Electron paramagnetic resonance (EPR) investigations of lichens - 1: effects of air pollution

被引：20

作者：

Jezierski, A ^{[1
]}

Bylinska, E

Seaward, MRD

机构：

[1] Univ Wroclaw, Fac Chem, PL-50383 Wroclaw, Poland

[2] Univ Wroclaw, Inst Bot, PL-50328 Wroclaw, Poland

[3] Univ Bradford, Dept Environm Sci, Bradford BD7 1DP, W Yorkshire, England

来源：

ATMOSPHERIC ENVIRONMENT | 1999年 / 33卷 / 28期

关键词：

EPR; lichen; air pollution monitoring; biomonitoring; iminoxy radical;

D O I：

10.1016/S1352-2310(99)00258-7

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Electron paramagnetic resonance (EPR) investigations were carried out on more than 800 samples of lichens from Lower Silesia, southwest Poland. A statistically confirmed correlation between annual average concentration of sulphur dioxide in the atmosphere and concentration of semiquinone radicals in Hypogymnia physodes thalli was found. Similar results were obtained for Umbilicaria species from the Karkonosze Mountains. Distribution of semiquinone radicals in lichen thalli was also investigated. The action of nitrogen dioxide on Umbilicaria species resulted in the synthesis of iminoxy radicals in the thalli. The intensification of the semiquinone free radical production in lichen thalli from atmospherically polluted environments and the degradation of lichen acids to beta-diketone compounds would appear to be parallel processes. The properties of the iminoxyls derived from beta-diketones in the lichen matrix (anisotropic spectra at room temperature) and in organic solutions after extraction procedure were also examined by EPR. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：4629 / 4635

页数：7

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[21] MOLECULAR AND QUANTITATIVE ASPECTS OF THE CHEMISTRY OF FULVIC-ACID AND ITS INTERACTIONS WITH METAL-IONS AND ORGANIC-CHEMICALS .1. THE ELECTRON-SPIN-RESONANCE APPROACH [J].