TRACE-ELEMENT PATTERNS IN LICHENS FOLLOWING URANIUM-MINE CLOSURES

被引：23

作者：

FAHSELT, D ^{[1
]}

WU, TW ^{[1
]}

MOTT, B ^{[1
]}

机构：

[1] UNIV WESTERN ONTARIO,DEPT EARTH SCI,LONDON,ON N6A 5B7,CANADA

来源：

BRYOLOGIST | 1995年 / 98卷 / 02期

关键词：

D O I：

10.2307/3243307

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Instrumental neutron activation analysis was used to determine trace elements in Cladina mitis (Sandst.) Hale & Culb. along transects extending from uranium mines at Elliot Lake and Agnew Lake in central Ontario, Canada. Levels of 11 elements were reported and the presence of uranium (U) was confirmed, although U concentrations were much less than in Cladina rangiferina 10 years earlier Among the elements identified in lichen thalli was Th, which occurred in higher concentrations than U. All trace elements, including the two radionuclides, were found in deteriorating thallus parts as well as living podetia, and five of these seem to have originated as airborne particulates from minesites. In spite of mine closures, levels of Th and U remained higher near sources of ore dust and there was little relationship between radionuclide concentrations in thallus and substrate.

引用

页码：228 / 234

页数：7