Influence of Inorganic Salts on Soils Liquid and Plastic Limits

Ayininuola, G.M., Agbede, O.A.


This study focused on the influence of inorganic salts on soil liquid limit (LL) and plastic limit (PL). Sodium chloride, NaCl, potassium nitrate KNO3 and calcium sulphate, CaSO4 of various concentrations were added to two subsoils. Their liquid and plastic limits before and after contamination were monitored. Soil cation exchange capacity (CEC), exchangeable cations (sodium, Na+, potassium, K+, and calcium, Ca2+) and exchangeable anions (chloride, Cl-, nitrate, NO3, and sulphate, SO42-) were determined. A set of equations for predicting LL and PL, (with R2 = 0.908 to 0.990) at different levels of chemical interaction with time was developed using multiple regression analysis model. The results showed that both NaCl and KNO3 brought about reduction in LL and PL while CaSO4 addition led to increment in LL and PL. The predictive equations revealed that there is high tendency for the contaminated soils to regain their uncontaminated LL and PL values with time.


Cation exchange capacity, contamination, exchangeable cation, liquid limit, plastic limit, subsoils.


  1. Whitlow, R., Basic Soil Mechanics, first edition, Longman, Malaysia, 1997.
  2. Valsaraj, K.T., Elements of Environmental Engineer-ing–Thermodynamics and Kinetics, first edition, Lewis Pub., New York, 2000.
  3. Fakayode, S.O. and Olu-Owolabi, B.I., Heavy Metal Contamination of Roadside Top Soil in Osogbo, Nigeria; Its Relationship to Traffic Density and Proximity to Highways, Journal of Environmental Geology, Springer Verlag, 44(2), 2003, pp. 150-157.
  4. Gulec, N., Gunal, B., and Erler, A., Assessment of Soil and Water Contamination Around an Ash-disposal Site; A Case Study from the Seuitomer Coal-fired Power Plant in Western Turkey, Journal of Environmental Geology, Springer Verlag, 40(3), 2000, pp. 331-344.
  5. Govil, P., Reddy, G., and Krishna, A., Contamination of Soil due to Heavy Metals in the Patancheru Industrial Development Area, Andhra, India, Journal of Environmental Geology, Springer Verlag, 41(3 and 4), 2000, pp. 461-469.
  6. Barbour, S.L. and Fredlund, D.G., Mechanisms of Osmotic Flow and Volume Change in Clay Soils, Canadian Geotechnical Engineering Journal, NRC Canada, 26, 1989, pp. 551-562.
  7. Maio, C.D., Exposure of Bentonite to Salt Solution Osmotic and Mechanical Effects, Geotechnique, Thomas Telford Ltd, 46, 1996, pp. 695-707.
  8. Schmitz, R.M. and Van Paasen, L.A., The Decay of Liquid Limit of Clays with Increasing Salt Concentration, Lingeokring Newsletter, 9(1), 2003, pp. 10–14.
  9. Ohtsubo, M., Egashirak, K., Koumoto, T., and Bergado, D.T., Mineralogy and Chemistry and their Correlation with the Geotechnical Index Properties of Bangkok Clay Comparison with Ariake Clay, Journal of Japanese Geotechnical Society, Tokyo, 40(1), 2000, pp. 11–21.
  10. Torrance, J.K. and Ohtsubo, M., Ariake Bay Quick Clay a Comparison with the General Model, Journal of Soils and Foundation, Japanese Geotechnical Society, Tokyo, 35(1), 1995, pp. 11–19.
  11. Gleason, M.H., Daniel, D.E., and Eykholt, G.R., Calcium and Sodium Bentonite for Hydraulic Containment Applications, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 123, 1997, pp. 438-445. [CrossRef]
  12. Lee, J.M., Shackelford, C.D., Benson, C.H., Jo, H.Y., and Edil, T.B., Correlating Index Properties and Hydraulic Conductivity of Geosynthetic Clay Liners, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 131, 2005, pp. 1319-1329. [CrossRef]
  13. Park, J., Vipulanandan, C., Kim, J.W., and Oh, M.H., Effects of Surfactants and Electrolyte Solutions on the Properties of Soil, Journal of Environmental Geology, Springer Verlag, 49, 2006, pp. 977- 989. [CrossRef]
  14. Barbour, S.L. and Yang, N., A Review of the Interaction of Clay-brine Interactions on the Geotechnical Properties of Montmorillonitic Clayey Soils from Canada, Canadian Geotechnical Engineering Journal, NRC Canada, 30, 1993, pp. 920–934.
  15. Arasan, S. and Yetimoglu, T., Effect of Inorganic Salt Solutions on the Consistency Limit of Two Clays, Turkish Journal of Engineering Environmental Science, 32, 2003, pp. 1-9.
  16. BS 1377, Methods of London Test for Soils for Civil Engineering Purposes, 1991, BSI,
  17. OriginLab, Origin 8.0: A New Multi-sheet Workbook to Facilitate the Management of Data, Images, Graphs and Results,, 2007.
  18. Larsen, P.V., Module 3- Multiple Linear Regression, Retrieved April 10, 2008 from, 2008.

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