Seasonal Variations in Interstitial Water Transuranium Element Concentrations

2000 ◽  
Vol 34 (20) ◽  
pp. 4273-4277 ◽  
Author(s):  
Miranda J. Keith-Roach ◽  
J. Philip Day ◽  
L. Keith Fifield ◽  
Nick D. Bryan ◽  
Francis R. Livens
Keyword(s):  
Seasonal Variations ◽  
Interstitial Water ◽  
Transuranium Element ◽  
Element Concentrations

Selected element concentrations in the post-glacial sediments of Thunder Bay, Lake Superior: distribution and methods of analyses

1977 ◽  
Vol 14 (5) ◽  
pp. 1054-1061 ◽  
Author(s):  
John S. Mothersill
Keyword(s):  
Organic Matter ◽  
Reliable Method ◽  
Interstitial Water ◽  
Lake Superior ◽  
Sedimentary Sequence ◽  
Aqua Regia ◽  
Glacial Sediments ◽  
Element Concentrations ◽  
Thunder Bay ◽  
Fe And Mn

Aqua regia digestion is a reliable method of extracting elements present in sediments from adsorbed positions, from solution in the interstitial water, and from precipitated oxides, hydroxides, and sulphides. The aqua regia method, when used in combination with the HF–HNO3–HClO4 method for total element extraction from the sediments, provides valuable information on the relative amounts of Fe, Mn, Ni, Cu, Co, Cr, and Zn which are able to migrate in the upper part of the sedimentary sequence. The distribution of Fe and Mn are strongly controlled by pH and Eh. Ni, Cu, Ci, Cr, and Zn are controlled by adsorption to Fe hydroxides, organic matter, and MnO2 as well as Eh and pH with Cu, Co, and Zn showing a stronger correlation with MnO2 than with organic matter and Fe hydroxides.

Are there seasonal variations of trace element concentrations (Cd, Pb, Zn) in wood of Fagus trees in Germany?

Vegetatio ◽  
1992 ◽  
Vol 101 (1) ◽  
pp. 55-63 ◽  
Author(s):  
J. Hagemeyer ◽  
A. L�lfsmann ◽  
M. Perk ◽  
S. -W. Breckle
Keyword(s):  
Trace Element ◽  
Seasonal Variations ◽  
Element Concentrations

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

Seasonal variations in AADSAS applicants

1985 ◽  
Vol 49 (6) ◽  
pp. 445-447
Author(s):  
E Solomon ◽  
D Stoll
Keyword(s):  
Seasonal Variations

Seasonal variations in catecholamine output

1968 ◽  
Author(s):  
Gunn Johansson ◽  
Marianne Frankenhaeuser ◽  
William W. Lambert
Keyword(s):  
Seasonal Variations
Sign in / Sign up

Export Citation Format

Share Document