Field Methods for Determination of Soluble Salts and Percent Sodium from Extract for Identifying Dispersive Clay Soils

2009 ◽  
pp. 121-121-14
Author(s):  
CP Flanagan ◽  
GGS Holmgren
Keyword(s):  
Clay Soils ◽  
Soluble Salts ◽  
Field Methods

HALOMORPHISM OF SOME CLAY SOILS IN MANITOBA

1958 ◽  
Vol 38 (2) ◽  
pp. 105-115
Author(s):  
W. A. Ehrlich ◽  
R. E. Smith
Keyword(s):  
Exchangeable Cations ◽  
Water Soluble ◽  
Clay Soils ◽  
Exchangeable Sodium ◽  
Soluble Salts ◽  
Exchangeable Calcium ◽  
Causative Agents ◽  
Exchangeable Magnesium ◽  
Soluble Calcium

The analysis of the principal horizons of 11 halomorphic profiles was undertaken in an attempt to ascertain, chiefly, the kind and quantity of soluble salts and exchangeable cations assumed to be the main causative agents in the formation of solonetzic soils in Manitoba. The results showed that water-soluble sodium was equal to or greater in quantity than water-soluble calcium or water-soluble magnesium; that exchangeable calcium followed closely by exchangeable magnesium dominated the exchange complexes; and that exchangeable sodium in excess of 15 per cent of the exchangeable cations was found only in some horizons of the Solonchak, Solonetz and Solodized-Solonetz soils in the Chesterfield Association.

scholarly journals The Contribution of Radiocarbon Dating to New World Archaeology

Radiocarbon ◽  
2000 ◽  
Vol 42 (1) ◽  
pp. 1-21 ◽  
Author(s):  
R E Taylor
Keyword(s):  
New World ◽  
Critical Role ◽  
Great Success ◽  
Field Methods ◽  
Archaeological Data ◽  
Noticeable Improvement ◽  
The 1960S ◽  
The Relationship ◽  
New World Studies

When introduced almost five decades ago, radiocarbon (14C) dating provided New World archaeologists with a common chronometric scale that transcended the countless site-specific and regional schemes that had been developed by four generations of field researchers employing a wide array of criteria for distinguishing relative chronological phases. A topic of long standing interest in New World studies where 14C values have played an especially critical role is the temporal framework for the initial peopling of the New World. Other important issues where 14C results have been of particular importance include the origins and development of New World agriculture and the determination of the relationship between the western and Mayan calendars. It has been suggested that the great success of 14C was an important factor in redirecting the focus of American archaeological scholarship in the 1960s from chronology building to theory building, led to a noticeable improvement in US archaeological field methods, and provided a major catalyst that moved American archaeologists increasingly to direct attention to analytical and statistical approaches in the manipulation and evaluation of archaeological data.

Soil erodibility relationships on drumlin deposits in the Cape Caribou River area, Labrador

2000 ◽  
Vol 80 (4) ◽  
pp. 577-580 ◽  
Author(s):  
A. R. van Kesteren
Keyword(s):  
Mineral Soil ◽  
Soil Horizon ◽  
Soil Erodibility ◽  
Chi Square ◽  
Field Methods ◽  
Topographic Position ◽  
K Factor ◽  
Cross Tabulation ◽  
Log Linear

Universal soil loss equation (USLE) soil erodibility (K) factors were computed from drumlin soils in the Cape Caribou River area, Labrador. Soil erodibility variation was investigated, using Mann-Whitney and Kruskal-Wallis tests, for three stratifications: (i) topographic position (TOP), (ii) mineral soil horizon (HOR), and (iii) soil texture (TEX). Topographic position with two substrata, drumlin summits (SUM) and drumlin side slopes (SID), was not significant. Horizons A, B and C and textural classes loamy sands (LS), sandy loams (SL) and loams (L) were significant. A log linear likelihood chi-square (G2) model was applied to investigate relationships of HOR and TEX. Partitioning of the G2 statistic revealed both significant and non-significant cells in the cross tabulation. Some sampling considerations for the determination of K factors are discussed. It is concluded that accepted field methods could enhance K factor determination in Labrador forest soil environments. Key words: Soil erodibility, K factor, drumlins, Labrador

Studies on Soil Reaction. VII. An Electrodialysis Apparatus for the Determination of Replaceable Bases in Soils

1931 ◽  
Vol 21 (3) ◽  
pp. 484-492 ◽  
Author(s):  
J. K. Basu
Keyword(s):  
Simple Form ◽  
Water Soluble ◽  
Soil Reaction ◽  
Soluble Salts ◽  
Direct Titration ◽  
Influence Of Water ◽  
Electrodialysis Cell ◽  
The Individual

1. A simple form of two-compartment electrodialysis cell is described for the determination of replaceable bases in sets of six soils at a time. The determination requires little attention and the total replaceable bases are obtained by direct titration.2. The disturbing influence of water-soluble salts is examined and it is shown that the technique may be modified so as to exclude the kations of soluble salts from either the total bases as determined by direct titration of the dialysate or from the individual bases as determined by analysis.

SiBr4 – prediction and determination of crystal structures

2009 ◽  
Vol 65 (3) ◽  
pp. 342-349 ◽  
Author(s):  
Alexandra K. Wolf ◽  
Jürgen Glinnemann ◽  
Martin U. Schmidt ◽  
Jianwei Tong ◽  
Robert E. Dinnebier ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Powder Diffraction ◽  
Global Minimum ◽  
Lattice Energy ◽  
Field Methods ◽  
X Ray ◽  
Β Phase ◽  
Α Phase ◽  
Synchrotron Powder Diffraction

For SiBr4 no crystal structures have been reported yet. In this work the crystal structures of SiBr4 were predicted by global lattice-energy minimizations using force-field methods. Over an energy range of 5 kJ mol−1 above the global minimum ten possible structures were found. Two of these structures were experimentally determined from X-ray synchrotron powder diffraction data: The low-temperature β phase crystallizes in P21/c, the high-temperature α phase in Pa\overline{3}. Temperature-dependant X-ray powder diffraction shows that the phase transition occurs at 168 K.

Determination of the Index Properties of Clay Soils in the Presence of Nanoparticles

2016 ◽  
Author(s):  
James L. Hanson ◽  
Nazli Yesiller ◽  
Amro El Badawy ◽  
Ryne Mettler ◽  
Jared S. Stine
Keyword(s):  
Clay Soils ◽  
Index Properties
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