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Journal of Soils and Sediments

, Volume 13, Issue 7, pp 1141–1149 | Cite as

Evaluation of soil analytical methods for the characterization of alkaline Technosols: I. Moisture content, pH, and electrical conductivity

  • Talitha C. Santini
  • Martin V. Fey
  • Michael N. Smirk
SOILS, SEC 2 • GLOBAL CHANGE, ENVIRON RISK ASSESS, SUSTAINABLE LAND USE • RESEARCH ARTICLE

Abstract

Purpose

Applying standard soil analytical methods to novel soil materials, such as tailings or soils with unusual properties, should be done with caution and with special consideration of potential interferents and possible pretreatments. The aim of this study was to investigate the effects of common variations in methods on calculated total moisture content, pH, and electrical conductivity (EC) of saline alkaline soil materials.

Materials and methods

Bauxite residue (an alkaline, saline–sodic Technosolic material) as well as two saline alkaline soils from coastal and lacustrine environments were dried under various temperatures and atmospheres, and then analyzed for pH and EC at various soil–solution ratios over time.

Results and discussion

Calculated moisture content of all samples increased with drying temperature. Dehydration of gypsum elevated calculated moisture content. Decreases in soil–solution ratio decreased suspension EC and pH in highly alkaline samples. The pH and EC of soil/water suspensions generally rose with equilibration time for bauxite residue; stable values were attained within 24–120 h. Atmospheric carbonation substantially decreased the pH of samples dried at lower temperatures.

Conclusions

Variations in temperature, time, and atmosphere during drying of highly alkaline and saline soil materials influenced calculated moisture content as well as chemical properties such as pH and EC. A drying temperature of 40 °C and drying to constant weight is recommended to minimize these effects. Soil–solution ratio, equilibration time, and sample preparation conditions influenced observed pH and EC, and should be standardized if attempting to compare results between studies.

Keywords

Analytical methods Bauxite residue Pedogenesis Sample preparation Tailings Technosols 

Abbreviations

BRM

Bauxite residue mud

BRMC

Carbonated bauxite residue mud

BRMG

Bauxite residue mud amended with 5 % wt gypsum

BRS

Bauxite residue sand

BRSG

Bauxite residue sand amended with 5 % wt gypsum

EC

Electrical conductivity

R

Room temperature

SAC

Saline alkaline clay

SAS

Saline alkaline sand

Temp

Temperature

Notes

Acknowledgments

The authors wish to thank the Western Australian Department of Environment and Conservation for site access to sample the saline alkaline soils and Alcoa of Australia Limited for supplying bauxite residue used in this study. Financial support for this work was provided by Alcoa of Australia Limited and BHP Billiton Worsley Alumina and by a Minerals and Energy Research Institute of Western Australia scholarship to the senior author.

Supplementary material

11368_2013_708_MOESM1_ESM.doc (242 kb)
ESM 1 DOC 242 kb

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Talitha C. Santini
    • 1
    • 2
  • Martin V. Fey
    • 1
  • Michael N. Smirk
    • 1
  1. 1.School of Earth and EnvironmentUniversity of Western AustraliaCrawleyAustralia
  2. 2.School of Geography and Earth SciencesMcMaster UniversityHamiltonCanada

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