Element concentrations in surface soils of the Coconino Plateau, Grand Canyon region, Coconino County, Arizona

2016 ◽  
Author(s):  
Bradley S. Van Gosen
Keyword(s):  
Grand Canyon ◽  
Surface Soils ◽  
Element Concentrations

Total elements in forest soils affected by acid deposition in southern Quebec

1996 ◽  
Vol 76 (2) ◽  
pp. 165-171 ◽  
Author(s):  
Z. Q. Lin ◽  
W. H. Hendershot ◽  
P. H. Schuepp ◽  
G. G. Kennedy ◽  
P. Dutilleul
Keyword(s):  
Trace Elements ◽  
Acid Deposition ◽  
Forest Soils ◽  
Major And Trace Elements ◽  
Surface Soils ◽  
Mean Values ◽  
Podzolic Soils ◽  
Element Concentrations ◽  
The Mean ◽  
Element Enrichment

Major and trace elements (Al, As, Ba, Ca, Cd Co, Cr Cs, Cu Eu Fe, Hf, K, La, Lu, Mg, Mn, Na, Ni, Pb, Rb, Sb, Sc, Si, Sm, Sr, Ta, Tb, Th, Ti, U, V, Yb and Zn) in forest soils from three acid-deposition-affected locations in southern Quebec were investigated. Total element concentrations in the surface layer (0–20 cm) of the Podzolic soils were mostly well within the range of element concentrations in Podzols reported worldwide but showed higher mean values for most elements. The mean concentrations of elements (except Zn, at 124 μg g−1) were also generally comparable to the respective elemental baseline data established for Canadian soils. Element concentrations (μg g−1) of Cs (6.2) Sc (19 8) V (106) Rb (194) K (26 500) and Al (76 900) in the surface soils were significantly higher at the 940-m elevation than the concentrations from the sites at 650 and 770 m along the Roundtop Mountain slope, but Ca (1120) and Ni (4.4) were lowest at the 940-m elevation A similar trend with elevation was not observed at the other mountain location (White Peak). Enrichment-factor (EF) analysis showed significant element enrichment (EF ≥ 10) for Cd, Rb and Sb but impoverishment (EF ≤ 0.1) for Ca, Cu and Ni in topsoils. Key words: Major and trace elements, surface soils, acid deposition

Lateral resolution of the electron microbeam analysis

1978 ◽  
Vol 36 (1) ◽  
pp. 542-543
Author(s):  
H.J. Dudek
Keyword(s):  
Quantitative Analysis ◽  
Depth Resolution ◽  
Lateral Resolution ◽  
Cylindrical Particle ◽  
Correction Procedure ◽  
X Ray ◽  
Element Concentrations ◽  
Microbeam Analysis ◽  
The Matrix

The chemical inhomogenities in modern materials such as fibers, phases and inclusions, often have diameters in the region of one micrometer. Using electron microbeam analysis for the determination of the element concentrations one has to know the smallest possible diameter of such regions for a given accuracy of the quantitative analysis.In th is paper the correction procedure for the quantitative electron microbeam analysis is extended to a spacial problem to determine the smallest possible measurements of a cylindrical particle P of high D (depth resolution) and diameter L (lateral resolution) embeded in a matrix M and which has to be analysed quantitative with the accuracy q. The mathematical accounts lead to the following form of the characteristic x-ray intens ity of the element i of a particle P embeded in the matrix M in relation to the intensity of a standard S

Grand Canyon Rafting

2002 ◽  
Vol 5 (2) ◽  
pp. 13-14
Author(s):  
Sharon R. Stewart
Keyword(s):  
Grand Canyon

Physical and Hydrologic-Flow Properties of Fractures Las Vegas, Nevada—Zion Canyon, Utah—Grand Canyon, Arizona—Yucca Mountain, Nevada July 20–24, 1989

10.1029/ft385 ◽  
1989 ◽  
Author(s):  
Christopher C. Barton ◽  
Paul A. Hsieh ◽  
Jacques Angelier ◽  
Francoise Bergerat ◽  
Catherine Bouroz ◽  
...  
Keyword(s):  
Las Vegas ◽  
Grand Canyon ◽  
Yucca Mountain ◽  
Flow Properties

Grand Canyon is not so ancient

Nature ◽  
2014 ◽  
Author(s):  
Alexandra Witze
Keyword(s):  
Grand Canyon
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