منابع مشابه
Toxic Elements in Soils
MAMMALS and birds sometimes seek shelter or nesting sites in the ground. Many of them scarcely affect the soil as a medium for plant growth. A notable exception is the soil-dwelling rodents. Although their acreweight is usually only about a few pounds even in the uncultivated land, their soil transporting activities sometimes are considerable. In building their tunnels and nests, they transport...
متن کاملPrimitive Elements in the Matroid-minor Hopf Algebra
We introduce the matroid-minor coalgebra C, which has labeled matroids as distinguished basis, and coproduct given by splitting a matroid into a submatroid and complementary contraction all possible ways. We introduce two new bases for C; the first of these is is related to the distinguished basis by Möbius inversion over the rank-preserving weak order on matroids, the second by Möbius inversio...
متن کاملLibs Analysis of Minor Elements in Geologic Samples
BWQC-1, a coarse-grained basaltic andesite, Westfield, MA. Each spectral channel has been normalized to the total emission intensity of its spectral region. LIBS ANALYSIS OF MINOR ELEMENTS IN GEOLOGIC SAMPLES. J. M. Tucker, M. D. Dyar, S. M. Clegg, M. W. Schaefer, R. C. Wiens, J. E. Barefield II. Department of Astronomy, Amherst College, Amherst, MA 01002, [email protected], Department of A...
متن کاملMigration of trace elements from pyrite tailings in carbonate soils.
In the carbonate soils contaminated by a toxic spill from a pyrite mine (Aznalcóllar, southern Spain), a study was made of a thin layer (thickness = 4 mm) of polluted soil located between the pyrite tailings and the underlying soil. This layer, reddish-yellow in color due to a high Fe content, formed when sulfates (from the oxidation of sulfides) infiltrated the soil, causing acidification (to ...
متن کاملBaseline Concentrations of 15 Trace Elements in Florida Surface Soils
The objective of this study was to establish baseline concentrations for 15 potentially toxic elements (Ag, As, Ba, Be, Cd, Cr, Cu, Hg, Mn, Mo, Ni, Pb, Sb, Se, and Zn) based on 448 representative Florida surface soils using microwave assisted HNOrHCI-HF digestion. Baseline concentrations of those elements were (mg kg-I): Ag 0.072.50, As 0.02-7.01, Ba 1.67-112, Be 0.04-4.15, Cd 6-0.33, Cr 0.89-8...
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ژورنال
عنوان ژورنال: Nature
سال: 1960
ISSN: 0028-0836,1476-4687
DOI: 10.1038/187629b0