assessing air pollution by polycyclic aromatic hydrocarbons (PAHs). However, the PAH profiles in vegetation often differ among plant groups because of differences in plant structures. In this study, based on a comparison of PAH profiles between pine needles and mosses growing side by side, we examined the properties of these plants as bio-indicators of PAHs. Two pine needle and eight moss samples in total were collected from two sampling plots. Subsequently, 16 types of PAHs in these samples were analyzed by gas chromatography with high-resolution mass spectrometry. A comparison of the PAH profiles in these samples revealed that PAHs with higher molecular weights preferentially accumulated in mosses, whereas the total amount of PAHs was higher in pine needle samples. Given that the cuticle layer can be effective in accumulating PAHs with lower molecular weight while preventing the absorption of PAHs with higher molecular weight through the cells, the absence of waxy cuticle layers in mosses can explain their higher content of PAHs with higher molecular. Pine needles are likely to be very useful for the evaluation of PAHs with lower molecular weight in an atmospheric environment, whereas mosses are suitable for assessing PAHs with higher molecular weight.

Key Word:
pine needle, moss, polycyclic aromatic hydrocarbons, cuticle, leaf area

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