Atmospheric inorganic contaminants and their distribution inside stem tissues of Fraxinus excelsior L

• Published in: Atmospheric environment (1994) Vol. 42; no. 6; pp. 1223 - 1238
• Main Authors: Catinon, Mickaël, Ayrault, Sophie, Daudin, Laurent, Sevin, Laure, Asta, Juliette, Tissut, Michel, Ravanel, Patrick
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.02.2008; Elsevier Science
• Subjects: Air pollution; Animal, plant and microbial ecology; Applied ecology; Biological and medical sciences; Biomonitoring; Ecotoxicology, biological effects of pollution; Fraxinus excelsior; Fundamental and applied biological sciences. Psychology; ICP-MS; Metals; PIXE; Terrestrial environment, soil, air; Tree barks; Air pollution; Biomonitoring; PIXE; ICP-MS; Tree barks; Metals; Calcium; Bark; Iron; Metal; Inorganic element; Biological monitoring; Stem; Dicotyledones; Angiospermae; Lead; Tree; Copper; Oleaceae; Fraxinus excelsior; Zinc; Heavy metal; Spermatophyta; Contaminant; Concentration distribution; Manganese
• ISSN: 1352-2310; 1873-2844
• DOI: 10.1016/j.atmosenv.2007.10.082

The elements present on and in 4-year-old stem of Fraxinus excelsior L. were analysed and estimated quantitatively. The superficial deposit on the bark is a complex mixture mainly composed of organic matter, mineral nutrients, clay and anthropogenic elements coming from the atmosphere. The elements present inside the stem tissues represent a total amount which is generally much higher than the superficial deposit. The distribution of elements such as Ca, K, Fe, Mn, Zn, Cu and Pb was shown by PIXE analysis in stem transversal cuttings, showing the presence of solid multimineral particles only inside the suber. A new strategy of mechanical tissues isolation on fresh stems was carried out in order to obtain high amounts of each tissue allowing an accurate ICP-MS analysis and estimation of >20 elements in each tissue. A concentration decreasing gradient was measured for each element from suber to wood and pith in good agreement with the PIXE results. In the dividing cells of the vascular cambium, elements concentrations were very high since the cell wall weight was minimal. When expressing the amounts of each element per bark area unit, the whole bark content was only twice the wood+pith content for the studied elements. All these results suggest that, in Fraxinus stems, the root uptake and xylem transport of elements are generally not intense enough to hide the atmospheric flux of mineral contaminants.